blower motor
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matbec2 (04-21-2015)
#6
1994 F150 XLT 5.8L 2wd
Check the grey/yellow wire for power with the key on (it's @ the ignition harness in the column. This supplies your blower/accessories with power. If you have power there then check the HVAC selector connector on the back to test for power in and out.
EDIT:
You may also want to ensure that all of the vacuum lines on selector are in good shape, I believe that's how the system differentiates from OFF/Max/AC/Vent/Floor/Defrost. If the vac lines are bad or not getting vacuum it won't signal that it's been switched from off to a work setting. It may also be controlled with a guide wire, haven't ever dug into a 87-91, make sure that the wire is moving the selector that should be behind the glove box.
EDIT:
You may also want to ensure that all of the vacuum lines on selector are in good shape, I believe that's how the system differentiates from OFF/Max/AC/Vent/Floor/Defrost. If the vac lines are bad or not getting vacuum it won't signal that it's been switched from off to a work setting. It may also be controlled with a guide wire, haven't ever dug into a 87-91, make sure that the wire is moving the selector that should be behind the glove box.
Last edited by fltdriver; 04-22-2015 at 10:12 AM.
The following users liked this post:
matbec2 (04-22-2015)
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#8
1994 F150 XLT 5.8L 2wd
You basically need to track it back until you find power, it could be many things and you could end up replacing the entire system before you find the actual cause of the problem. You don't have power at the blower plug, so check the back of the climate control cluster. If still no power check the grey/yellow wire I mentioned earlier. If you have power at that wire then ignition switch isn't the problem. You just need to narrow down the point at which the power transfer stops.