BAC Forum

General Boards => Technical Support => Topic started by: Darrell Terry on October 27, 2014, 06:03:43 PM

Title: Dash AC Fan
Post by: Darrell Terry on October 27, 2014, 06:03:43 PM

While travelling this week I lost dash AC fan speed #3. Speed #1-#2 and # 4 work fine but #3 speed does not.
#3 is the one I typically use. I checked connections and under dash they appear tight.
Any advise or recommendations appreciated.

Darrell Terry
2004 Monterey/Laguna

Title: Re: Dash AC Fan
Post by: Steve Huber on October 27, 2014, 06:36:56 PM

Darrell,
Sounds like a bad fan switch. The fan speed is controlled by the amount of voltage applied. Voltage is supplied by a resistor with various taps to provide differing voltages based on the switch position. Since the fan works in 3 of 4 speed selections, the switch probably is dirty / faulty in the #3 position. Try spraying the switch with contact cleaner (make sure it is safe for plastics). That may resolve it.
Steve

Title: Re: Dash AC Fan
Post by: Dick Simonis on October 27, 2014, 07:12:59 PM

Ditto but don't overlook the possibility of a bad resistor, not an uncommon problem in some applications.

Title: Re: Dash AC Fan
Post by: Dennis Mecklenburg on October 28, 2014, 02:01:40 AM

I experienced a similar problem with my 2003 Monterey fan control and traced the wires behind the dash from the fan control and found a group of wires deep within a split loom. After opening the loom I found one of the crimp type butt connectors had not been crimped or not crimped properly. I replaced the connector, crimped the wires properly and the fan speed returned. Good luck with your search !!!