I have replaced the radiator, water pump, thermostat, and flushed the heater core multiple times. After changing every part, the heat would work for a while, then blow cool again. The water pump was the most recent part changed, in the past week. I had great heat, but now, nothing. I don't want to keep "experimenting" with this thing. I need an ultimate fix!
My car has 165000 miles.
My car has an automatic transmission.
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