1998 Chevy Cavalier overheating at highway speed

WHYME153

MEMBER
1998 CHEVROLET CAVALIER
4 CYL
FWD
AUTOMATIC
75,000 MILES

I overheated car from a broken belt tensioner and nowhere safe to stop. As a result, I had to remove the head and had it machined. After assembly, with new head gasket, the car runs hot at highway speeds, above 50mph. Driving city speeds, runs normal temp. I have replaced the thermastat, waterpump, and had the radiator rodded and flushed, with the same outcome, still overheating at highway speed. I have checked the hoses and they are okay. What is your suggestion?

4 Replies

GTRGILBERT541

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14 POSTS

Is it leaking any coolant

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Wednesday, April 23rd, 2008 AT 6:47 AM

RHALL77

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3,361 POSTS

How long ago was the work performed? You may still have a air pocket in the cooling system that may need to bleed out

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Wednesday, April 23rd, 2008 AT 7:09 AM

WHYME153

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1 POST

The work was completed just over a week ago. I have had the problem since then. I have bled the coolant system twice with the same result.

It is not leaking coolant, however after it gets hot(the needle is about 2/3) and I stop, it will push some coolant out of the filler cap on the resevoir.

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Wednesday, April 23rd, 2008 AT 8:12 AM

RHALL77

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3,361 POSTS

From my experience it sounds like a air pocket. But it also may be from the heater core leaking also causing the air pocket. Is it leaking by the fire wall or can you small a sweet smell inside the car.

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Wednesday, April 23rd, 2008 AT 8:50 AM