I have a '93 Ford Aerostar that the heater barely gets warm. The temp gauge stays low. It gets up to the "N" in NORMAL then drops down and will go back and forth like this. It never seems to get above the N unless it is run a long time, shuts down for a while then it will come up above the N. But as soon as you start driving it will go back down. Is it a stuck thermostat or something else?
It seems to me that the thermostat is stuck in the open position and not allowing the water to heat up sufficiently. Try replacing it and I bet you will be nice and warm.
Bob, The Auto Answer Man
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