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Q: Coolant Resivor on 1998 Chevrolet Monte Carlo

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I just had my head gaskets replaced, thermostat and sensor, and radiator cap replaced three weeks ago. For the first time I took my car on a long drive that was freeway speed and uphill 3/4 the way. I pulled over after 35 miles and shut off my car. I heard the loud popping/gurgling sounds so I opened the hood. I saw the coolant resivor fluid was boiling and I mean boiling and was all the way to the top of the resivor. Needless to say, I discontinued my trip and returned to the shop all the while I put it in neutral most all the way to keep my engine from burning up. Weird thing is the interior gage did not show my car was overheating. The shop called me and said they drove my car up several hills for 30 miles and the coolant did not boil. They replaced the radiator cap and said that might be the problem as the one they put on may have not been heavy enough.

Can you tell me what would make the coolant in the resivor boil over, and not reflect on the interior gage it was over-heating? Plus, why wouldn't it do it again for the shop technician?
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There may have been a large air bubble in the coolant that would not let the temp sensor feel how hot the coolant really was. I would say that the shop did not do enough test driving of the car to really get out all of the Air Bubbles before they gave it back to you after the work. When I work on the cooling system, i try to keep the car over night, so I can really drive it and make sure all the air is out. It is a tricky thing, and it takes a dedicated tech.
When you pick up your car, go on a test drive like you did when your car over heated, with one of the techs, to MAKE SURE that your car is properly repaired.
hELLO , DANDD IS ABSOLUTELY CORRECT IN WHAT HE IS SAYING ,, mY QUESTION TO YOU IS , WHY DID YOU HAVE THE HEAD GASKETS REPLACED TO BEGIN WITH??? I CERTIANLY HOPE , THAT THE SHOP WHO DID THE REPAIRS HAD THE CYLINDER HEADS CHECKED FOR CRACKS , OR WARPAGE,, IF THEY DID NOT ,, THEN THEY WASTED YOUR MONEY AND THERE TIME IN DOING THE REPAIR..
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