If it spins more than three full rotations, this indicates that it may be prone to slipping. Get a test light or a 12 volt tester and check the three holes that are in the plug end that plugs onto the fan switch at the radiator. Both the thermal switch and the fan motor are not inexpensive items to replace. Run jumper wires between the connector's two electrical terminals. 1 - Radiator Cooling Fan Relays Testing The fan can be tested with the engine on or off (but preferrably off), by removing first the "Fan Low" relay, and putting a test lead, or a heavy wire jumper between relay socket contacts #30 and 87. If the fan starts to spin, the motor is good. If so, a replacement fan costs upwards of $45. Your car’s cooling fan, or radiator fan, plays an important job in keeping your engine cool. It’s the fan motor that makes the radiator expensive. What you need to do now is pull out a voltmeter and test the voltages at the wires coming into the cooling fan … If it stops working, your engine could overheat and be damaged. A radiator fan is not very expensive and can cost around $200 – $400. This is a test. Items per Page. Filter. BRAND. General E46 Forum Fan will work by jumping straight from the battery or by jumping the two wires together that are plugged into the sensor on the radiator.According the my … Once the temperature reaches this cooling stage, the coolant fan will shut off. When cool air is produced in the car’s A/C system , the cooling fan module blows it into the car maintaining a fresh supply of … I've put my Mini dashboard computer in to test mode and got it to display the water temperature on the display. edit- the bike is an 05 Honda VTX 1800F. Other than buying a new fan at 275.00 there has to be a way to know if its bad I would hope. Step 3 – Test the radiator fan. Check also the Thermistor is working. Visually check the fan if you don’t hear its noise. The new Hypertech temperature switch turns the fan on at a much-improved 195 degrees and the tuning chip would help ... all hoses were connected and the radiator was filled it was time to test it. A cooling fan module helps to maintain a constant supply of fresh air into the cabin of a car by controlling the blower that supplies the air. Fans should come on immediately at low with A/C switch engaged. If anyone else needs to know, you just unplug the connector from the switch/sensor on the bottom of the radiator and use … Etc. No codes are present, water is flowing through radiator so pump is good but witout air from fan the car eventually displays engine temp high, drive moderatley , but fan never turns on.....thinking has to be the fan but need to be sure. The light green wire is what turns the relay off and on. 2007 Brute Force 750. If it does not, check the cooling fan relays and engine coolant temperature sensor, and then check for disconnection of the connector or a wire break between the cooling fan relay and engine coolant temperature sensor. Cooling Fan Switch - Radiator. For a Cheap Fan Replacement See Flash's Fan Replacement FAQ. Item number 34 is the Thermo Switch Assembly, part number 37760-MT2-003. The radiator is typically inaudible from the driver's seat, so a simple test to see whether it is working correctly, is to switch on the engine and allow it to idle for 45 minutes. Answer: Make sure there’s proper outside air flow through the radiator or condenser (usually bugs clogging passages). FILTER RESULTS. Connect PicoScope Channel A. to the fan switched earth circuit. PCM (Powertrain Control Module = fuel injection computer). Cooling Fan Switch - Radiator. Once you get the radiator fan system set up properly it is all done automatically. Here’s how to tell if your cooling fan isn’t working, what you should do about it and what the problem might be. Cooling Fans Thermal Switch The cooling fans thermal switch (sometimes referred to by its manufacturers name, 'Otter' ) is fitted in to a waterpipe between the thermostat outlet and radiator inlet , using a special grommet and spring clip . A coolant fan switch is a small and very simple switch comprised of typically two wires. Radiator Fan Cost. Watch this video to figure out how to diagnose problems with the cooling fan relay on a Chrysler. [If you can't find the fan circuit test lead near the ECU, you may not have the coolant recall fan modifications.] Battery out including the box, intercooler pipe off, map sensor disconnected, wiring moved and a deep 30mm socket from Halfords to loosen the switch. This means that the radiator fan switch turns on the radiator fan relay... which in turns activates the radiator fan motor. The cooling fan can switch on without ignition on or engine running. How do I test my radiator fan switch to make sure it turns on at the right temp? If you can do this test, I can fruther help you troule shoot this circut. CRP/Rein (2) Duralast (177) Facet (34) Santech (8) URO (7) Valucraft (2) Show less. Check the online microfiche for part numbers. Turned the car on and left it running for a bit. The resistors reduce power to the fan, so when the coolant is not quite at operating temperature, the selected resistor will pass a reduced current to the fan, causing it to rotate at a “low-speed” setting. Check that the cooling fan stops. The temp increased to to 109C and the radiator fan didn't kick in. Switch must be bad. There will be one terminal that has power with the key off. I am having the same problem. Turns out my fan motor is fine. Thermostatically controlled motors do not work the fan until the engine coolant rises above normal operating temperature, and then switch off when it has cooled down again. I now have a rocker switch in parallel to the temperature switch to act as a test/back-up. The cooling fans on Chrysler cars are not particularly well-made, but that doesn't mean you can assume that they are broken the second the cooling system stops working. The coolant fan will continue to run until the engine temperature cools down to a specific predetermined level. In the above schematic the item number 5 is the Fan Motor Assembly part number 19030-MAA-023. Radiator fan motor relay. Older Volvos had a separate water temperature sensor at the radiator. They're right under the thermostat housing, as others described. Minimize the help page. Fuses (both in the under hood fuse box and in-dash fuse box). Thank you for the reply! 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