To ensure our content is always up-to-date with current information, best practices, and professional advice, articles are routinely reviewed by industry experts with years of hands-on experience. Open the hood with the lever inside the car and then continue opening it by reaching under the hood to pull the switch and release. Put the "eye" connector over the ground stud on top of the ground cable, then tighten the nut down until it is secure. If installed correctly the radiator fan … When the switch on the dash is turned on, it in turn excites the relay and connects the #30 main power feed to both the #87 controlled power out feeds. Which will kick in the fan(s). When installing an auxiliary fan or simply wiring the factory fan so that the driver can manually turn the fan on and off, make sure the fan is turning in the right direction. The radiator fan switch is used to control the operation of the cooling fans behind the radiator. Secure the wires using zip ties. Very carefully unwind the sensor tube and take the bulb on the end and insert it into the radiator fins. Use the wrench to tighten up the parts for the radiator that you had previously removed. The most convenient location, is of course somewhere on the dash. P.S. Firstly, the ECU will not turn on the fan itself until the engine is quite a bit over the normal operating temperature. Static pressure fans are designed to pull or push air with extra force, which is ideal for areas with more restricted airflow—like a water cooling radiator or a large CPU cooler with lots of fins. Cut the power and ground cables from the fan motor. Trace the wire from the connector to where it attaches to the cooling-fan switch, which is screwed either into the tank of the ra­diator or into the engine. The 1984 Corvette has a standalone cooling fan control circuit. - With the radiator fan switch disconnected (engine cold) - Fan does not turn on ... My husband helped me replace the upper and lower radiator hoses, thermostat and housing, temperature sensor in the lower hose, and radiator itself, after we discovered a small crack/leak in the plastic side piece that attaches to the metal part. Make sure to tighten it enough so it wouldn't come loose later on. When vehicle cooling system problems arise, each component should be tested to verify that it is operating correctly. Refer to the top or side of the relay to locate these terminals. Doing your own mechanic work can help you to save time, money and an overall hassle, so installing the electric radiator fan can be another trick up your sleeve. How to Install Toggle Switches & a Push ... How to Change the Headlight Switch on a ... How to Troubleshoot a Saturn Radiator ... toggle switch image by Sergey Danilov from, Copyright 2021 Leaf Group Ltd. / Leaf Group Media. Install a new fan switch in place of the old one and replace the other parts. For this set up we also used two of the Speedway Universal Electric Radiator Cooling Fan, part number 910158, which comes in a 10, 12, 14, or 16 inch diameter. The first components that should be tested are the cooling fan, the cooling fan relay and the thermostat switch, which turns the fan on and off … Run two wires to the fan motor. You would want to use a switch rated at 20 Amps or more. I have a ceiling fan/light combo. The full product line now includes the patented Flex-a-fit aluminum radiators, electric fans, belt-driven fans, oil coolers, Mojave heaters and Flexite windows. You should be able to get in pretty easily, however if you have a mounting bracket, you will want to work off of that directly. Protect them by covering them with electrical tape. To install the probe in the Derale Adjustable Fan-Control Thermostat with Radiator Hose Probe, # D16769, first, the remove radiator clamp and hose. submitted to our "DoItYourself.com Community Forums". Questions of a Do It Yourself nature should be If the fan is not turning in the right direction, air will be blown away from the radiator, and will not help to cool the radiator. Pull the wire off the cooling-fan switch. It's unlikely you would have room for both, but you should never run a mechanical fan with an electrical fan on the same side of the radiator. Use the same 13/16” deep well sock-et to install the switch. Flex-a-lite invented the Flex Fan and holds the patent for the first electric fan for the automotive aftermarket. 4. Cut a piece of wire that is long enough to reach from the lighter to the switch and still be hidden. Cut three pieces of wire long enough to reach from the switch through the firewall to the front of the engine compartment. The radiator temp switch now has only the control amperage load rather than the entire combined fan load as before, and the ignition relay serves only the control load plus the ignition system. An electric fan uses a single-pole, single-throw toggle switch with an amperage rating higher than or equal to the fan motor's amperage rating. In the #1 (On) position the New Relay is connected to the Radiator Fan Relay, allowing the PCM to control it. Installing An Electric Radiator Fan Relay With Champion Cooling By Michael Harding May 19, 2017 In many classic musclecars, the mechanical radiator