Question about 2002 Chevrolet TrailBlazer

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Steam fills car when i turn on the rear heat liks water have just replaced the thermastate thinking that is why linking no sing of any leak when hood is raised around the hoses or raidiator

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It sounds like the leak could be under the passenger side dashboard which is where the heater core is located. The heater core a small radiator that a fan blows air over to heat the inside of your car. Is the steam coming out of the vents when you turn the heat on?

Posted on Oct 05, 2010

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Posted on Jan 02, 2017

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Over heaating i think thermastate replaced hose


its a posability that it could be the thermostat,its also a good possability that its an air/steam pocket,from being trapped in the motor.so try to bleed all the air out of the system first.on mine i bought a splice connector that lets me fill the system from the smaller hose from the bottle to the thermostat housing works much easier.and you can run it while you fill it with this.you actually can connect a hose garden hose to it or fill it manually.comes in a kit.

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It over heats we replaced the thermistate (spelled wrong)flushed the radator still over heated took thermastate back out left it out it worked good but now is over heating again


CHECK WATER PUMP WEEP HOLE SEE IF ITS LEAKING ANTIFREEZE IF SO WATER PUMP SHAFT BEARING GOING BAD CAUSING WATER PUMP LOCK UP HARD TO TURN.MAKE SURE DRIVE BELT NOT SLIPPING DUE TO BAD BELT TENSIONER.CHECK TO SEE IF COOLING FANS TURN ON WITH AIR CONDITIONER ON HIGH.IF NOT CHECK HEATER + AC IGNITION FUSE.IF FUSE GOOD.YOU HAVE FAULTY COOLANT TEMPERATURE SENSOR.IF ALL LOOKS GOOD.CHECK ENGINE OIL IF LOOKS LIKE MILK SHAKE YOU HAVE LEAKING HEAD GASKET.IF OIL LOOKS GOOD.YOUR ENGINE CYLINDER BLOCK WATER CORES CLOGGED UP WITH RUST RESTRICTING COOLANT FLOW THROUGH THE ENGINE BLOCK TO REMOVE HEAT AWAY FROM THE ENGINE.BLOCK PROBABLY NEED FLUSHED OUT AT RADIATOR SHOP.

Jun 23, 2010 | 2001 Pontiac Grand Am SE

1 Answer

Thermastate and high heat


Yes i would check if your radiator fin turns on when the engine gets warm.
Most likely thats the cause.

Jul 11, 2009 | 2002 Jeep Grand Cherokee

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2000 jaguar overhearts after upper hose replacement. water boils/steams out of back/bottom of the resevoir. temperature guage stays at normal but the car overheats and stalls out.


It may be that the system is airlocked, this can happen after work on the cooling system - if most of the water has been lost. If you think there is no damage to head gaskets or other seals between engine and coolant system or leaking hoses - try bleeding the system as you fill it by venting air from the top hoses when engine is cold (for safety).
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Jul 06, 2009 | 2004 Jaguar S Type

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Coolant leak from upper radiator hose where it meets engine


thermistate housing is the place you refer to it fuction is to hold a thermastate to open and close water flow at 150 to 190 degree according to car spectif the thermaste sticks it causes overheating and can blow the thermastate gasget, the tole cost is about 30$ at most for the thermastate and gasget...now many other things can cause a car to over heat and cause a hose leak and somtimes it is simple to just tighten the hiose clamp at the thrmastate and problem sovled see a water leak causes the radiator to lose presure and thus with out a sealed tight water cooling system the boiling point of water is lower and thus the car over heats when in doubt stop by the local gas station and have a tech take a quick look as it could be simple as the hose clamp difficult as a therm,astate but do not let it go to warp a head gasket as this blown headgasket is what is the end results of running a car to hot

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1 Answer

Coolant leaking on manifold, steaming.No hose or radiator leak.


i think its going to be the head gasket duto the way its leaking coolant. one of the water jackets maybe i would have it checked to be sure but it sounds like head gasket

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