Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool. I'm running a 160 degree thermostat . 1990-1996 COOLANT FAN SWITCH INSTALLATION . 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. 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. Brian does his own body work which means he has long board forearms. We had a customer call us and after months of everything working just fine, all of a sudden he had problems with his cooling system. 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. When the coolant within the radiator reaches a specified temperature, the sensor activates the fan. Top Mounted Radiator Cap Location In a cooling system, a higher pressure equates to a higher boiling point for the coolant. Pontiac Firebird 5.0L 1992, Engine Cooling Fan Switch by Autopart International®. Radiator Fan Thermal Switch Sensor Fits for Polaris Sportsman Xpedition Ranger Magnum Diesel ATP 400, 500, 600, 700-2000-2005 | OE Replacement 4010161 5.0 out of 5 stars 1 $10.99 $ 10 . 1985-1989 AUXILIARY FAN WIRING INSTRUCTIONS. Most cooling fans use electric motors that have a moderate to high current draw, and as a result are commonly controlled using relays. 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. You would get the same result by grounding the wire from the relay directly; it completes the circuit. 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. 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). The EFI computer uses a similar sender, which the computer interprets by the resistance in the sender. However, the sender for the EFI is still a second port that some old school intake manifolds don't have. Since this is a two-wire sender direct from the manufacturer, the thread sealer is acceptable and won't interfere with sender operation. If you're coolant temperature is 125 degrees, it's the same as 0 to the sender, and it's switched off. If you take the wire off of this sender and ground it, you're essentially sending the full current to your gauge and it should peg at the highest temperature reading on the gauge itself. A cold engine will provide an open circuit, and no current can flow from the sender to the fan relay. Probe in the radiator between the fins is the best for an electric fan. That sender contains a switch, rather than a variable resistor, and is either on or off. the fan turns freely by hand. Derale Cooling Products 16731 - Derale Single-Stage Fan Controllers Fan Control, Thermostatic, Thread-in, 190 Degrees On/175 Degrees Off, Kit Part Number: DER-16731 "ignore list"? Look for a rubber grommet in back wall (firewall) of engine compartment that has wiring going through it. This half-inch spacer fits between the intake manifold and thermostat housing, and provides two additional ports for additional senders and switches. 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. Flex-a-lite invented the Flex Fan and holds the patent for the first electric fan for the automotive aftermarket. The engine coolant sensor or a separate engine temperature switch is used to monitor engine temperature. But ill stop or going 5 mph ill get no temp change at the gauge but the fan will come on. He also noted his factory gauge wasn't over in the "H" zone yet. Use Code: CELEBRATE. 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. For one hundred years, Beck Arnley has been providing premium OE quality parts for vehicles. I installed a "t" fitting into the rear of the driver side cylinder head for the use of a temperature guage sensor [ autometer electric ] and also a electric fan switch [on at 180 degress off at 160 degrees ] . If only one is needed, the second one can be plugged. Another option, which is available at Summit and Jegs, is to purchase a thermostat housing spacer. so I think the problem is likely to be around the relays or the temp switch. 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. 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 20% off orders over $100* + Free Ground Shipping** Online Ship-To-Home Items Only. 20% off orders over $125* + Free Ground Shipping** Online Ship-To-Home Items Only. We'll answer that one below, because there are some tricky options that will give you another port or two, and sometimes you just have to get a little creative. Eventually, the fans could be triggered by the EFI computer, and the gauges could be fed by the computer, which stored all data thanks to onboard diagnostics (OBD). 95 Most EFI conversion kits (designed to replace the carburetor on a 4150-flanged manifold) will require a dedicated temperature sender, so the one used for the temperature gauge cannot be shared. For classic cars, to operate a gauge the sender is a variable resistor that slowly allows more current to travel to the gauge as the engine gets warmer. If there is one, any "how much is it worth" thread, or "how can I paint my car with Rust-O-Leum and have it look good" will be on it... Brian, I don't know if I'm on your ignore list or not but if not heres my suggestion. So sure locking the fan speeds at say 50% would give me the best and most accurate CPU temperatures for both mounting points but my aim was to do a more real-world test. Use Code: WOW20OFF. The engine cooling fan only runs when needed to help cool the engine. 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. Because the fan relay sender is just a switch, it doesn't detect variables in temperature like a typical gauge sender does. I don't think anyone runs there fans at locked speeds, most will use the normal/silent bios presets or run with their own custom presets so this is what I did. So what can you do if you don't have any extra ports for the new sender? Otherwise, it will run for quite some time before the engine is cool enough for it … 99 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. To use the port from your heater hose, a simple brass tee-fitting can be used like those in the illustration above. The fan sensor, or cooling fan control switch by its more popular name, controls the operation of your Cadillac's radiator fan. 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. 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. If your sender reads the temperature after the thermostat opens, then it might not function properly. The Location of a Cadillac Fan Sensor by Marion Cobretti . Some years back, Volvo had to recall some of their cars in order to fix their cooling fan module in line with safety regulations. A cold engine will give a static temperature of about room temperature, and as the engine idles/runs, the resistance decreases and sends that info to the computer, much like it does for a temperature gauge. Performance cooling products for the automotive market. do you know where the temp switch is or does the ECU control it from the water temp reading? Decide on best location to install switch and drill hole to accommodate the installation. Order Cooling Fan Switch for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. The first step in adding a switch to a radiator fan is to disconnect the battery's negative terminal. I think the ignore list is way better than the punched in the lip list. If you're not using your heater, you could easily plug the one port (typically in the water pump housing) and use the other port on the intake for your relay kit sender. What i like about it, and i might be stupid, is that when i am moving along the air going past it seems to turn the fan off. The SPAL cooling fan switch features 3/8" NPT threads on a stainless steel, hermetically-sealed body. 