1994 Toyota Corolla Overheating

Tiny
CHRISP83
  • 1994 TOYOTA COROLLA

Engine Cooling problem
1994 Toyota Corolla 4 cyl Front Wheel Drive Automatic 153000 miles

My car temperature used to always stay around the half way mark on the temperature guage. Now it keeps rising to close to the red. I noticed that the electric cooling fan is not coming on. I bridged the terminals on the relay that switches on the fan, now it runs constantly. This seems to help, although the temperature guage tends to occasionally rise above the "normal position" I've tried replacing the relay in the fuse box, but the fan still does not turn on automatically.

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Thursday, April 3rd, 2008 AT 1:32 PM

6 Replies

Tiny
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There is a thermal switch that turns the fans on, check this, and make sure the thermostat is working and the radiator has a good flow rate, re post if you have trouble locating the thermo switch,

Mark (mhpautos)

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Friday, April 4th, 2008 AT 3:42 AM
Tiny
CHRISP83
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Thanks for the info. Where would I find the thermoswitch?

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Friday, April 4th, 2008 AT 4:56 AM
Tiny
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Hi there,

I will see if I can post a pic for you. But from memory they are near the thermostat on that model will check it out.

Mark (mhoautos)

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Friday, April 4th, 2008 AT 6:59 AM
Tiny
CHRISP83
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By "THEY" do you mean there is more than one?

I noticed 2 switches that I suspect could be the thermoswitch.

First is located on the thermostat housing and has one wire coming out of it.

Second one is mounted in the actual engine block and has 2 wires connected to it.

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Friday, April 4th, 2008 AT 8:01 AM
Tiny
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Hi there,

The switch with the single wire will be the temp gauge sender. The other should be the thermo fan switch

Mark (mhpautos)

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Friday, April 4th, 2008 AT 8:46 PM
Tiny
MMPRINCE4000
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If you disconnect the fan switch, the fans should run all the time. If they do not, then it would be a relay.

Another thing to check is to turn on the AC, the fans should run at a lower speed, if they do not then again it is one of the fan relays or the main engine relay.

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Saturday, April 5th, 2008 AT 8:35 AM

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