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help! over heating

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Old Apr 18, 2012 | 06:40 PM
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Default help! over heating
i got a 2000 z28.. it keeps over heating going down the road.. but fan are on.. and will cool down if u restart it a idle
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Old Apr 18, 2012 | 07:24 PM
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Are you just going by the gauge? It could be a failing coolant temp sensor and maybe you're not running hot at all?

But also an air pocket can slowly grow over time if you have a very small leak. Then a restart can get it moving through again. Are you topped off with coolant.

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Old Apr 18, 2012 | 07:52 PM
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checked water never been low... slow just gotta worse.. its got alot worse today.. went 4 miles to store it was like 245 turn it off went in store 3mins maybe come out got in car it was 210 till i started down the road.. it got hot again.. its boilling too
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Old Apr 18, 2012 | 08:11 PM
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Your t-stat is probably sticking closed or only opening a little bit. Go put another one in.

And if its boiling at 245 you need more anti-freeze/coolant. Our engines can get up to 270 and the coolant shouldn't boil. IN A CLOSED SYSTEM THAT IS.

Or do you mean its boiling out of the over-flow tank.

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Old Apr 18, 2012 | 08:13 PM
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If its boiling into and then out of the over-flow tank.....you can try a new radiator cap. Other than that, a blown head gasket will push coolant into the over-flow tank.

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Old Apr 18, 2012 | 08:36 PM
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it was doing it off..it was low of coolent i took off top hose refilled it.. its still getting hot just not as bad..
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Old Apr 18, 2012 | 08:50 PM
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Originally Posted by criticalx
it was doing it off..it was low of coolent i took off top hose refilled it.. its still getting hot just not as bad..
It was doing WHAT off? Coming out of the over-flow tank?


If it was low you could of had an air bubble on the engine side of the t-stat.

.....You need to start the engine cold, radiator cap off. Stand there and wait for the coolant to start to flow. When it does, top it off when the level drops down. Then wait for it to happen again and top it off again.

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Old Apr 18, 2012 | 09:00 PM
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it was boiling with the motor off.. it not going to over fill tank.. it was just boiling in the system
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Old Apr 18, 2012 | 09:09 PM
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Originally Posted by criticalx
it was boiling with the motor off.. it not going to over fill tank.. it was just boiling in the system
Sounds like you have air in there then.

Do what I said above..........to get it topped off with no air in there.

Only other way coolant boils inside the system....blown head gasket.

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