Question about 2000 Pontiac Grand Am GT

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Head gasket/ timing etc

Ok got a 2000 Grand am se 4 cylinder overheated ??? blew air an steam out of thermostat housing gasket no clanks bangs knocks just died along the highway temperature gauge read normal I was the one driving.. Took out plugs they were a lot worn from heat stuck finger down in cylinders all cylinders have kinda good compression dont have a gauge for that... when turning over it fires but backfires in the engine and intense smell of flooding the engine with fuel???? but will not start so what do ya think????

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  • Pontiac Master
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Not 100% sure on that engine, but I'd be looking at my timing chain & gears, especially if gears have nylon teeth. Pull covers & have a look at condition & positioning for correct. Other thing I'd check is distributor & especially gear at end of shaft. If metal gear at bottom, you should be o.k.,but if nylon,could have melted.heated & distorted or broke. Be sure to mark it for re-install & don't crank engine before re-install.

Posted on Feb 24, 2009

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Why is my 1989 Toyota Cressida overheating?


sounds like you have a head gasket gone bad. these cause overheating and the compression gases cause the air in the system and to boil out of the system. as such will cause the heater not to blow hot air, as steam will contain heat very long. the white smoke upon start up is a tell tale sign that the gasket has blown and needs replacement. have a head gasket test done. it could also be a cracked head or even a block, but head gaskets are a problem.

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Why does my Grand Cherokee overheat after replacing the radiator?


there are many causes of overheating.

first off is you didnt stated engine option (size)

the engine can make excessive heat too. (late timing)

1: bad thermostat. 190 is ok, but it can be bad, even a new one.

try a quality brand like STANT, not dura . etc.

2: it must hold pressure, bad cap>? 12-15 psi

3: gee, did use 50% AF. it will not run right with out AF antifreeze.

4: bad water pump. running old AF causes the impeller to rust to nothing.

5: thermostat up side down, or bleed hole not up hill (jiggle pin,etc)

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8: bad fan and related parts, varies by engine option not stated.

9: bad fan controls. same.

10: seem like it overheats even PARKED. right? never moved.

11: if it dont overheat moving fast this is a BIG clue. but nobody wants to take that risk of 10 is true. sure.

12: air in block, did you , ignore the side tank and look in side rad for full of AF 100% by pulling cap cold, over and over, each cold cycle

until dead sure its FULL???????

13: BAD TEMP GUAGE, DID YOU USE AN IR PYYO GUN to prove the thing is really overheating

14: is it boiling over, that is steam or hot water blasting to the expansion side tank???? signs/ got real signs of overheating?



15: passes rad leak down test?

16: passes exhaust leak test to rad test? green/blue checked?

17: steam out tail pipe end hot?

18: pinging, (too hot sighs)

19: OBD2 scan tool shows, 240 and the dash gauge and the pyro gun

all agree its 240"

20: sludge packup on sides of water jackets, seen when pump was pulled and NOT CORRECTED (flushed>?)



at the least.

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1 Answer

98 pontiac sunfire overheating


Sorry to say the head gasket is still shot, and you probably have cracked the cylinder head too.
The excessive pressure in the radiator and the overheating is compression going from the cylinders to the cooling system. You may not be leaking coolant into the oil as fast as you were, but its still letting compression into the radiator.

Jul 27, 2012 | Cars & Trucks

1 Answer

What cause a raditor to boil over after you have replaced radator and thermostat and blew though heater core but not overheating acording to gauge


Unfortunately, you are posting the symptom of a failed cylinder head gasket or a cracked cylinder head. When either fail, combustion gasses will enter the cooling system and push the coolant out. As the level inside the cylinder heads drops the remaining coolant will boil and cause it to appear as an overheat. To verify, first, try re-filling the system with the heater on full heat, just to make sure no air is trapped there. If the condition persists, have a hydrocarbon test done on the cooling system. Often you will find coolant in the engine oil or see steam coming from the exhaust pipe. If you have either, that is enough verification to tear the engine down and do some internal checking. Be aware that some of the cylinder heads on the L6 (4,0) engines have casting flaws called micro cracks that tend to show up around 70K miles or more. If you have one, the head should be discarded as junk and replaced.
There is a casting designation that those heads share...unfortunately I don't remember what it is but likely you can research that.
Your electric fans are working...correct?

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Have a knocking noise in engine and white smoke coming out exhaust? Does this year accord have a timing belt ?


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Overheating can cause knocking.Your best bet is to replace your motor because usually the knocking noise is caused by a spun bearing which would cost a lot to repair.

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1 Answer

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1 Answer

2000 grand cherokee overheating heater blowing out cold air


Generally this condition is the result of coolant loss, or failed thermostat. If coolant goes below cylinder head level, or thermostat remains closed,heat will stop working. Do not drive with this condition as excessive heat buildup in cylinder head can and will do serious damage to heads and or head gasket.
Find out where leak is and correct it. Change thermostat as it may also be damaged. Check for excessive steam from tailpipe or miss in engine, as these symptoms indicate a cylinder head problem.

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