Question about 1999 Ford Expedition

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I have a 98 ford experdition and the heat will not get hot.

All of the controls on the engine is working properly. Meaning by that the temperature control is working letting me know that the motor is hot and it is time to turn the heat on. The blower is working and changing as I turn the knob for temperature control. I had the thermostat changed and the heater coil blew out in case it was plugged. I also had the control knob change and the heat still will not get hot. Please help.

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  • tcarter0719 Feb 07, 2009

    Thank You so much for the fast respond. I have been reading that it could be the water pump, radiator leaking, or even something about vacuum hoses too. I will start with the cheapest fix and move on threw the whole list. I will let you know the outcome.



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I would say that it is probably the water pump. I have run into 3 of these on these models this year. They do not overheat however when hooking flow meter up to measure the coolant flow they barely move the meter. Pulled the pump of and found the fins either loose from the pump or the fins worn out.

Posted on Feb 07, 2009

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First find the two hoses that go from the engine to the firewall and subsequently the heater core. If they are both hot, there is flow through the core. So given your statement above this leaves the control device that modulates the air temp delivered to the cab of the car. This is done by blending fresh and hot air coming from the heater core. Listen for the sound of a vacuum leak from under the dash. Most likly bad hose or bad vacuum actuator.

If Defroster controls do not change air fow to the windshield, check for vacuum supply to the whole system so look for a vacuum leak in the engine area as well,

good luck

Posted on Feb 07, 2009


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