Question about 1991 Toyota MR2

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Radiator fan and ac fan always on

Every time i turned the ignition to on position both fan from radiator goes on

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Fan relay needs replaced I would imagine.

Posted on Jan 10, 2010

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Posted on Jan 02, 2017

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The twin fans behind the radiator runs all times even when the car is cold in the morning soon as i switch on the car.


Do you have the AC in on position from previous time when turned off. ?
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Radiator Fan always on.


Doesn't take a technical engineer to find what could be the problem ! Looking a wiring diagram I see three relays that are used to turn on the cooling fans ! One of the relay's contacts are stuck closed causing Battery voltage to be applied to one of the fans when you turn the key to the on position . Your best bet , take it to a qualified repair shop .

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The fan relay may be malfunctioning (the fan relay is what actually switches the fan on and off and gets its signal from the ECM, which in turn gets its signal from the temp sensor) testing/replacing the relay and temp sensor would be the best thing to start with,... unless you notice any additional (non factory) wire attached to the power wires to the fan.  Sometimes folks, in an attmpt to fix  an overheating or fan relay problem, attach a ignition switched positive lead from the fusebox or other switched source to the positive poer lead on the fan,.. making the fan run whenever the ignition is switched on.   

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