1991 Toyota Corolla Radiator Fan Inop. Engine Overheating

ALEXPR82

MEMBER
1991 TOYOTA COROLLA
4 CYL
2WD
AUTOMATIC
10,000 MILES

Main Radiator Fan Not coming on at all. It only comes on when AC is turned on along with the compressor Fan. Radiator is brand new. There are no coolant leaks. But there is a small cut in the mifddle of the inlet hose. Could this have been caused by excessive overheating? Or could this small cut be the main problem for overheating.

5 Replies

MHPAUTOS

MECHANIC
31,937 POSTS

Hi there,

Thank you for the donation,

There is a thermo switch that turns on the cooling fan, I will locate a pic and location for you, the hose should be replaced, this may be a result the overheating.

Mark (mhpautos)

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Sunday, October 25th, 2020 AT 11:42 AM

ALEXPR82

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3 POSTS

Perfect! Even better. Ill be waiting for the picture.
Thanks

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Sunday, October 25th, 2020 AT 11:42 AM

MMPRINCE4000

MECHANIC
8,548 POSTS

Coolant fan switch is below the distributor, a white round connector. If you unplug it the fans will run all the time (or should).

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Sunday, October 25th, 2020 AT 11:42 AM

ALEXPR82

MEMBER
3 POSTS

Yep, fan did run as soon as ignition was turned but engine overheated. Opened up the air valve and there was no thermostat AT ALL. Put in new thermostat and hose and thermostat housing was bone dry. Changed hose, installed new thermostat and gasket. Replaced coolant because it was empty and car seems fine.

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Sunday, October 25th, 2020 AT 11:42 AM

MMPRINCE4000

MECHANIC
8,548 POSTS

Check for leaks, the antifreeze had to go somewhere.

If you have to, get the cooling system pressure tested.

I also have to tell that, owning a 91 myself, it MAY be the waterpump is on its last leg, especially if it is the original one. Look at the weep hole in the WP for signs of coolant.