Overheating...please help

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Apr 27, 2009 | 08:34 PM

JeaneGrae

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Overheating...please help

Fellas i have tried the following with no luck. Checked the radiator, hoses and water pump for leaks...none found. Flushed the system refilled with 70%dexcool. 20% water, new radiator cap, and replaced the coolant level sensor. All with the end result of still running hot. Collant isn't overflowing, just heating up to abot 240 and my car never really went past 210. I also checked the radiator and condensor for dirt, debris or plastic bags...nothing. What could this be? I

If i remove the radiator cap and let the car run for about 5+mins the coolant level slightly rises but doesn't run out of the radiator neck housing. Could this be a bad water pump or t-stat? Any help would be appreciated.

Apr 27, 2009 | 08:43 PM

waterbug1999

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If your still having issues I would change out the t-stat... Also have the heater on so you make sure you get all the air pockets out.

Apr 27, 2009 | 08:57 PM

conan

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From: Back in the Burg

X2 on changing the stat. Also when watching the coolant you should see in go down a little when the stat opens and then you should see it flowing.

Apr 27, 2009 | 09:06 PM

01ssreda4

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From: Turnin' Wrenches Infractions: 005

Quote:

Originally Posted by waterbug1999

If your still having issues I would change out the t-stat... Also have the heater on so you make sure you get all the air pockets out.

i agree also, and air pockets play hell on temp sending units tricking them into giving false readings.

Apr 27, 2009 | 09:23 PM

JeaneGrae

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....

So after i change the t-stat i should remove the radiator cap, turn the heat on and let it run for about 5 mins or so?

Apr 27, 2009 | 09:34 PM

waterbug1999

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From: Minnesota

Quote:

Originally Posted by JeaneGrae

So after i change the t-stat i should remove the radiator cap, turn the heat on and let it run for about 5 mins or so?

Just watch the temp guage. I have squeezed the top radiator hose before while running and was able to get some more air out of the system.

Once its heated up, you can see air pockets bubbling out when the t-stat opens.

Apr 27, 2009 | 10:00 PM

up2nuthingud

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you could also try bleeding the air out of the crossover tube on the front of the cylinder heads. thats what i had to do with mine when i changed my t stat.

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Apr 28, 2009 | 07:55 AM

conan

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From: Back in the Burg

It's right in front of the intake manifold. It goes from one head to the other.

Last edited by conan; Apr 29, 2009 at 09:31 PM.

Apr 28, 2009 | 08:11 AM

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Deeavi

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From: Bowman, SC

I always drill two small holes in the thermostat diafram before I put it in place. Works like a charm!

Apr 28, 2009 | 08:39 AM

#11

jimmyblue

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From: East Central Florida

I also drill "steam holes" in my 'stats. Too big might
bother you northern folks' winter warmup but I've
never had a prob with 3/32". \

I see no mention of whether the fans are running
during the overtemp swing.

Apr 28, 2009 | 12:17 PM

#12

JeaneGrae

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Thanks for all the input fellas. As far as bleeding the coolant line how do i do this? Do i disconnect and squeeze the line? The fans kick on right at 210 and remain on for about a minute after i turn the car off. They stay on the whole time from when the car reaches 210 degrees.

Apr 28, 2009 | 11:38 PM

#13

TheSilverOne

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From: Taxachusetts

Quote:

Originally Posted by JeaneGrae

Thanks for all the input fellas. As far as bleeding the coolant line how do i do this? Do i disconnect and squeeze the line?

Quote:

Originally Posted by up2nuthingud

you could also try bleeding the air out of the crossover tube on the front of the cylinder heads. thats what i had to do with mine when i changed my t stat.

disconnect the crossover tube