AC/heater not working nor is the rear window wiper

ALEXANDER GASKIN

MEMBER
2004 DODGE DURANGO
5.7L
V8
4WD
AUTOMATIC
210,000 MILES

So I recently had the vehicle stolen got it back. The temperature control was like messed with probably from the dope head that stole it, but I bought a new cluster with the rear window wiper motor, switch thermostat from hot to cold and the 3 turn nobs for fan speed which actuator of legs head or body etc. Changed that out still nothing. Checked all fuses and relays that’s I know of next going to change resistor. I do not know I’m lost. Please help.

1 Reply

KASEKENNY

MECHANIC
18,907 POSTS

We need to check for codes because either we have an issue with the HVAC control module or possibly the front control module which is part of the PDC under the hood. Basically we need to remove the rear wiper relay and check for power on pin 86. Then turn the rear wiper on and check for power across pin 86 and 85. When you turn the switch on, it grounds the relay which pulls the contact closed and sends voltage through pin 87 to 30 and down to the motor.

If you have power at 86 and then have power on 86 and 85 when you turn the switch on, jump voltage from 86 to 30 and see if the motor turns on.

As for the front HVAC controls, let's get to that after the wiper. Because if you need a FCM for the wipers then that may fix the HVAC as well. If it doesn't then we can fix the HVAC after the wipers are fixed.

Let me know this info and we can go from there. Thanks

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

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