Question about 1998 Ford Expedition

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I have a 1998 Ford Expedition and the air is not blowing properly. It blows out a warm mist when driving, but all 3 units have to be turned on HI to feel any cool. As soon as it stops or begans to slow down, it goes from warm mist, to just hot like the heat is on. The 2 rear units work ok when it does decide to blow cool, but the front unit always blows warm.

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Your evporator may have a leak or you heater core may be leaking that's the reason for the mist

Posted on Jul 24, 2009

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1998 ford expedition 4.6 liter - when air is turned on hot air blows out , compressor is working. could it be a vent malfunction? all vents work off of vacum except for one that has a motor that turns...


Sounds like it could be the blend door motor that has failed or the blend door itself is stuck or broken. If you have manual A/C controls it could also be the potentiometer(the switch that controls the heat) or if you have EATC it might be the complete head unit that needs to be replaced. More than likely it is the blend door motor that needs replacing so that would be where I'd start testing first.

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most likely the core has a tiny hole in it which will get bigger with time. it will not heal itself, you are going to have to get it replaced.

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Sounds like the thermostat is jammed, I would replace it anyhow for how much it will cost, or possibly the heater matrix, thats the small radiator inside the car behind the dash that takes the hot water in and the fan then blows the heat through the vents, this may be blocked doubtful though more likely the thermostat be careful driving the car in case it overheats and blows the gasket.

It could just be air locked, meaning if you have topped the water up lately or put anti freeze in it it has pulled some air in the water system, much like your house heating you will have to bleed it.

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Nov 11, 2009 | 1998 Ford Expedition

1 Answer

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It is most probably the problem with blend door or blend door actuator. But just in case I would suggest to follow the entire procedure:

First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is warm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest flushing the heater core.

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When they refilled the refrigerant did they put die in it to check for leaks, it sounds like there may be a leak.

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impeller is made of plastic on teh water pump and its slipping and spinning on the shaft renew before weather warms up as engine will overheat

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