I have a 2004 Dodge Grand Caravan, and the fan for the heater defroster is no longer working. When you put the defroster or heat up, and turn the **** for the fan on the instrument panel, nothing happens. You can feel the hot air coming through the vents, but no fan will turn on. All of the other instruments on the panel are working.

Is there a fuse specific to the fan that I need to check? I looked under the hood and in the fuse box, and didn't see a specific fuse. Or, is there something else that commonly causes this?

 

This is a very common issue. The blower motor resistor will fail, usually caused by excessive current flow through the blower motor. The blower resistor is located behind the glove box. With a test light, you should have power to the blue wire in the pin 4 position in the 6 pin connector. Then you should have power to the green wire in the 2 pin connector. That is the feed to the blower motor. It comes back into the resistor at the black wire in the 2 pin connector, if you have a bright light there, then you have no ground for the motor and the resistor has probably failed. Dark blue with a gray tracer is high speed, dark blue with violet tracer is med. high speed, dark blue with orange is med. low speed and dark blue with brown tracer is low speed. Checking those wires with the test light will let you know where it failed. There is a thermal fuse between the blower and the high speed wire and this is what likely failed, you should have power at the blue, green and black wires and nowhere else. If you have an amp meter, check the draw from the motor, if it spikes over 20 amps, it's bad. If you don't have an amp meter, replace the motor.

 

Tizzy 1

Thanks for the advice on this, it took me two days to find a resistor, but once I had it, it took about 5 minutes to fix this because of the information you provded. I really appreciate taking the time to help out, it is working great now.

 

How easy is it to replace the motor?? and what tools will i need to do this im having the same issue?

Cheers!
Brock lalonde

 

your first one is a pain. There is one bolt on the cover that can't be accessed so the cover needs to be broken to remove it. If you twist it just right, the tab for the screw breaks off and you can remove the cover. Here's the r&r info........

The blower motor is located on the passenger side of the vehicle under the instrument panel. The blower motor can be removed from the vehicle without having to remove the HVAC housing. 1.Disconnect and isolate the negative battery cable.2.Remove the passenger side cowl trim panel (Refer to 23 - Body/Interior/PANEL, Cowl Trim - Removal) .
3.Position the carpet to access the front upper screw that secures the air inlet housing Fig. 1 .4.Remove the recirculation door actuator (Refer to 24 - Heating and Air Conditioning/Controls/ACTUATOR, Recirculation Door - Removal) .5.Disconnect the blower motor wire lead connector from the blower motor resistor or power module, depending on application.6.Remove the one screw (from the top) that secures the lower air inlet housing to the upper air inlet housing.7.Remove the four screws (from the bottom) that secure the lower air inlet housing to the upper air inlet housing and the lower HVAC housing.
Fig. 1 - Lower Air Inlet Housing

1 - BLOWER MOTOR RESISTOR/POWER MODULE 2 - BLOWER MOTOR WIRE LEAD 3 - LOWER HVAC HOUSING 4 - UPPER AIR INLET HOUSING 5 - UPPER SCREW (1) 6 - LOWER AIR INLET HOUSING 7 - RECIRCULATION DOOR ACTUATOR 8 - ACTUATOR WIRE LEAD 9 - LOWER SCREW (4)
8.Push the rubber grommet through the opening in the lower air inlet housing Fig. 2.9.Route the blower motor wire lead through the opening in the lower air inlet housing and remove the lower air inlet housing from the vehicle.
Fig. 2 - Blower Motor Wire Lead Grommet

1 - BLOWER MOTOR WIRE LEAD GROMMET
10.Position the recirculation-air door as necessary to access and remove the three screws that secure the blower motor to the lower half of the HVAC housing Fig. 3 .11.Gently flex the recirculation-air door downward to gain access to remove the blower motor from the HVAC housing.
NOTE: To aid in installation, note the position of the blower motor mounting tabs prior to removal. 12.Remove the blower motor from the HVAC housing by rotating and tilting the blower motor as necessary .
Fig. 3 - Blower Motor Mounting Tabs

1 - BLOWER MOTOR 2 - RUBBER GROMMET 3 - BLOWER MOTOR CONNECTOR 4 - MOUNTING TABS