Hey, my brother has a 98 intrepid. The ac/heat fan blows on high all the time. The speed dial does nothing. Even if the air is turned off it still blows on high. I unplugged the control unit from the dash and it still blows. Any ideas? It's the fancy control with the digital controls. Thanks everyone.

 

Blower motor resistor. I'm not real sure where it is located on the Intrepid, but on my Caravan as well as Dakota, it's on the passenger side firewall in the engine bay. Very easy to replace...probably only costs $20.

Well, so much for guessing...I just checked the tech manual and it says the resistor block is located on the HVAC unit itself, under the dash on the passenger side.

 

Thanks for the help. Sorry I couldn't be here for a few days. You wouldn't know to get to it would you? Also, I know the resistor controls the speed of the fan, but wouldn't it still turn off?

 

Hmmm, good question. I'm not sure if it would turn off or not. I guess the problem could be with the fan control switch itself, but it's easiest and cheapest to start with the resistor pack. I believe all you have to do is take off the lower dash panel on the passenger side and you should be able to see it. There are packs on Ebay for about $20. If you replace it and the problem is still there, then I'd say it's the fan switch, which is much more expensive and a lot more difficult to get to.

 

There is a procedure for calibrating the hvac which will give you codes. The high heat / full fan condition is the failsafe position which might indicate that the BCM is not getting a signal from something important. Since you have the automatic control, your "resistor pack" is actually a PWM controller that doesn't burn out as much but costs over $100. Still in the same place though.

TROUBLE CODES FROM THE ATC HEAD
The trouble codes can be checked with the ATC control if a DRBIIIt scan tool is not available. The control head can only be placed into the diagnostic mode while the engine is running and the vehicle is not moving. Set the control to a 75° F setting (so there is no confusion with the 23-51 Diagnostic Trouble Codes (DTC’s) (Fig. 1). To place the system into it’s diagnostic mode, press and hold the Floor, Mix and Defrost buttons (at the same time). The ATC head display will begin to blink. Release the Floor, Mix and Defrost buttons. Once the control head enters the diagnostic mode, the display on the control head will continue to blink. This occurs until it completes its tests and climate control unit door/actuator calibrations.