Question about 1999 Chevrolet Blazer

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Overheating, losing antifreeze but not from radiator

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IF THE RADIATOR NOT LEAKING.CHECK OIL TO MAKE SURE YOU DONT HAVE LEAKING HEAD GASKET.IF ENGINE OIL LOOK LIKE MILK SHAKE.YOU GOT A HEAD GASKET LEAK.IF OIL LOOKS GOOD.CHECK ALL COOLANT HOSES.AND FREEZE PLUGS.IF YOU FIND NO COOLANT LEAKS.YOU HAVE TOO WATER NOT ENOUGH COOLANT.MIX 50/50 WATER AND ANTIFREEZE.

Posted on Sep 10, 2009

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Only way to be sure is to locate it, if you can't find it, go to a rad shop & they can add dye to coolant & find all traces of leaks, including tailpipe, which would likely mean head gasket, or intake gaskets were troublesome on some GM's.

Posted on Sep 10, 2009

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  • Master
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It may be your heater core. the connections are plastic and do brake. Do you get hot air from your heater or defrost? Can you see the leak? Is it for a head-gasket? How's it running? Is it rough?

Posted on Sep 10, 2009

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1 Answer

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If you are loosing radiator water/antifreeze and you see 'white' smoke out of your exhaust then it is likely that you are seeing steam: this usually indicates that you have a blown cylinder head gasket or have a cracked ylinder head: both situation will cause overheating of your engine. You can also check this situation by waiting until the engine is COLD, opening the radiator cap, refill with clean radiator fluid/water, restart the engine and see if the water as seen in the radiator is violently bubbling. Another condition before even starting the car again is if you see oil/white-brown staining in the radiator fluid caused by cracked cylinder head or gaskets letting engine oil in the radiator circuit. In any case, it is a critical sitation and you should get it checked and fixed immediately.
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If it's overheating it will lose antifreeze.I would change the thermostat first and see it it solves the overheating problem if not then worry about the water pump. Thermostats are only $7-10.

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