I have a 2001 chysler grand voyager the heater blower doesnt work the control panel lights up you can turn the heat up and down not a problem the relays are fine i have changed them over from front to back rear blower working fine there is a resistor at the back of the glove box i have been told this could be the problem or is it the heater motor e.dunne@hotmail
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The rear blower and the brake lights might not be related troble. The rear blower has a ballast resistor that can fail and it's next to the blower motor in the rear heater housing. The blower motors are also known to go bad so wrapping on it with it turned on might( wake it up) and it'll start woring again as a poor connection shaken or the worn motors brushes shaken down where they make connection again. Then you say the rest of the lights work do you mean that the brake light bulbs come on with the hazard swich entergized? or do the rear lights just light yellow turn lights only? I'd check or even replace the brake light buld=bs before I'd do anything else.their are other things that don't work if the fuses were involved and the same goes for the heater rear blower as the front blower uses the same fuse.
The fuses for ther front blower are in the underhood fuse relay panel. #10 fuse is a 40 amp and it's turned on by the font blower motor relay in the center of the under hood fuse realy panel. the dianostics can by addressed with a scanner and the contoll can be reset with pushing a series of buttons on the heater control panel. Most shops don't have a scanner that's involved enough the address and body control module of a chysler corporation vehical. The blowers themselves fail often as rainwater gets in them and they rust out. Before test or even looking for the contro; systems just unplug the blower motor and test for power at the motor wires with a test light. You need the power to be on ( Key on and the engine running) The other wire connected to the motor needs to be tested for ground too. But if you have power and ground and the motor doesn't run beat on the motor to see if it'll start. and if you known you've got the power and the ground your changing the motor ( the common problem)
you have a blower motor resistor/power module causing the problem. drop the glovebox door all the way down look to your right and the back of the plug will be looking at you. remove 2 screws and replace part with new part. be sure before you start to remove the ground wire off the battery.
(check water/ antifreeze level first, make sure it's full, low water can cause it not to heat properly) it could possibly be either the thermostat- fairly cheap and easy to fix, great for DIY's- if that doesn't fix it, it could be heater core.