1994 Ford Aerostar Heat stop Working

1994 FORD AEROSTAR
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Heater problem
1994 Ford Aerostar 6 cyl Two Wheel Drive Automatic

My Heat all of a sudden stop Working. It went out came back on and out again. I fell some heat when am driving and pressing the gas, but when I take my foot off the heat stops. What can I do to fix it?
Jan 17, 2010 at 1:02 AM
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MERLIN2021
  • ✓Experienced Mechanic
  • 17,250 POSTS
Assuming you are talking about the temperature of the air, and not the blower motor:
Heater Core — Plugged

WARNING: The heater core inlet hose will become too hot to handle if the system is working correctly.

Check to see that the engine coolant is at the correct level.
Start the engine and turn on the heater.
When the engine coolant reaches operating temperature, feel the heater core inlet and outlet hose to see if they are hot.
If the inlet hose is not hot:

the thermostat is not working correctly.
If the outlet hose is not hot:

the heater core may have an air pocket.
the heater core may be restricted or plugged.
If both are hot, the temperature blend door in the heater plenum may be broken or stuck...
Jan 17, 2010 at 1:04 AM
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