I have a 1998 Chrysler Cirrus. The heater alternately blows cold air and hot air, and the engine temp soars quickly then drops just as fast. I have replaced a suspect radiator cap, topped off the overflow tank, and replaced the thermostat, nothing seems to have helped much. Could it be an air bubble that ingressed either through the overflow or the faulty cap? What should I try next?
Engine temp/heater issue
Most likely an air bubble still exists. I seem to recall a bleeder on the top of the water inlet housing.( where the top hose attaches at the engine). Try bleeding the cooling system and then topping off the coolant level.
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