Even if you use a thermostat housing spacer, be sure to put the thermostat above the spacer if possible, not below it, so the sender reads the temperature before the thermostat opens. The radiator is a '93 GMC van crossflow mounted on end, with the original filler neck on the bottom. Wiring A Single Cooling Fan. Once the temperature rises to a set level, in this case about 185 degrees, the switch closes. It's best to make sure where you have the most room/access for the sender before you seal everything up, so do some test fitting and make sure that you can install the sender after the spacer is in place. The first step in adding a switch to a radiator fan is to disconnect the battery's negative terminal. Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35.00+. Derale Cooling Products 18739 - Derale Single-Stage Fan Controllers Fan Control, Thermostatic, 180 Degrees On/165 Degrees Off, 3/8 in.-18 NPT, Universal, Kit Part Number: DER-18739 It's also important to make sure that for single-wire senders you should not use thread sealer or tape on any of the fittings. Because the fan relay sender is just a switch, it doesn't detect variables in temperature like a typical gauge sender does. This results in the fans not turning on at all. Free Same Day Store Pickup. 95 do you know where the temp switch is or does the ECU control it from the water temp reading? Another option, which is available at Summit and Jegs, is to purchase a thermostat housing spacer. There are ways to get around this by using a thermostat spacer or a brass T-fitting. Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool. So, A engine cooling fan failure; or a failure of the fan relay or control circuit is bad news; because it can allow the engine to overheat. A single-wire sender must be installed without thread sealer or tape because it relies on the ground connection with the intake manifold. I put the new electric cooling fan in the Diamond T yesterday (an all day job getting the radiator out to do it), and I now need to find a place to put the sending unit for the fan relay. If your sender reads the temperature after the thermostat opens, then it might not function properly. 1990-1996 COOLANT FAN SWITCH INSTALLATION . "ignore list"? This completes the ground circuit and if everything is wired correctly the fan relay clicks closed, and the fans come on. 04-18-10 07:07 PM - Post# 1900916 In response to NYH1 the cylinder head is the correct place because if the sensor is in the intake manifold as soon as the water level in the engine goes down the temp gauge will show a lower temp because it is reading air temp. 1985-1996 Corvette Low Temp Cooling Fan Control Switch would be installed in this location (driver’s side cylinder head between cylinders 1 and 3). Flex-a-lite invented the Flex Fan and holds the patent for the first electric fan for the automotive aftermarket. It started to get more complicated, because electronic fuel injection requires a dedicated temperature sender for the computer, separate from the sender used for the gauge. If only one is needed, the second one can be plugged. The low-speed sensor triggers the fan at 180 degrees F, while the second sensor engages the high-speed side of the fan at 195 degrees F. All three relays are ganged together for easy mounting. This caused a couple of problems, and some false readings. The fan sensor, or cooling fan control switch by its more popular name, controls the operation of your Cadillac's radiator fan. Top Mounted Radiator Cap Location In a cooling system, a higher pressure equates to a higher boiling point for the coolant. He also noted his factory gauge wasn't over in the "H" zone yet. One advantage to the EFI conversion kits is that there is a dedicated output to use for electric fan relays, and the EFI controller can be used to switch the fans on at a set temperature, and off again when the temperature drops below a certain point. And we proudly make our products in the U.S. When the coolant within the radiator reaches a specified temperature, the sensor activates the fan. 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