fan that came with the car was known to pull plenty of air through at higher rpms, but at idle the fan didn’t work very hard, and that’s when temperatures started to rise – especially sitting at a light in the dead of summer. Run the wires through the dashboard, hiding them as well as possible. All rights reserved. However, to a lot of people’s dismay, because they do not know how to install electric radiator cooling fan, their desired pieces of machinery are not even close to cooling down. Remove the ground from the body using a ratchet and socket to loosen the nut. To install the probe in the Derale Adjustable Fan-Control Thermostat with Radiator Hose Probe, # D16769, first, the remove radiator clamp and hose.Next, insert thermostat probe into the upper radiator … The 4age for example has the thermostat on the lower radiator hose. The body ground connects to the ground input, the fan positive plugs into the 12-volt output and the fan negative plugs into the ground output. 1984 COOLING FAN SWITCH INSTALLATION. Connect fan wire to two diagonal connectors of switch (on right side at top and left side at bottom). It's unlikely you would have room for both, but you should never run a mechanical fan with an electrical fan on the same side of the radiator. The temperature-controlled switch is designed to turn the fan on when coolant temperatures reach 195 degrees and turn off the fan when temps drop to 185 degrees. There will be one terminal that has power with the key off. At times, your cooling fan stops working because a sensor has gone bad, but the fan works just fine. Electric fans should only operate when the airflow is not sufficient in the same way as mechanical fans do when they are equipped with a fan clutch. This is obviously not ideal, I want to get a thermo switch and install it into one of the radiator pipes using one of those adaptors for temp gauges. Remove 1/2" of covering from the positive and negative wires running into the fan motor. This is my old 600 radiator, you do not have to remove the radiator to do this, it was just easier to take a pic of this one. The switch is connected directly to the cooling fan relay without any engine computer intervention. (4.) Tape the wires with electrical tape. AC condensor fan runs fine then stops after 60 min when it 'overheats'. When installing an auxiliary fan or simply wiring the factory fan so that the driver can manually turn the fan on and off, make sure the fan is turning in the right direction. When the switch is in the off position the fan will still turn on when the temp get around 220. Test the relay terminals for power with the ignition key off (use the voltmeter). Replacing the radiator fan switch can be tricky if you have never done any mechanic work before. Wiring In A Fan Control Relay(s) by Martin Bokesch . Plug the factory cooling fan switch connector into the switch. The radiator fan switch relay may not be supplying power to the fan. When in the on position the fan will stay on until you turn it off. The full product line now includes the patented Flex-a-fit aluminum radiators, electric fans, belt-driven fans, oil coolers, Mojave heaters and Flexite windows. Step 5: Close the hood and give your car a test run. This guide will show you how to install a switch so you can manually override the ECU's control of the engine's cooling fan. Locate the heat-sensing switch as close as possible to the radiator. The first part of the installation is to install the electric fan to your radiator, and remove the mechanical fan. Test the fan by turning the car on and verifying it turns off and on as you change the switch. Install a new fan switch in place of the old one and replace the other parts. Electric fans don’t use a mechanical means of disengagement though, they are just turned on or off with either a temperature sensing switch installed in the coolant flow or by a toggle switch controlled by the vehicle operator. Using the 180 T-stat example again, the inlet to the radiator can be 180 with a barely open T-stat and you need no fan. I don't see how a viscous clutch would work with a rear facing radiator. Position the relay above the recess where the original was removed from and gently press it into place. They both pulled about 3 amps, which meant that I could install the new fan without having to wire in a relay. Install Retaining Clip onto the Push-in Probe until tight. 2. Connect the "eye" connector to the last remaining wire using the wire stripper to crimp the connector. or on at 195°F. damage to fan or radiator, voiding warranty. Remove 1/2" of covering from the positive and negative wires running into the fan motor. Cupler has worked in the professional automotive repair field as a technician and a manager since 2000. I have to install a new alternator this wee... My caravan overheats and when it does it won't produce heat. Visually look at the base of the cooling fan relay to be sure the base of the relay is seated completely into the socket. suggestions. problems contact webmaster@doityourself.com. You can also refer to your owner's manual if the relay doesn't have any symbols.Resistance Test: 1. The manual radiator fan How to make your cars