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Running the AC compressor uses horsepower, and the truck does not have enough to overcome the loss.

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Q: Why does your expedition run worse when you turn on the air or heater?
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Heater problems on ford 1999 expedition?

the heater blows warm air when fan is on low but blows cold air when fan is turn to higher setting


Where are the heater filters in a 1999 expedition?

To the best of my knowledge, there is no heater or outside air filter on the 1999 Ford Expedition, and Grease Monkey confirmed that when my Expedition (Eddie Bauer version) was in for service.


Why do you smell antifreeze when you turn on the air conditioner?

If the heater has a sweet smell it could be that the heater core is leaking engine coolant. When the leak gets worse you will have a wet floor on the passenger side and the windshield will fog up when you turn on the defroster.


Will ac still work if you bypass the heater hoses on a 1998 ford expedition?

did the heater core start leaking? anyway you should have no problem with the air if you bypass the heater core.


1998 Mazda b2500and when you turn the heater buttom to make it blow cold air doesn't change and still on heat?

if youre trying to turn the heater on and cold air comes out, then its most likely the heater core


Antifreeze smell in air vents of 1999 expedition?

heater core, tough job.take it to a qualified auto technician


Why does your Expedition sputter only under load Air conditioner on its worse pull trailer even worse air trailer and incline wont hardly make it up?

could need a tune up.


Where is the heater control valve on a 1998 ford expedition with a 4.6L engine?

Heat control is by air flow control doors in the a/c and heater box. There is no water valve.


With heater core being bypassed would this affect the air conditioning system of the expedition?

NO. Bypass the heater core by connecting the Inlet & Outlet hoses going to the heater core together. Do not plug either hose.


Can you turn off a cabin heater in a Chrysler voyager?

Of course, set the heater/air conditioner temperature control to cold.


When you turn on a heater how does it warm you?

it warms the air particles... witch then transfer the heat to you


Does the Cabin Filter effect the air condition?

Of course it affects the air conditioning,,,it also affects the heater. Any time u have a restricted air flow it affects how heater and air conditioning works, for the worse. Engineers have designed the heater/ac system to run on clean air, so therefore your heater/ac systems work faster and better with a clean filter. Not to mention your own physical health by breathing clean air.