Question about 2002 Pontiac Sunfire

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Have a 2002 Sunfire over heated, replaced the thermostat , still hot flushed radiator. still hot runs up to 190 ..what next ? seemed to have rust in water that came out.

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Make sure radiator cap seal is still good a lot of people miss that smallest things but yes

Posted on Apr 16, 2015

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1 Answer

A 2000 buick Regal is running hot and stalling when taking off. before that I bush the rear defrost and the heater fun and rear defrost stopped working. It was a couple week before it ran hot.


Check for a stuck thermostat first. Open the radiator cap when the engine is cold. Start the engine and watch for rapid water movement in the radiator. If you see that then the thermostat is ok. Now watch for bubbles in the water in the radiator. If you see any, that indicates a blown head gasket.You might want to install a back flush kit to flush any rust buildup in the radiator. Auto parts stores have them for a few dollars.

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1 Answer

1999 Dodge Grand Caravan heat is cold


There are two possibilities, one is the thermostat. Many people remove them which spoils the whole heating / cooling system. Since you changed the thermostat, I would check the heater valve on the heater which allows the hot water to circulate through the heating system.
It may be necessary to remove the heater box and flush the heater core since you talk about a lot of rust, which could have clogged the heater core and / or the pipes leading to the heater.

Aug 29, 2017 | 1999 Dodge Grand Caravan

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Drained radiator added prestone Radiator flush refilled and started overheating, drained radiator replaced thermostat and now I get no heat from heater,Radiator water is hot


disconnect the heat hoses going into fire wall , put hose into one with pressure and flush as it sounds like it could be bloked in the heater core,the other thing that could be the problem be the hot ,cold switch as it restricts the flow to makes the heater hoter or colder , it might need tlc or replacing as it is manaul not elec

May 08, 2012 | 1995 Toyota 4Runner

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I have a 1994 Jeep wrangler 6 cylinder. I replaced the cooland and therostat and it opens like it should at about 100 but the air is still cold. Is there something I overlooked?


Hello! Thermostat should be a 190 degree...you may have an air blockage...Remove radiator cap start engine and leave cap of until all air bubbles are out (even after thermostat opens)...Cap and test for heat...if there isn't any heat...When that thermostat opens and hot water flows through the upper hose of the radiator that hose will be hot and hard..If you feel the heater hose only one will be hot which means that nice hot water is not passing through the heater core...That could be due to blockage or the control in the car isn't opening the valve on the core...check to see if the heat control is opening the valve...If it is, I would suggest that you purchase a back flushing kit ($10) A plastic tee fits into the inlet heater hose and a garden hose is then connected to the tee...Drain the radiator, remove the thermostat, and turn on the water...do this with heat control on high...The system will back flush out of the top of the radiator and hopefully clean the blockage...Reassemble ...Cap off the tee (cap is in kit)...Install thermostat (190) Is a better choice...Refill radiator...Start engine and leave the radiator cap off until all the air bubbles out............At that point you should have heat...Guru...Saailer

Jan 01, 2012 | Cars & Trucks

2 Answers

Heater core problems no heat changed thermostat still no heat any ideas


try flushing cooling system could be a blocked heater core.if flushing doesnt work remove and replace heatercore.

Nov 26, 2010 | 2002 Ford Taurus

1 Answer

2002 Jetta 1.8T blew 40A cooling fan fuse - overheated, destroyed 4 way cooling hose connector - replaced all- now it still runs very hot, inside temp reads 190 (but temp is much higher), cooling fans run...


Then replace the thermostat, because if on lower hose not hot and on upper hose scalding hot = antifreeze flow blocked by the thermostat wich remains closed!!!

Thermostat replacing:


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Aug 27, 2010 | 2002 Volkswagen Jetta TDI

1 Answer

02 sunfire overheating


make sure you have radiator full of coolant
run the car to operating temperature
check the operation of the cooling fan
feel the upper radiator hose and the lower radiator hose. they both should be hot.
if one is cold then you may have a bad thermostat or restricted flow
if cooling fan does not come on when engine is hot then you have bad cooling fan switch, relay or motor.
good luck

Mar 07, 2010 | 2002 Pontiac Sunfire

1 Answer

Just replaced radiator, now its over heating?


thermostat or heat sencer on the radiator flush it with coolent flush. and use 50/50 coolent

Dec 06, 2009 | 2000 Dodge Durango

1 Answer

Bublling in the thermostat housing and very hot upper radiator hose


I recommend flushing the radiator thoroughly if not done recently. there seems to be some sort of blockage in the radiator at this time. if you get lots of metal fragments that are flushed out during this flush, i will then recommend a rebuild on the radiator or replacement of the radiator. make sure the cooling fans are cycling on time as well.

May 21, 2009 | 2002 Ford Explorer

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