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My '99 Pontiac Grand Am GT 3.4 L is overheating, it has all new hoses, new waterpump, thermostat, head gaskets, maniofold gaskets, and catalytic converter along with o2 sensors, and an overflow tank, the radiator has been flushed, have also checked the heater core and ruled that out, no smell of antifreeze, have attempted to bleed the coolant system, and no air is coming out, no smell of antifreeze, and have noticed no leaks coolant is at the right level, and the car is still overheating! Help any ideas?
Did you bleed the air out of the cooling system following the instructions in the factory service manual?Did you bleed the air out of the cooling system following the instructions in the factory service manual?
That's the first thing I checked, as I have had this issue before, the coolant system is not vapor locked.That's the first thing I checked, as I have had this issue before, the coolant system is not vapor locked.
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Many thermostats have a gasket installed between the thermostat housing and the engine block / waterpump. If the the thermostat is bolted securely - you may need to remove the thermostat and replace the gasket. While you're there - swap out the thermostat too. It's one of those "Two birds / one stone" kind of thing. See the "..Blown Head Gasket..." link below.
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.
Sounds like you had a sticking thermostat when you replaced the waterpump causing an air pocket. Replace the thermostat, and jack the front of the car so that the radiator cap is highest part of the cooling system. Then run the car and burp the air out of the coolant system.
You vehicle blows head gasket very easy,to say it overheated and radiator is solid then you have combustion entering the cooling system. when the engine has cooled down and you can open the radiator cap smell the coolant does it smell like fuel or exhaust? If it does you definately have a head gasket
if you've flushed the system, and made all those changes, ( be sure the thermostat is placed spring towards the motor) you may have a head gasket or warped head issue
First check that the thermostat was installed correctly. It will not work properly if it was installed upside down. If this is the original radiator, it most likely is plugged up with deposits and corrosion. It needs to be replaced with a new one.
It is probably the problem. To make shure that need to change the gaskets, one of the symptoms use to be thet the temp rises when you are running at speed 50+ average, where is supposed that the car gets a lot of air due by the speed and nobody thinks that will be overheated.
Did you bleed the air out of the cooling system following the instructions in the factory service manual?
That's the first thing I checked, as I have had this issue before, the coolant system is not vapor locked.
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