Camaro overheats

CHEVROLET CAMARO
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ALFRASER
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I have a 1998 Camaro 3.8l auto 150000miles It overheats.
I have replaced the radiator water pump temperature switch and fan relays. The fans come on when the A/c is on. They do not always come on when the cars is hot. It does not always overheat. I have bled air from the system with the bleeder screw at the thermostat housing. I have flushed the system several time. It does not always seem to flow water at the radiator cap.
Thanks
AL
May 15, 2007 at 7:16 AM
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GMFACE
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When it overheats, do you see coolant has poured out of the overflow cap?

Are there any particular times that it overheats more than others?

Have you had the car checked at a garage?

Have you tried replacing your radiator cap?

With those aside, when the temperature sensor reads the optimal temperature (somewhere around 197 or so), it sends a signal to the computer, which turns the fan on for 30 seconds.

Have you been going faster than 70 mph when it overheats? Because, I think I read something along the way that if you're traveling in excess of 70, the fan does not engage. I'm probably wrong on that, but anyway...

If your cooling system checks out okay - your water pump, fan(s), temp sensor, radiator, hoses, heater core, thermostat, and radiator cap, then your computer may not be controlling the fan properly.

I would also check for a weak hose. Sometimes, a hose can become hot and weaken to the point that it collapses while the engine is under load. If any of them feel suspiciously soft, I'd give it a changing.
May 17, 2007 at 12:32 AM
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