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3.4 overheating

 
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EastLA
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PostPosted: Fri Aug 16, 2013 1:50 pm    Post subject:  3.4 overheating Reply with quote

My 3.4 drives fine in the streets n on the freeway for a while. but then when it come to a stop the temperature rises pretty high around 230. when i check the engine i open the bleeder screw a lot of air escapes. but i notice that it pushes all the coolant into the overflow bottle. i have a 180 t stat and the computer is tuned for it. the water pump is new and the fans and radiator are about 2 years old. and i recently did a coolant flush n fill.
there are no leaks anywhere. no coolant in the oil either. i recently changed the radiator cap aswell. im losing my mind here
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Irish_alley
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PostPosted: Sat Aug 17, 2013 1:55 am    Post subject:   Reply with quote

when its hot are both fans on?

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EastLA
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PostPosted: Sat Aug 17, 2013 2:32 am    Post subject:   Reply with quote

yes both fans are on n i have bled the system but it still seems to reintroduce air into the system. im not losing or missing any coolant it just pushes it to the overflow bottle n doesnt go back into the radiator
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Irish_alley
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1986 GMC Sierra
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PostPosted: Sat Aug 17, 2013 5:34 am    Post subject:   Reply with quote

not sure but, if the system has pressure the only air that could be getting in would be from the engine. but it would be overheating all the time not just at idle. how was the fluid when you flushed it?
also the fluid going to the expansion/overflow tank is norm because your releasing pressure and the fluid is expanding.and one of the easiest place for it to travel if the tank. i would put a rad tester on it and see what the pressure is and test for exhaust gases, is your rad clean of a lot of bugs/trash? how long has it been doing this?

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98ss
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PostPosted: Sat Aug 17, 2013 12:44 pm    Post subject:   Reply with quote

Head gaskets are more than likely toast, I did two this year that had the coolant blow into the reservoir. You can buy a combustion gas analyzer kit, or use the pressure tester as said before to double check. Either way just grab the heavy duty fel pro head gaskets, intake gaskets, and bolt kit from rock auto. You can reuse the factory header gaskets and don't be surprised to find snapped studs inside when you take them off. Take the heads in and have them gone thru. No biggie.
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Frank4202
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PostPosted: Sat Aug 17, 2013 3:47 pm    Post subject:   Reply with quote

98ss wrote:
Head gaskets are more than likely toast.


BINGO. Hopefully its a repair youre capable of doing yourself. If not, start saving your money.

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EastLA
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PostPosted: Mon Aug 19, 2013 1:42 am    Post subject:   Reply with quote

its been doing it for a while where the temp stays around 185 most of the time. n lately these hotter day i gets up to 200. yeah i kinda guessed it my be the head gaskets. but like i said before my oil is clean no milkshake. but i think im just going to get a complete low mile engine since i can get it on the cheap.
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