Forum Discussion

kmb1966's avatar
kmb1966
Explorer
Jul 23, 2018

Dash A/C blows out of defrost when climbing or head wind

My dash a/c blows cold air, but at times when climbing hills/overpasses or traveling in a head wind, the air will decrease out of the vents, and blow out of the defrost vents. Upon slowing down, the ...
Class A
MrWizard's avatar
MrWizard
Moderator
Jul 24, 2018
according to my ford chassis manual revised 1994 version

class A MH fuse box

fuse number 8, 15 amp. run only, for body builder add-on circuit

i have no idea what your builder used that circuit for or IF it is the correct fuse for your 2000 chassis, but load should be minimal and able to handle the extra vacuum pump
it is a place to start looking/testing

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