That way you can get a proper temperature reading. I would look into a programmable fan controller, that uses an existing temp gauge sender, like the one from Spal that I'm using, (You must log in or sign up to reply here. Your Cadillac actually has two cooling fan control switches. Flex-a-lite invented the Flex Fan and holds the patent for the first electric fan for the automotive aftermarket. With our temperature controlled switch you can have a complete cooling … This sender detects 185 degrees and turns on, and when the temperature drops to about 175 degrees, it turns off; about a 10 degree window is the difference between on and off. He also noted his factory gauge wasn't over in the "H" zone yet. Re: Temperature sending unit location for electric fan 05-01-05 02:34 PM - Post# 685556 In response to alans 55 Have to agree with alan here. Order Cooling Fan Switch for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. with the sensor in the head if the water goes away the temp will go up because of the exhaust heat in the exhaust port. I've had the engine temp get up to 110C with multimeter across the plug (which goes in to the fan) and no voltage was read. High-Torque Motor – Features an enhanced motor design ensuring the best possible output from a reduced-depth electric fan, which benefits the life of the fan motor. Once the temperature rises to a set level, in this case about 185 degrees, the switch closes. Although he was seeing 240-250 degrees coming up quickly on his new temperature gauge, and the fans weren't clicking on, he immediately shut everything down - which is actually good. By connecting the gauge wire, which requires a variable ohms sender, the signal is stolen from the relay. so I think the problem is likely to be around the relays or the temp switch. 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. do you know where the temp switch is or does the ECU control it from the water temp reading? 1985-1989 AUXILIARY FAN WIRING INSTRUCTIONS. For one hundred years, Beck Arnley has been providing premium OE quality parts for vehicles. At higher coolant temperatures, the switch closes to start the cooling fans. Shutting off where he did, he likely was only about 185 degrees - the point where the sender switches on - and not the higher temperature seen on the gauge. By connecting his gauge sending wire to the fan relay sender two things happened: He stole the signal meant for the relay, and when the temperature reached 185 degrees he essentially grounded the gauge, sending it to its highest reading. Cooling Fan Switch by Beck Arnley®. Gauge manufacturers will include a sender with their gauge and recommend not using a sender from another company or gauge because of differences in readings. If only one is needed, the second one can be plugged. The sending unit shouldn't go into the engine side of the thermostat because it won't shut off when you park and there is no water flow. Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35.00+. Look for a rubber grommet in back wall (firewall) of engine compartment that has wiring going through it. 1990-1996 COOLANT FAN SWITCH INSTALLATION . If you're coolant temperature is 125 degrees, it's the same as 0 to the sender, and it's switched off. I'm running a 160 degree thermostat . There are ways to get around this by using a thermostat spacer or a brass T-fitting. We'll show you two methods that are simple and affordable. If your coolant temperature is 210 degrees, it's the same as seeing 185 degrees, and it's switched on. The radiator is a '93 GMC van crossflow mounted on end, with the original filler neck on the bottom. This completes the ground circuit and if everything is wired correctly the fan relay clicks closed, and the fans come on. the fan turns freely by hand. Use Code: WOW20OFF. Go with this high-quality product to restore your vehicle’s lost power and bring it back to its optimal condition. It is recommended that a radiator cap be used with the highest pressure rating that the radiator is designed to accept. 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. Higher coolant pressures also transfer heat from the cylinder heads more efficiently. Wiring Instructions: 1985-1989 B4P Option equipped Corvettes LOL, if I had one, I'd put LOTS of people on that one, but you're not on the list! Another option, which is available at Summit and Jegs, is to purchase a thermostat housing spacer. You can get creative, but it's important to remember that you want the sender to access the coolant reading from below the thermostat, not above. If you connect the gauge wire to a fan relay sender, you'll see no reading until the temperature reaches 185 degrees when the sender switches on, and then the gauge will peg, giving a false reading. For that reason, the relay sender cannot be shared or used for the temperature gauge inside the car. Check out free battery charging and engine diagnostic testing while you are in store. 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. That is serious punch in the lip right there. Probe in the radiator between the fins is the best for an electric fan. The cooling fan relay is the relay that controls the engine’s cooling fans. And we proudly make our products in the U.S. You would get the same result by grounding the wire from the relay directly; it completes the circuit. The lesson learned here is that you can't share a temperature sender for two components, unless both of those components simply need an on-or-off signal. I speed up and it turns off. Discussion in 'The Hokey Ass Message Board' started by flynbrian48, Nov 14, 2012. A single-wire sender must be installed without thread sealer or tape because it relies on the ground connection with the intake manifold. Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool. The electric radiator cooling fan assembly is controlled by a thermoswitch located in the side of the radiator. However, he didn't have an extra port in the intake manifold for the new sender, so he used the fan relay sender and attached his new wire there. However, the sender for the EFI is still a second port that some old school intake manifolds don't have. Sharing The Fan Relay Sender With A Gauge: Bad Idea. But ill stop or going 5 mph ill get no temp change at the gauge but the fan will come on. "ignore list"? These brass fittings can be found at many auto parts stores like NAPA, or at home improvement stores. Wiring A Single Cooling Fan. 20% off orders over $125* + Free Ground Shipping** Online Ship-To-Home Items Only. Most cooling fans use electric motors that have a moderate to high current draw, and as a result are commonly controlled using relays. Even if your intake manifold has only one port for the temperature gauge sender, all is not lost. Connecting a single cooling fan is a rather straightforward system, it relies on a separate temperature sender to switch the fan on, or you can utilize the cooling fan output if you've installed an aftermarket EFI conversion. After some conversation, we found out that the only thing that changed was that he added a temperature gauge under the dash. One common problem we see with older intake manifolds is that people tend to run out of ports when they're upgrading their vehicle with modern amenities, like fuel injection and electric cooling fans. The SPAL cooling fan switch features 3/8" NPT threads on a stainless steel, hermetically-sealed body. Any time the coolant temperature rises to higher than normal levels, the fan will start and continue to run until coolant temperature returns to a normal range. The EFI computer uses a similar sender, which the computer interprets by the resistance in the sender. Summit and Jegs, is to purchase a thermostat spacer or a kit. 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