Help - Radiator fan testing procedure - overheating - Toyota Nation Forum : Toyota Car and Truck Forums
Camry 1st & 2nd Gen (1983-1986) & (1987-1991) Toyota Camry Discussion for years 1983-1986 & 1987-1991. Topics of discussion range from fuel economy, safety, modifications, performance all involving America's favorite family car, the Toyota Camry.

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post #1 of 5 Old 06-11-2019, 06:35 PM Thread Starter
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Help - Radiator fan testing procedure - overheating

4 cyl 1989 Camry here (with AC). Wondering if it is true that our Camry's have a fail safe system for the rad. fans in that they will turn on automatically if the relay fails (or if it is removed) except for if/when the coolant temp sensor fails? Is this true? Is it also true that if you disconnect the coolant temp sensor, the radiator fans should kick on high? Thanks.a
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post #2 of 5 Old 06-12-2019, 01:32 AM Thread Starter
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Okay -- more data for the query on this. I was able to perform the following tests:

1. Unplugged all 3 radiator relays individually, with engine running -- this did not cause any fans to come on (and all 3 relays are verified working)

2. I unplugged the coolant temp sensor (the one plugged into the thermostat housing), with the car running, the radiator fans did not fire up

I am right to conclude that coolant switch is fershitzzled? Me thinks I am right. Anyone to say I am wrong??? BUMP.
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post #3 of 5 Old 06-12-2019, 09:51 AM
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I'm not terribly familiar with the Gen 2 Camrys, but on the Gen3's w/ the 5SFE four cylinder, there is a coolant temperature switch mounted in the radiator, passenger side, bottom, rear-side. This one controls the fans. The one in the thermostat housing is for the ECU to monitor and controls fueling. It has nothing to do with fan control. Unplug the one in the rad and the fans should run. ...Assuming it's all the same as the Gen3.

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post #4 of 5 Old 06-12-2019, 02:08 PM
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Unplugging the coolant temps switch on the water inlet neck should turn on the fans on high (key in the ON position).

Check if you have power on the connectors to the fans. Removing the relays will turn off the fans - the fail safe is that they turn on the fans in their 'resting' position. Check the 30A RDI FAN and 30A CDS FAN fuses. Check the operation of the Engine Main Relay. Check the 7.5A IGN fuse.

Does everything else on the car seem to work?

-Charlie
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post #5 of 5 Old 06-17-2019, 05:17 PM
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Yes, don't unplug the relays, that's what is powering the fans!!! Unplug the temp-switch on radiator as test if you want.

Better to test voltages at various parts of fan circuit:

1. measure voltage at battery
2. measure voltage coming out of 30a fan fuses
3. measure voltage going into fan relays
4. measure voltage going out of fan relays
5. measure voltage at power-wires going to fan

Where the voltage disappears is your problem.

Also test that the fans actually work. Run some wires directly from battery to fan's connector. Does fans turn on?
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