Reader Question: My 1997 Ford Expedition is not blowing heat through the AC. It is ice cold. I was told it might be the Thermostat.
Where do I go from here? What is your take on it? The care has actually been riding fine. Even I had been on a 400-mile trip to New Orleans without fail.
Did you read my “heater not hot” article already? See if this helps you narrow things down. If you still have problems, let me know and I will try to assist further.
Always check the coolant level INSIDE the radiator first, if its low the heater will not get hot.
I would first start with feeling your two heater hoses under the hood. If only one is hot then you have either a heater control valve problem or a restriction in the heater core itself.
If both hoses are cold, then you might have a bad thermostat or some other circulation problem in the system like a restriction in the radiator or a water pump that is not working properly, which is rare, but can happen.
If only one RADIATOR hose is hot, you could have a restriction in your radiator. With the engine HOT, run your hand down the top center of the radiator towards the bottom. If you feel a definite temperature change on the radiator, you might have a restriction in the radiator itself.
If both HEATER hoses are hot, you probably have a control problem inside the dashboard somewhere or with the dash switch.