Dash Climate Control Fan

[Modeler]

I have a 1993 Thor Ambassador 34' diesel pusher. The problem is with the dash climate control fan. The fan works properly at all speeds in the following positions, AC Max, AC and Vent. When Heat or Defrost buttons are pushed the fan does not run at all. The vacuum doors are moving to their proper position but no fan operation. The control is a Chysler part #4361140.

Any help in solving this problem would be appreciated.

[ga traveler]

I would think it almost has to be in the control panel. When you push the heat or defrost button, it should give power to the fan switch. I would take out the control panel and look for a broken or loose part.

[Modeler]

Thanks GA Traveler for your info. The problem has been fixed as it was a wire that had come off of the vacuum control module.