Question about 1998 Ford F150 Regular Cab
Heater or a/c will switch up to defrost on its own.under moderate accell.or going up any incline with a load on eng.will switch back when throttle has backed off, or after leveling off from incline
I repaired this problem on my 1998 F150 4.6L. It had a bad vaccum line between the vaccum check valve and the vaccum storage tank. The vaccum check valve is located between the battery and the firewall. The vaccum storage tank is attached to the rear of the battery case.
Posted on Sep 10, 2008
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Posted on Jan 02, 2017
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