05 Jeep Cherokee Question

[Hillbiehle]

At the samet ime, the thermostat fan swith only works on high and the dash lights behind this area are not working either. Assuming that there was a connection between the two problems, I checked the fuses however they were all fine. Do you think I'm dealing with two seperate issues, burnt lightbulb and broken fan swith or am I overlooking something more obvious? Thanks in advance for any help.

[Macgyver55]

Do you think I'm dealing with two seperate issues, burnt lightbulb and broken fan swith

Yes but I believe it probably has a burned out blower resistor rather than a bad switch

[Jeremy airjer W]

Just to make it clear the "fan" is in front of the motor and cools the coolant in the radiator. The blower motor is in the passenger compartment and blows air through the vents. I know its nit picky but if you call a part stores and get prices on a "fan" your not going to get the right price or part.

I agree that the blower resistor is the likely problem. The resistor (may also be referred to as the blower motor module if you have automatic HVAC) is just that a resistor. It will have resistors in series that will drop voltage to the blower motor and you get the different speeds. It is likely that the resistor for the speed just below high is the one that is burnt out. Since this resistor is used by all the lower speeds none of the lower speeds will work as well. High speed bypasses all of the resistors and supplies full voltage to the blower motor.

As far as the illumination for the HVAC control head (I assume you meant that there is no light behind the switches for the heat/a/c controls). If you have manual HVAC than the switch is on the ground side of the blower motor. There should be no connection between the blower motor speed and the illumination not working.

If you have automatic HVAC than the control head is sending an a/c voltage to the blower module and the module interprets that sets the appropriate fan speed. I don't think there would be a connection between the two but nothing is impossible.

[Hillbiehle]

Thank you both very much. I appreciate the help. It is a manual temperature control. The resistor was apparently changed, but for $10 I will try again. Unsure how difficult to change the light, but I'll take a look. Thanks again for the help.

[cm1977]

I have/had the same issues with my Jeep. The resistor (pretty sure this is what i changed) was pretty easy to fix and is located behind the glove box, it was a $15 part from the dealer. I called and told them the issue and they said I needed a certain part, looked online at a few different jeep sites and they had detailed instructions on changing it.

The HVAC lights are a common issue with the Jeeps and you have to replace the lights on the board if you can are able or get a new board and install it or get it installed. I decided I did not care enough to get them fixed at the dealership as I have just enough knowledge to put gas into it.

They are not related but both really common. If you work on your vehicle you can do both of these really easy, search sites that are for Jeep owners and you will find the answers.

Hope this helps.