Question about 1998 Toyota Corolla

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The radiator cooling fans run continuously in my 1998 Toyota Corolla. Would this be the result of a failed thermostat, fan relay or something else?

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Fan switch should be located in the upper radiator tank. Two wires to it. it works off the temp of the water.

Posted on Jul 12, 2010

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Hi...
this may as you said there is a problem with the thermostat ans fan relay

added to it
the engine may run hot due to radiator chocks.because of the the rate of cooling is lesss to compensate this the fan may be continously running. so please check this also

if my answer was helpfull to you please rate me

Posted on Jul 12, 2010

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My Corolla has a connection on the bottom tank of the radiator. If I disconnect it, the fan runs all the time, reconnect it and it operates normally. Check yours and make sure you have a good connection. If the car runs at normal temperature a continuously running fan will not cause any problems.

Posted on Aug 30, 2010

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1 Answer

I have a 1989 EE90 Toyota Corolla 1300 2e. My question is why does engine get so hot and how can i tell if my water pump has failed.. I'm from South Africa


you take the water pump off and visually insect pump vanes
will need a gasket
or check water pump seal isnt leaking (dripping coolant )


other causes of over heating
thermostat stuck
engine cooling fan not spinning fast enough
thermostatic fan switch faulty
soft hoses
clogged radiator


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hi there . there are lots of causes. head gasket. blocked radiator.
air lock. stuck thermostat. check that your fan is actually switching
on and off. if not check the thermo switch on the engine.

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You would first need to jumper the relay to make sure the fan can run, and then check the relay circuits for power and a ground signal from the computer. The computer grounds the relay when the fan is needed.

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sounds like the fan motor relay switch its attached to the fan housing unit, or your thermostat is stuck open. refer to you car bible for instructions on how to test your termostat to see if it functioning properly. Hope this was helpful.

Mar 20, 2013 | 1998 Toyota Corolla

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Hello Ted, I have a 1996 Toyota Corolla that was/is overheating. I changed the thermostat, replaced the coolant and also replaced the radiator fan relay because the radiator fan was not turning on. The car...


temperature switch. The temperature switch finishes the circuit for the cooling fan. Once the engine reaches the specified optimal temp. the switch completes the circuit and turns the cooling fan on. Hope this helps

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95 toyota corolla 1.8 engine, cooling fan works but only when you disconnect the fan switch, or by pass the fan relay, it's not overheating, but it's causing the coolant to overflow the resivor. Replaced...


Check the engine main relay, the radiator fan relay no. 1, 30A CDS and FAN fuses, and the ECT (engine coolant temperature) sensor for proper function. For the ECT, there should be continuity when the engine is cold (200F).

Jan 12, 2011 | Toyota Corolla Cars & Trucks

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Radiator Fan Stays On


A simple test would involve disconnecting the fan switch while the fan is on. If the fan then stops the switch has failed. If the fan continues to run remove the relay , if the fan then stops the relay has failed.
Various inputs/outputs at the relay should be confirmed to be 100% certain something strange isn't going on.
Above all be careful of the fan itself , if it's running obviously but if it's not it could start during repair

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1 Answer

2002 corolla radiator fans keep running Even when the engine is cool and the a/c off. ?


Hello there:
what you are going to have to do is have the temperature sensor for the fan checked and possibly changed if it not working properly this fan will continue to run and run and run

Nov 27, 2009 | 2002 Toyota Corolla

3 Answers

Car's overheating


Check to see if your radiator fans are working. If you have A/C just turn it on and both fans WILL come on unless there is a problem ie: bad fuse(s), relay(s), or motor(s). I don't mean to scare you, but, someone "could" have a pretty bad head gasket leak and still not see fluid come out of the exhaust. If the fans are both working, it could be any number of things from, a faulty coolant temp sensor, a faulty dash gauge, possible air bubble in the cooling system. Another easy check is coolant consumption, if you are leaking coolant into the cylinder while engine is running and/or into the crank case. Just check to see if your coolant level is going down and/or your oil level isn't growing because of coolant filling up your crank case. Hope this info helps...(subytech)...

Aug 07, 2009 | 1998 Toyota Corolla

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