Also check the radiator cap. It may not be holding pressure or the small vacuum return valve isn't working properly. Ideally you don't want the hang-loose plastic valve but a spring loaded return valve.
Then you need to make sure the thermostat is operating. It's at the return of lower radiator hose. Aftermarket thermostat without jiggle valve can trap air. You should at least feel the upper hose warming up.
You can borrow the cooling system pressure tester (#OEM27049) from Autozone's free loaner tool program.
http://www.autozone.com/autozone/ino...tingAndCooling
Check the water pump operation by feeling the surge in the hose when restricting it. Check radiator fan operation. It should come on when it gets hot or when AC is on (in that case both on).
If all these check out maybe get a radiator shop to do a hydrocarbon test in the coolant and they can also check for radiator restriction with an IR thermometer.
Quote:
Originally Posted by CBPMIKE
My son bought a used 93 camry. The coolant overflow tank had holes and was spewing coolant. I replaced it and filled radiator to neck top and overflow tank to fill mark.
I ran the car for about 45 minutes and it did not overheat. However I notice the level in the overflow tank has increased 50% and the coolant in the radiator is no longer at the top. I don't see any leaks and the car didn't overheat, but I am used to seeing the radiator level unchanged when it has cooled down and the cap removed. Is this common or signal some other problem? Also location of thermostat on this car - end of top hose or bottom hose coming out of radiator to block?
Thanks!
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