Heater on my car quit working on Sunday, then this am on my way to work, the temp gauge went to hot. pulled over, shut off car, no steam or fluids leaking, and no hot smell. Waited a couple of hours, put about 1/2 gallon of antifreeze in car and limped it home. Temp gauge never went over half way, any idea what this is?
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You have a leak somewhere. This will cause it to have no heat and overheat. Since you put a half gallon in, and there was room for it tells me that it leaked out somewhere.
You will need to pressure test the system (using a pressure tester, pictured below)in order to determine where the leak is coming from.
Click on Image for more Details…
Until you pressure test the cooling system, make sure you keep a close eye on the coolant level and top it off often to insure no further damage is done.