It happened suddenly. The heater core was just replaced about 2300 miles ago but then I had a thermostat issue. Replaced that, then the O2 sensor went out. Fixed that, now the heat all the sudden goes out as im driving down the highway. Didnt check the hoses. The fan works though. Not overheating, fluids in everything are fine.
Thursday, December 16th, 2010 AT 5:23 PM