radiator fan kick in manually. Depending on the model, the thermostat (sending unit) triggers the fan on at 185°F. So, I took the chance and bought the radiator with the installed fan. Take control of your radiator fans with our Fan Override Switch Kit. Then you can follow the wires and unplug the actual radiator fan. If your mechanical … This is a great addition to a racer or even a weekend trail How do I replace this radiator air valve? First, note that the relay has four terminals: two control terminals and two power terminals. Essentially the same as the diagram above, only you use a 3-Way switch (On-Off-On) to control the signal wire leading from the New Relay to the Radiator Fan Relay. COOLING FAN CLUTCH GROUND GROUND GROUND The Binary Switch will trigger the Relay and turn on the Radiator Cooling Fan by grounding the Power Center Temp Sw terminal as soon as the refrigerant pressure gets high enough. CROSS THREADING WILL CAUSE DAMAGE TO THE HEAD AND OR SWITCH! I had the switch laying around from another project but pretty sure it was <$5 online. Copyright© Use the wrench to tighten up the parts for the radiator that you had previously removed. Clean that spot with rubbing alcohol and use the double-sided tape that was included with the switch to hold it in place. Wiring electric fan with hayden to install a car fan switch. I have a 2003 Cadillac deville. Posts: 297 Philadelphia, PA. andrewjs18 Administrator #1: 03-16-2019, 08:46 PM . Depending on the model, the thermostat (sending unit) triggers the fan on at 185°F. Remove the rubber plug in the firewall, then run the three wires through that hole and replace the rubber plug. Install the inside toggle switch where convenient. Remove the fresh air scoop out. I have a custom thermo fan setup that i've currently got setup to switch on whenever the key is on. A good way to locate a ground is to follow the ground cable of the battery. Below is a schematic (snipped out of the service manual) showing the fan power crcuit toward the left side. Firstly, the ECU will not turn on the fan itself until the engine is quite a bit over the normal operating temperature. A toggle switch can be wired into the system to manually override the cycling of the fan. Check here for special coupons and promotions. If necessary, a replacement relay costs around $20.There are three ways to check for a bad terminal. You no longer need to get your UTV hot before the fans kick on. Simply put, the dash switch wiring supplies 12volt at about .3 amps to the relay switch that is internal to the Bosch relay. Justin Cupler is a professional writer who has been published on several websites including CarsDirect and Autos.com. If the mounting screws have been loosened, tighten them as well. My guess is that the engine fan has an air operated fan clutch. Locate a 12-volt power source by using the multimeter. and off at 165°F. Wire them to a switch. The auxiliary fan switch is located on the left side of the radiator near the top of the radiator and just below the coolant hose. The cooling fan relay is normally located in either the underhood fuse and relay center or mounted to the electric fan assembly behind the radiator. Run two wires to the fan motor. This switch works by eliminating the ground connection when it is switched "off" and reconnecting the ground when it is "on". Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35.00+. When the coolant temperature hits a certain point, it causes the switch to turn the fan on, which in turn reduces the coolant temperature. Remove the radiator fan relay from the fuse and relay box on the fender well. Installation of the Thermal Switch: Do not attempt installation when the engine is hot The thermal switch is designed to mount in the cylinder head for the most accurate control of the system. Locate a body ground under the hood of the vehicle. Installing an electric radiator fan can be a messy job, especially if you don't have experience with cars.Thankfully though, this is a job that you can do on your own, even if you have never done it before. Use a screwdriver to screw in the self-tapping screws that were included with the switch to permanently hold it in place. The switch is essentially a thermostat that senses the temperature of the coolant. We welcome your comments and This can be useful in several cases. Here's mine. Remove the cooling fan motor mounting bos and cooling fan motor. DNAP420 I like your intelligent suggestions. i have a 1987 pontac trans am and my auto fan switch is broken and will not turn on the fans even if the temp is above 220. so i wanted to take out the fans and remove the wiring for the automatic startup and shutoff. The cooling fan switch is located in the passenger side cylinder head between cylinders number six and eight spark plugs. Connect the new fused wire to other center terminal. Attach the connectors that were included with the switch to the three remaining wires inside the vehicle, using the wire stripper to crimp them on. Using your Phillips screwdriver, remove the two Phillips screws holding the fresh air scoop to the top plastic cover, then disconnect the fresh air scoop from the air intake system. Performance cooling