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AC quits when going uphill

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Old 06-13-2009, 11:25 AM
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Tom.Lapham
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AC quits when going uphill
I mean just a little bitty hill! '91 f150 4.9 - is there some switch or sensor that's getting weak? The fan will barely blow any air when the truck is going uphill now, it didn't use to be so weak...
 
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Old 06-13-2009, 11:33 AM
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Feel your defroster vents and see if its just blowing out there. Vacum lines controls the vents and might have a leak somewhere. Without vacum, everything blows out defrost vent, I think.
 
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Old 06-13-2009, 11:36 AM
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I've tried - it just doesn't blow. But it's only when under load like going up a hill.
 
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