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Pontiac of the Month

gscherer78ta's 1978 Trans Am

2019 February
of the Month

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Squall21

Over Heating

Question

My coolant level drops after a week, and when sitting in traffic it almost over heats until I move again. No idea if its leaking somewhere or evaporating. Also no heat in the winter and smell coolant when fan on.


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I'd suspect the pressurized coolant cap first. If it's loose or doesn't seal well then you might get symptoms like you described. A new cap should be under $10 and any local parts store. After that, I'd look into replacing the thermostat and checking your coolant reservoir for any signs of oil mixing in.


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You may have a small leak in the heater core. The fluid would collect up and then drain through the A/C drain onto the ground. You may only see this when the vehicle is running. Top up the fluid and run the car up to temperature. Have a good look throughout the motor. Put a piece of cardboard under the car if you cannot find anything. This may take a good 20 minutes or so just be patient.


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Can I do the thermostat myself or do I need to see my local mechanic, also already changed the coolant cap already cause it wasn't sealing properly.


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You should be able to do it on your own. Look it up on Google for your make model and year. Or in a Chilton manual if you can get your hands on the one for your model yr. Some libraries have them.

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Sounds like thermostat issues i had the same prob with my ga.

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