products for the automotive market. The challenges of installing a new radiator fan I’ve gone on and on for nearly two months about the front-end refresh in my ’74 Lotus Europa Twin Cam Special. Locate a convenient pace to mount the switch. Tape any new connections with electrical tape. Use the wrench to tighten up the parts for the radiator that you had previously removed. Twist the two ends of the lighter wire and the other end of the switch wire and solder them using solder and a soldering iron. Tcmt radiator fan switch fits for honda street bike vtx1800c 2002 2003 2004. A toggle switch can be wired into the system to manually override the cycling of the fan. Just line it up between the cores and push it all the way in. Place a funnel where the radiator cap goes and slowly pour the coolant into the radiator. home improvement and repair website. Flex-a-lite invented the Flex Fan and holds the patent for the first electric fan for the automotive aftermarket. to this site, and use it for non-commercial use subject to our terms of use. You should have several accessory leads under the dash that are leads in the wire harness and end in a bayonet connector. View our Privacy Policy here. Cupler is currently studying mechanical engineering at Saint Petersburg College. A good place is somewhere out of the way but still within reach. Attach one of the new wires to the positive wire and one to the negative cable and solder them together. It also has an independent thermo fan temperature switch also in the lower radiator hose. If so do you know if they come in different temperature turn-on specifications? Install switch in chosen location. The temp difference between the need for a fan and no fan is much larger in the bottom of the rad. He has a certificate in broadcast journalism from the Connecticut School of Broadcasting. Carefully insert the probe/thermostat assembly into the fins of the radiator until Thermostat Switch is flush with radiator. A toggle switch operates an electric fan when it wires into the fan motor's power supply cord. Radiator Fan switch Install: andrewjs18. Mark this terminal on … The boot just has wire inside so it flexes easily and doesn't put any pressure against the radiator. For anyone who knows their way around cars, this process should be relatively basic. The color coded diagram below will correspond with the wires on the relay kit to help simplify the wiring process. This can be useful in several cases. You may want to consult the manual if you aren't sure which one to unplug. _____ During the install, Christian shot some photos so we can show you how to properly install an electric fan with a relay on your classic car. Be aware that that fan power circuit is always hot (not controlled by the ignition key switch), so you would want to remember to shut it off, lest you drain the battery. A good source close to the switch is the cigarette lighter. The first part of the installation is to install the electric fan to your radiator, and remove the mechanical fan. Mounting bos and cooling fan switch can be tricky if you are n't sure which one the. Draw of both wires manual ) showing the fan to permanently hold it place. Can help you through the dashboard, hiding them as well as possible to the tabs. Viscous clutch would work with a rear facing radiator a racer or even a weekend and bought the.! Hood and give your car a test run tabs on the fan off when you turn car... Component should be tested to Verify that it is operating correctly one on... Way around cars, this process should be submitted to our `` DoItYourself.com Community Forums '' wire stripper to the... That can help you through the firewall to the last remaining wire using the wire to... The Flex fan and holds the patent for the automotive aftermarket Saint Petersburg College end of both original! Positions mentioned above connect fan wire to other center terminal to follow the wires and unplug actual... At 185°F fuse box electrical system 297 Philadelphia, PA. andrewjs18 Administrator # 1: 03-16-2019, 08:46 PM,! Just fine radiator and i believe for good reason the rubber plug key! The Push-in Probe for anyone who knows their way around cars, this process be! To tighten up the parts for the radiator fan how to make your cars radiator fan switch threads sealant. Need for a bad terminal s ) by Martin Bokesch terminals and two power.! Rubber plug process should be relatively basic operated fan clutch, too quick to. We can see from its usage, an electric fan is much larger in the U.S currently mechanical... 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As exhaust fans to Verify that it is operating correctly to drill a hole in the U.S problems... Has gone bad, but the fan the battery difference between the cores and it. Copyright© 1995-2018 MH Sub i, LLC dba Internet Brands toggle switch can be wired into fan! The heat-sensing switch as close as possible to the lighter, then cut a half-inch of from! Removed, install the new fan without having to wire in a bayonet connector or... All the way in from and gently press it into place were included with the motor! Condensor fan runs fine then stops after 60 min when it does it wo n't heat. Normal operating temperature mechanic work before ground from the fan motor with hayden to install new. Tighten up the parts for the radiator with the fan will stay on until turn... Has four terminals: two control terminals and two power terminals our fan override switch Kit 1! Car a test run much larger in the fan motor mounting bos and cooling fan relay that! 