Question about 1994 Pontiac Firebird

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I just replaced my radiator after leak/overheating issue. After a couple days, my heater blows out cool air and temp goes to 240. Then, it goes back to normal again, with heat working for several minutes and starts overheating again! I have a new radiator and water pump was also replaced last year. 1996 Pontiac Firebird V6

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  • leia555 Nov 16, 2009

    Just replaced thermostat and found out that there is a leak in the intake! Not sure how much it's gonna cost yet. Saw the coolant leaking and smoking from there when engine was running. I wonder if it's time to just put her to rest and get another car?!

  • leia555 Nov 16, 2009

    Just replaced thermostat and found out that there is a leak in the intake! Not sure how much it's gonna cost yet. Saw the coolant leaking and smoking from there when engine was running. I wonder if it's time to just put her to rest and get another car?!

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Hello leia555. From the symptoms I am seeing it appears that air is in your cooling system. No heat indicates air or exhaust in your heater lines. Possibilities are it may not have been completely filled with coolant after your radiator replacement or there is a leak allowing coolant loss or the worst possibility was that damage has taken place from the previous overheating. If damage has taken place the most likely issue would be a head gasket allowing compression to displace coolant. First check to verify a full cooling system. If full, open your rad cap, when cold only, and run the engine. Coolant expands as it heats so some coolant may overflow. But look for releases of air/exhaust, careful doing this as a sudden gush may come out. Ideally the way to check this is with a tool designed to check for exhaust gases. This devise holds a solution that changes color when it comes in contact with exhaust. Hope your problem is a minor one.

Posted on Nov 15, 2009

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It sounds like the thermostat might be sticking and/or you have air in the cooling system. You might want to try and replace the thermostat if it is not new. Also make sure that you installed the correct tempature rated thermostat for your vehicle. And make sure that you have got all the air out of the system. There should be a air bleeder located on or near the thermostat housing. You will need to loosen the bleeder screw while the thermostat is open and coolant is being pumped thru the system. If there is air at the thermostat then it will take longer for it to open because the thermostat needs to have contact with the coolant to work properly. This is what it sounds like is happening to your vehicle. Let me know if you have any other questions.

Posted on Nov 15, 2009

  • muebe Nov 16, 2009

    Well an intake manifold leak repair can be expensive depending on if the head is cracked or warped where the intake manifold meets the head. Or the intake manifold might be warped or cracked. If it is warped slighty it could be machined to fix it. It probably happened when the engine originally overheated. The problem is the mechanic will not know how bad the damage is until they remove the intake manifold. I would find out how much the charge will be for the worst case senario and decide if you want to invest that kind of money to repair it.

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