Question about 1999 Pontiac Grand Am GT

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Overheating coolant is boiling out of what seems to be the drainage hose. cant go more than 5 miles without overheating. either its coming out of the drainage hose ore somewhere beneath my passenger tire. what to do??

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  • 37 Answers

Odds are that the thermostat is stuck in the closed position. Replace it with a new one with a new gasket. Its easy to do and will cost around 10 bucks. Also watch the exhaust to see if it is making a lot of steam and dripping greenish water. If it is then you have a more serious problem like a blown head gasket or cracked head. Don't continue to drive with a overheating engine because it can cause the head to crack or warp.

Posted on Feb 16, 2014

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Posted on Jan 02, 2017

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SOURCE: Engine overheats on Pontiac 2002 GP

Check the catalytic converter. If it is clogged, it will reduce your your power and increase the temp of the car, especially on steep inclines.

Posted on Aug 31, 2008

  • 2039 Answers

SOURCE: Overheating!

change the thermostat blead the system of air put prestone in it and try it out hope it help fixya our post thanks pierre

Posted on Jul 13, 2008

  • 160 Answers

SOURCE: low coolant light comes on

if the van is not overheating and the coolant is full than your sensor is bad

Posted on Nov 12, 2008

  • 14036 Answers

SOURCE: overheating 2001 pontiac aztek

remove coolant.remove thermostat remove bottom radiator hose to water pump.put a empty container under the radiator.take a water hose put it where thermostat goes flush out the rust in block.watch the water as it come out the water pump .if stream water is small keep flushing until you get a study sream of clear water. also flush out radiator. lower water pressure dont flush radiator it with high water pressure you could burst it. make clean the over flow jug .make sure it not stopped up.put in a new thermostat and radiator pressure cap. fill radiator with half antifreeze and half water.bleed the coolant system.

Posted on Apr 20, 2009

  • 11 Answers

SOURCE: Overheating, no coolant loss

I have a 1996 Pontiac Firebird with the 3.8 L V6, and have had problems until I replaced the DexCool (it's never ran so good!) However relating to your problem, there was a class action lawsuit regaurding the 1996 GMC/BUICK/PONTIAC 3.1 L engine, due to DexCool destroying the engine/heads/etc. Follow the link - I do not know all of the details, but it may be worth checking out. 1996 was the first year that DexCool was used at GM.
Hope it helps.
http://www.dexcoolsettlement.com/

Posted on May 14, 2009

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You say its overheating but not loosing coolant, is it truly overheating or is the gauge telling fibs. You seem to have done all the right things but if it retains its coolant I don't see a reason other than the gauge. When you next run it and it shows overheat on the gauge, get a rag and very gently crack the rad cap. If hot water comes out but no steam then it may not be too hot. If after a few minutes you are able to safely remove the cap see what the gauge says with the key on but not running. If the gauge says its still high then the gauge is faulty because its obviously not boiling the coolant.
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if you have cold air from your heater vents they you have air in your system. When your thermastat stuck you probably lost a lot of you coolant and if you didnt add any more i am sure thats your issue. just low on coolant now. When it goes to the heater core, there is nothing left to pump around the engine.

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