98 expedition a/c and heat on at same time

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98 expedition a/c and heat on at same time

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Ford Forum >> Ford Trucks, Ford Vans & Ford SUV's >> Ford Expedition >> 98 expedition a/c and heat on at same time

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98 expedition a/c and heat on at same time - 7/2/2007 7:55:35 PM

heyltradesman

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Joined: 7/2/2007
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whats wrong

Post #: 1

RE: 98 expedition a/c and heat on at same time - 8/12/2008 11:29:18 PM

robert_l_ross

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Joined: 3/27/2006
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Could be a leak in the vacuum line that controls the blend door. I have a pinhole leak in mine...when I hit the AC I have to cycle the thermostat from cold to hot back to cold - when the truck is off, the vacuum line leaks when the truck is off, moving the blend door from cold to the middle. Cycling the thermostat moves the door and fixes it - but only when the engine is running (creating vacuum).

Fix - unfortunately replacing the vacuum line and that''s a b!tch to do.

(in reply to heyltradesman)

Post #: 2

RE: 98 expedition a/c and heat on at same time - 8/16/2008 8:21:58 AM

andry

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Joined: 8/8/2008
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fill the freon and waiting for about 3 weeks. if the problem come again, it means there is any leak.

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(in reply to robert_l_ross)

Post #: 3