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1986 Pontiac Trans Am Overheating

Hi,

The car is a 1986 Pontiac Trans Am. I have this strange problem. I'lltry to explain what's happening with me, but excuse my English I'm notfluent in it.

If running slowly in the City, in normal traffic, the car is notoverheating. The fan start (at 160 i think) and keep working as normal(by switching on/off with the temp go over/under 160). Even if I startthe AC, the heat slightly move up but still under the middle (around218 or something like that). So i have No Problem with heat whendriving in the City and the behavior of the coolant system looks Normal.

This Normal behavior still in case also when i drive on the highway, even if i drive Fast (around 70mph) for hours.

But what really makes me crazy is that the car overheat ONLY whendriving up a Hill (at low OR EVEN high speed) .. the temperature go to 220witch never happens in the city or the highway .... i continue to drivethe hill and the temp move up slowly over 220 .. up and up and up ... as long asyou're driving up!! if there is a flat ground after the hill the tempwould go down slowly to normal. but if the Hill is long and that's thecase in my traveling to the mountains in my country, even that strongfan don't force the temp to go down.

Why it overheat only in driving up a hill or mountain, and works normal on a flat road?

I would mention that i cleaned the radiator recently, and changed its cap also. and the fan is working normally. The engine is restored to its original condition. the air dam is in place.

could it be Air in the coolant system? but if that's the case shouldn't the car be overheated all the time not just in driving up hill??

Any Ideas for Help ??

Regards,
Dany

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  • Anonymous Mar 23, 2014

    while driving yesterday, the temp reached maximum and the alarm started to sound.when I turned the heat down it went back to normal.is it the coolant?how do I change it my self?

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Look under the radiator should have a air deflector it's about 4-5 inchs in width and 3 feet long. It should also have a smaller pointy plastic next to that air deflector.

Posted on Aug 30, 2009

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Its overheating when you go up long hills because the engine is not getting adaquete air in the system. The radiator is angled to get optimal air a certain way. It may overheat but you shouldn't start seeing smoke.

Posted on Oct 09, 2008

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