Ive been working on a 2004 grand prix. The driver ran it hot till it cut off on him. I check the heater hose come to find out the water pump wasnt working. I replaced that and it still overheats. Can someone please help me. Any suggestions????
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12-15-2012
Ive been working on a 2004 grand prix. The driver ran it hot till it cut off on him. I check the heater hose come to find out the water pump wasnt working. I replaced that and it still overheats. Can someone please help me. Any suggestions????
12-15-2012
Thermostat maybe. Cheap and easy replacement
Or a clogged radiator
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12-15-2012
I changed the thermostat a month ago.. He drove it like 10 mile with the guage in the red. Im afraid he blew the head gaskets. But the antifreeze and old hasnt mixed..
12-15-2012
Do u know for sure that the new water pump works. Never know may have got the 1 bad one from the store
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12-15-2012
Did you bleed the air out?
12-15-2012
Well its pumping.... i was thinking about changing the upper and lower intake gaskets. But i dont wanna do that if the head gaskets are blown. Is ther anyway i can check that
12-15-2012
Answer my question
12-15-2012
Test for combustion gases in the cooling system.
12-16-2012
If he ran it hot enough to get it to shut off I gotta wonder how much damage he did to the head gaskets or heads them selfs.
12-16-2012
A guy I work with was coming over to my house last weekend and his car was overheating and he kept going and blew the hg. A $100 fix turned into him needing a new head and possible motor but he just junked it. You might have a cracked/ warped head.
12-16-2012
Running it hot one time till the computer shut it down likely around 255-260 shouldnt really have done that much. Its hard to blow a headgasket on a 3800.
I think the OP needs to give us more info on what else he has done or if he has even tried to get the air out of the system.
12-17-2012
Did you bleed out the air as ffdp mentioned?... if he drove it as long as you said then I wouldn't be surprised if he blew the head gasket out.. or worse warped a head
12-18-2012
yes i bled the system ans all that came out was steam
12-18-2012
So you bleed the cooling system with the bleed screw on the thermostat housing?
Did you fill the LIM with coolant first? As in taking the thermostat out and filling it up first then put the thermostat and housing back on.
If all you got was steam, then that means there is still ALOT of air in the system. Try filling the LIM first, then getting the car up to temp then open the bleed screw 1-2 turns, just enough to get air bubbles out and then soon a steady stream of coolant. It can take 10-15 min.
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