Jeep Wagoneer Heater/AC Blower switch


Old 09-23-07, 08:01 PM
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Jeep Wagoneer Heater/AC Blower switch

We have an '86 Grand Wagoneer. Both the heater blower and AC blower are not working. Connected battery leads to heater motor and it assume it is either resistors (there are 2) or switches (this model has 2 motor switches (Htr and AC) in the dash unit.) Figured both resistors going bad was rare so focused on switches. Pulled connectors from switches and tried to show power by running Positive to each connector leads and Neg to a Grnd thru a meter...nothing shows any voltage. Then tried to connect some of the leads within wires coming to switch and could get htr motor to run and also AC to run. Have shop manual for this model, but it doesn't show wiring for this. Does anyone know how to determine if Switch is bad and how power is routed, before I order parts?? thanks...N
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Old 09-23-07, 08:18 PM
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It does sound like the control panel.

If you put power to the wiring going to the resistors, then that tells me the resistors are working.

I don't have a wiring schematic for the console, but it does sound as though that's the problem.

Ok, I found a schematic which I think is for your vehicle. It shows the A/C switch going directly to a High speed fan relay then to the fan.

Try tracking down this relay and swap it out if you got it.

Last edited by HotxxxxxxxOKC; 09-23-07 at 08:24 PM. Reason: added info.
Old 09-25-07, 09:38 AM
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Jeep Wagoneer Heater A/C blower switch

Mark, does your schematic show location of relay and direction of current and is there just one relay for both motors? There is one motor speed switch on dash, but behind it are 2 separate connector blocks. I have a schematic from an older Ford and it indicates that when A/C lever is pushed to A/C, it then closes circuit for power from A/C motor....otherwise power is received from htr motor. The way Ford worked it is that power comes from Battery to blower motor and then through 3 resistors wires then run from resistors to switch and depending on position of switch, it allows power to flow from one of the resistors (determining blower speed) and through to Ground which completes circuit. Very confusing! Can you determine if your schematic for Jeep is similar?? thanks, Neil

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