1994 Toyota Corolla runs hot

MILTOWN

MEMBER
1994 TOYOTA COROLLA
4 CYL
FWD
AUTOMATIC
78,000 MILES

I have a '94 Toyota corolla wagon. It started running hot. Never into the red zone but about 1/2 up to the red. The water pump was bad and was replaced but it is still running hot. I have the fan running all the time. Bypassed the fan switch by disconnecting it. There is a small amount of white on the oil cap. Very small. I did a block test and that turned out good. I have also replaced the thermostat and still the same. I don't know an inexpesive way to check if the radiator is bad. No leaks and the car holds all it's fluids. Stumped any ideas.

Friday, February 8th, 2008 AT 6:37 PM

3 Replies

BLACKOP555

MECHANIC
10,386 POSTS

The white/green foam is usually a sign of a bad headgasket, intake manifold or head.

Quick check is to remove the radiator cap and idle the vehicle and when warm fill up the radiator untill it doesnt bubble down anymore, then if bubbles keep appearing but level stays the same you have a bad headgasket or head.

Did you change the thermostat and make sure it is facing the proper way?

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Friday, February 8th, 2008 AT 7:55 PM

MILTOWN

MEMBER
2 POSTS

I think I'm going with the bad head gasket. The anti-freeze level holds good. I'm not so sure what the bubbles are suppose to look like. I did the block test and the fluid color didn't change. I do see that little bit of white on the oil cap. I think I'm just going to take it in and have a mechanic find out and then do the repair myself. Thanks for the words.

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Friday, February 8th, 2008 AT 9:28 PM

BMRFIXIT

MECHANIC
19,053 POSTS

If no coolant loose then its a circulation problem
double check water pump and thermostat
check radiator
check temp on radiator in different spots
if you have cold spot s
check coolant flow throw the radiator
you may benefit from a good flush

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Friday, February 8th, 2008 AT 9:36 PM