Blower pb
Postmaster
Joined: Apr 2001
Posts: 3,818
Likes: 3
No current to the switch is likely a blown fuse. With your other electrical problem (headlights) this would seem likely. Your owner's manual will have fuse locations listed by function they perform. Look up the one for heater blower and pull that one to see. If you have no owners manual you can usually find a location guide by doing a Google search.
FTE Community Team
Joined: Nov 2001
Posts: 1,854
Likes: 260
From: Oak Harbor, Washington
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Assuming that you have only a single blower (no auxiliary heater), the Aerostar's blower has power supplied to it via the Ign. switch, then a fuse, then the mode control switch ("OFF", "Flr", "Mix", etc.). Then power travels to the blower motor via the Dark Blue/Light Green wire.
So, first check to see if voltage present at the blower motor connector under the hood, with the key in ACC or ON.
If voltage is present at the blower, you can ground the Orange/Black wire at the blower to test the blower.
If the blower checks OK, suspect the blower switch itself, or the blower motor resistor, both of which are on the ground side of the blower circuit. If no blower operation with switch on HIGH, I would not look at the resistor until last. Check for proper ground of the blower switch.
But check the blower motor first, as it's the most likely culprit. If it goes open inside, you will never see voltage at the blower switch.
Hope this helps.
Assuming that you have only a single blower (no auxiliary heater), the Aerostar's blower has power supplied to it via the Ign. switch, then a fuse, then the mode control switch ("OFF", "Flr", "Mix", etc.). Then power travels to the blower motor via the Dark Blue/Light Green wire.
So, first check to see if voltage present at the blower motor connector under the hood, with the key in ACC or ON.
If voltage is present at the blower, you can ground the Orange/Black wire at the blower to test the blower.
If the blower checks OK, suspect the blower switch itself, or the blower motor resistor, both of which are on the ground side of the blower circuit. If no blower operation with switch on HIGH, I would not look at the resistor until last. Check for proper ground of the blower switch.
But check the blower motor first, as it's the most likely culprit. If it goes open inside, you will never see voltage at the blower switch.
Hope this helps.
Last edited by asavage; Jan 16, 2008 at 11:35 PM.
