Heater blower comes on when the ignition switch is tuned on.every time
This is on 2001 grand caravan. 3.8 engine. no automatic temperature control.
1, Turn on ignition switch. blower and the green light the heater control comes 0n.
2, Turn off heater control switch blower stops and the green light goes out,
3, Turn on ignition switch. blower and the green light the heater control comes 0n.
Also some times the AC comes on too.
Searched the caravan forum for blower switch no answer.
Thanks for your time Fred

 

Hi Fred
Welcome to Dodge Forum

I would unplug the fan speed blower resistor and see if the problem stops. Also check the connector for black marks, this means the connector is shorting to another wire.

 

Pulled blower resistor and still have the same problem. Could the problem be in the body control module or the front control module?

 

If you disconnected connector #2 at the resistor and the blower still runs, that means the dark blue/yellow wire is shorted to ground in the connector. The motor gets ground through the speed switch AFTER running through the resistor.

As to why the blower turns ON with key on, the fact that it also turns on the A/C leads me to believe you have a shorting/corrosion issue with the Intelligent Power Module