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. Your Cadillac actually has two cooling fan control switches. 1985-1989 COOLING FAN SWITCH INSTALLATION . ). When vehicles started coming off the showroom floor with fuel injection, we started to see more sensors and switches than ever before. The cooling fan relay is the relay that controls the engine’s cooling fans. And we proudly make our products in the U.S. Once the temperature rises to a set level, in this case about 185 degrees, the switch closes. A cooling fan, however, requires a different type of temperature sender, much like the one in our Fan Relay Kits. It uses Be Cool’s “through-the-radiator” fan design and offers a tapered-protective grate-sealed, waterproof, high-performance electric motor. 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. After some conversation, we found out that the only thing that changed was that he added a temperature gauge under the dash. 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. He wanted to keep the factory gauge, which only read C to H, but wanted an additional gauge that would tell him what the actual temperature is. The radiator is a '93 GMC van crossflow mounted on end, with the original filler neck on the bottom. If he had kept driving around town, his temperature likely would have reached over 220, and his fans would probably never turn on because the gauge was stealing that signal. Check out free battery charging and engine diagnostic testing while you are in store. This results in the fans not turning on at all. By connecting the gauge wire, which requires a variable ohms sender, the signal is stolen from the relay. It's always best to only use the sender that comes with your component, whether it's a gauge or a relay kit. It is recommended that a radiator cap be used with the highest pressure rating that the radiator is designed to accept. Cooling Fan Switch by Beck Arnley®. Check here for special coupons and promotions. A single-wire sender must be installed without thread sealer or tape because it relies on the ground connection with the intake manifold. If your coolant temperature is 210 degrees, it's the same as seeing 185 degrees, and it's switched on. Part number 91064028 has options for fan turn on and off and with the 170 degree thermostat the hot coolant will enter the radiator at 170 and in many cases may cool the engine to this temperature without the fan … 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. Terms of Service. I got something like this but mine looks like its out of a home depot. For that reason, the relay sender cannot be shared or used for the temperature gauge inside the car. 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. 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. 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. And then there was another sender that was used for the electric cooling fans, and these three temperature senders are typically not shared across components, as they are used for different purposes. 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. Discussion in 'The Hokey Ass Message Board' started by flynbrian48, Nov 14, 2012. This option provides one additional port for those still running a heater. LOL, if I had one, I'd put LOTS of people on that one, but you're not on the list! Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35.00+. Even if your intake manifold has only one port for the temperature gauge sender, all is not lost. Free Same Day Store Pickup. this video shows methods of troubleshooting a radiator fan on a HONDA CIVIC 93'. Because the fan relay sender is just a switch, it doesn't detect variables in temperature like a typical gauge sender does. Copyright © 1995-2020 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Wiring Instructions: 1985-1989 B4P Option equipped Corvettes We have aluminum radiators with matching aluminum fan shrouds for electric fans. 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. This allows for the hose connection still, as well as an additional port for the new sender. Our cooling fan sender is an on/off switch. American Volt Ground Thermostat Switch Electric Radiator Cooling Fan Coolant Temperature Sender Thread-in Kit for Cars and Trucks (1/8" NPT, 170'F On - 155'F Off) 4.3 out of 5 stars 177 $19.95 $ 19 . The electric radiator cooling fan assembly is controlled by a thermoswitch located in the side of the radiator. Because electricity will take the path of least resistance (and a short is the most direct path) the relay never got the signal and the fans would no longer click on. 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. Higher coolant pressures also transfer heat from the cylinder heads more efficiently. That is serious punch in the lip right there. That way you can get a proper temperature reading. 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. Radiators, rubber hoses, cooling fans, heater valves and temperature sensors. If your coolant temperature is 210 degrees, it's … Find our best fitting cooling fan switch - radiators for your vehicle and enjoy free next day delivery or same day pickup at a store near you! I speed up and it turns off. Order Toyota Corolla Cooling Fan Switch - Radiator online today. If you're coolant temperature is 125 degrees, it's the same as 0 to the sender, and it's switched off. Go with this high-quality product to restore your vehicle’s lost power and bring it back to its optimal condition. Privacy Policy. Datsun 240Z, 260Z, 280Z and 280ZX coolant related parts. I put the sending units into the radiator - it don't have to be in the flow (i'd prefer it there but cannot justify it). Wiring A Single Cooling Fan. 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. Add an electric cooling fan, and there's another port needed for the switch to turn on the relays. This engine is cooled by a new walker 4 core z series radiator . I apologize for it may be hard to understand some of my words. 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. At higher coolant temperatures, the switch closes to start the cooling fans. We'll show you two methods that are simple and affordable. 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. Sharing The Fan Relay Sender With A Gauge: Bad Idea. This completes the ground circuit and if everything is wired correctly the fan relay clicks closed, and the fans come on. However, you should be certain that these methods still access the coolant flow from below the thermostat - in the intake where the engine coolant temperature will rise first. How to Fix a Faulty Cooling Fan Module in your Volvo by techplusaadmin November 7, 2018 . Thermal fan switch threads into your intake manifold or cylinder head and activates a relay (not included, sold seperately) when the bulb is immersed in coolant that is 185° F or 195° F, depending on which electric fan switch you use. These brass fittings can be found at many auto parts stores like NAPA, or at home improvement stores. 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. 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. With our temperature controlled switch you can have a complete cooling … There are ways to get around this by using a thermostat spacer or a brass T-fitting.