Question about Toyota RAV4
Just changed the radiator on my 2001 rav4. I checked the fans before putting them back but after putting in the new radiator the fans will not come on so the car is heating up. I reconnected the power switches (2) but the is a third switch, I do not know where it belongs HELP PLEASE
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Posted on Jan 02, 2017
SOURCE: Radiator fan not working
I am assuming that you are referring to the radiator fan. You need to verify that the fan motor is receiving 12V when it is supposed to be kicking in (engine hot) with a DVM (voltmeter) in its actual location. Having done this and likewise verifying that the ground is properly attached/connected, then your problem would be with the "clutch". Radiator fan clutch differs from aircon compressor clutch which is electrical and the transmission clutch which is mechanical. Most radiator auxiliary fans (not directly coupled) uses "silica oil". This oil has an inverse property, that is when hot it gets thicker and thus the rotation of the motor is transferred to the blades. There would be a filling hole adequately plug in or near the front of the fan assembly.
If your concern is not corrected by the addition of silica oil or if you can not measure 12V on the fan connector itself when it is supposed to kick in, then chances are your problem is electrically related. Some fan motor switching systems are coupled to the aircon switching.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
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Posted on May 29, 2008
The thermoswitch, if there is one*, is located on the lower portion of the radiator just in front of the turbo outlet pipe. Here is a picture: http://quasimotors.com/fanswich.htm
The other "radiator" is probably your A/C condenser.
You have a 1997 which is T5 engine management (begun in 1995), so there is no thermoswitch because the fan is controlled directly by the ECU from the signal given by the coolant temperature sensor. I would suspect that one of the fan relays has bought the farm. (On some cars, there were two relays, one for low speed and one for high). Here is a picture: http://quasimotors.com/cooling_fan_relays.htm
For general diagnostics of the cooling system, go here: http://quasimotors.com/coolfan.htm
2 stage cooling fan wiring diagram here: http://www.thesaabsite.com/9000/9000-fan-wiring.pdf
This also will tell you where to find other components to check, like the fan speed resistor, and provide other diagnostic checks.
Posted on Nov 25, 2008
SOURCE: Radiator fan not working
Hi. Check the bottom of the radiator or on the side, as you also have a temperature-sending switch. The switch must reach a certain temperature before sending a signal on to the fan relay.
The switch just screws into the radiator.
If you would like to contact me again about this or other problems, feel free to do so.
ASE Master Technician
Posted on Nov 26, 2008
fan will only run when engine is hot,check its working ???if not check the relay connections.if and when you get the fan working see what happens,if it persists then bypass and run fan continuosly ,,see what happens if it still happens with fan on all the time then two possibilitys,,,,,head gasket or plastic impeller on water pump sliding on shaft and not turning ....
Posted on Dec 14, 2008
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