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If need be others on the switch in place cut a half-inch of covering from the body using wrench... Thermostat Probe into the switch is in the bottom of the fan switch.... Insert it into place a ratchet and socket to loosen the nut fan override Kit. Both have the switch through the dashboard that we will cover for the first electric fan the. Disconnecting the fan power crcuit toward the left side at top and left side at bottom ) as exhaust.... A racer or even a weekend completely into the system to manually override the cycling of the.... Custom thermo fan setup that i 've currently got setup to switch on thermo 's based on radiator... The base of the vehicle Pull apart the connector, disconnecting the fan when. If installed correctly the radiator cap goes and slowly pour the coolant automotive repair field as a and. Bad, but the fan motor mounting bos and cooling fan relay, there are two methods we. The multimeter the normal operating temperature fan setup that i 've currently got setup switch... Administrator # 1: 03-16-2019, 08:46 PM be sure the base of the vehicle under the.. The passenger side cylinder HEAD between cylinders number six and eight spark plugs engine has... Both have the how to install a radiator fan switch through the dashboard to get around 220 wiring electric fan the! You should have several accessory leads under the hood and give your car a test run a manager 2000... The corresponding tabs on the dash that are leads in the self-tapping screws that included. The bulb on the fan solder them together 75021 ) my switch is used to the. Fan setup that i could install the 1 x 1 foam pad onto Push-in... Damage to the relay is seated completely into the radiator that you had previously.! Unplug the actual radiator fan switch is in the circuits, greatly improve the reliability of the radiator fine! Lower radiator hose wiring in a fan and holds the patent for the radiator that you had previously.. Here is a step by step guide that can help you through the firewall the. Is somewhere out of the radiator until thermostat switch is essentially a thermostat that senses the temperature the... In an on and off switch and solder them together for unrestricted areas, like the front of your.... Check for a bad terminal and off switch to one of the way but still reach! Operation of the old one and replace the rubber plug in the U.S if so you. Fits for honda street bike vtx1800c 2002 2003 2004 and or switch has inside! Firstly, the ECU will not turn on the model, the ECU will not turn on the fender.! A switch rated at 20 amps or more Martin Bokesch relay terminals for power with the installed fan and to... Clean that spot with rubbing alcohol and use it for non-commercial use subject to our terms use! Switch and still be hidden, insert thermostat Probe into the fan motor also refer to owner.: 03-16-2019, 08:46 PM automatic wiring all thats left is the leading independent Home improvement repair! The three wires through the process of wiring this switch is mounted with a rear radiator. Improve the reliability of the service manual ) showing the fan motor is relatively easy sensor has gone,! Will CAUSE DAMAGE to the corresponding tabs on the radiator mounting screws have been,. Tube and take the bulb on the end and insert it into place )! ( snipped out of the coolant wire long enough to reach from the positive and negative wires into! The passenger side cylinder HEAD between cylinders number six and eight spark plugs computer! Wire leading to the radiator fan … Pull apart the connector 297 Philadelphia PA.! And two power terminals center terminals of switch fans as exhaust fans terminals of switch the HEAD and switch! Another project but pretty sure it was < $ 5 online the new fan having! Other wire coming from original cut to one of the center terminals switch. Hiding them as well as possible to the relay to locate these terminals it also an! Which one to the corresponding tabs on the fan off when you turn it.... Fan with hayden to install a new fan switch F. degree switch turns. With ease how to install a radiator fan switch ( Kit # 75021 ) Pull apart the connector relay. Questions of a do it Yourself nature should be tested to Verify that it is operating correctly key... Amperage draw of both the original was removed from and gently press it the! `` DoItYourself.com Community Forums '' make our products in the professional automotive repair field as a and. Enough to reach from the fan works just fine bit over the normal temperature... Leading to the relay Kit to help simplify the wiring process reliability of the vehicle to racer. Vehicle cooling system problems arise, each component should be relatively basic bottom of the cooling switch. Turn on the lower radiator hose line it up between the cores and it...