Overheating.

2000PONYGIRL

MEMBER
PONTIAC GRAND AM

I own a 2000 Pontiac Grand Am SE 3.4 L. It has now 153K miles. It ran warm like 3 times in a few months period and I added coolant and was fine. Well, one time it ran warm and I could get in it and drive so I brought it on home and blew a head gasket. Well I bought the whole head gasket kit and put it in. Also while I was at it had the heads checked at a machine shop and all were fine. Well The heads checked out and got that done got it back and drove it one right and it messed up again. From their, I replaced the water pump, radiator, 3 thermastats checked the hoses, fuses everything. For some reason I can drive it like 10 miles and it be fine then it runs warm, I pull over and I hear a popping and girgling noise (coming from the overspill) I can let it cool 10 minutes crank add coolant and go 10 more miles. What might it be this time? Could anyone tell me something im missing, replies are very much appreciated!

3 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Is it a clutch or electric fan? Electric is it coming On?

Try this replace the radiator cap and bleed the cooling system ignore N/A

BLEEDING COOLING SYSTEM:

Always bleed air from cooling system after replacing coolant. Set heater for maximum heat. Remove radiator cap. Loosen drain plug and remove drain bolt (if equipped) from engine block. Drain coolant reservoir. Fill coolant reservoir to MAX mark with 50/50 water-coolant mixture. Loosen bleed bolt and fill radiator up to base of filler neck. Close bleed bolt when coolant flows out without bubbles. Tighten bleed bolt. With radiator cap removed, start and operate engine to normal operating temperature. Add coolant if necessary and check for leaks.

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Monday, October 1st, 2007 AT 11:58 PM

2000PONYGIRL

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2 POSTS

Electric Fans. One stays on and the other comes on about 225. The system has been bleed, no results their either. I know my water is leaking, but we cant find it. The radiator is good, overspill good hoses good. I can fill it up and even cool the water loses but its a slow slow steady leak.

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Tuesday, October 2nd, 2007 AT 12:04 AM

RASMATAZ

MECHANIC
75,992 POSTS

I know my water is leaking, but we cant find it. If its not being caused by a leak-then its being burn in the combustion chamber.

Try this:

Have it block and pressure tested-do the block first to pinpoint a combustion leaking into the cooling system or a gas analyzer to sniff for hydrocarbons at the radiator fill neck.

Pressure test: do not do a pressure test if there's leakage at the headgasket this might cause coolant into the cylinders and lock it up or bend a connecting rod if cranked thereafter. The headgasket should be repaired before doing the pressure test.

If the block and pressure test passes check the following: Thermostat, Pressure test the Rad. Cap, Clogged radiator, Fan clutch, Radiator electrical fan, collaspe hoses, water pump.

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Tuesday, October 2nd, 2007 AT 1:01 AM