My heater was working wonderfully well. Unfortunately last week, all of a sudden, there is no heat, no defrost, nothing. It's now below freezing where I live. Checked the water pump, radiator both replaced within 2 1/2 months. Not running hot .... any suggestions?
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1997 Mercury Mountaineer
Answer #1DaveJHM January 24, 2011, 22:08Master
The blower doesn't even turn on?
Do you have digital temperature control (EATC) or manual knobs?
ReplyConniemae62, January 25, 2011, 04:46Rookie
Everything works well -- turn the knobs, they work. The air is blowing out . just no warm temperature. They are manual knobs.
ReplyDaveJHM, January 25, 2011, 23:52Master
OK. Make sure your heater hose going in and the one coming out of your heater core are very hot when the engine is warm. If they are, then it's a temperature control issue inside the vehicle - the temperature blend door actuator perhaps.
If the heater hoses to the heater core are not very hot, you could have a thermostat issue for example.