Depending on which system you have ( Automatic Zone Control or manual control), it is probably the blower motor controller or resistor block respectively.
Thank you for your reply. I have the AZC setup and having looked under the glove compartment it looks as though the control box has been replaced at some time or another. I shall get it tested and see if this replacement is faulty. :thumbsup:
You could try to find error codes yourself with the AZC system: You most probably get 03 or 04, which has to do with the Fan control. You could clear the memory by disconnecting the car battery for a minute or so and check if the fan works ok.
ENTERING THE AZC SELF-DIAGNOSTIC MODE
To enter the AZC self-diagnostic mode, perform the following: (1) Depress the a/c and recirc buttons at the same time and hold. Rotate the left temperature control knob clockwise (CW) one detent. (2) If you continue to keep the a/c and recirc buttons depressed, the AZC control module will perform a Segment Test of the Vacuum Fluorescent (VF) display. In the Segment Test you should see all of the display segments illuminate as long as both buttons are held. If a display segment fails to illuminate, the vacuum fluorescent display is faulty and the a/c heater control must be replaced. (3) After viewing the Segment Test, release the A/C and Recirc buttons and the display will clear momentarily.
If a 0 is displayed, then no faults are set in the system. Should there be any faults, either currentor historical, all fault codes will be displayed in ascending numerical sequence (note no effort is made to display fault codes in chronological order). Each fault code is displayed for one second before the next code is displayed. Once all fault codes have been displayed, the system will then repeat the fault code numbers. This will continue until the left side set temperature control is moved at least one detent position in the CW direction or the ignition is
turned OFF
When you are in the self diagnostic mode , you can also enter into the actuator test mode. Turn the left temp knob so that pointer number 02 is shown (that one is for the Fan), and pressing the A/C or Recirc button will put the system into the actuator test mode. By turning the RH temp knob, you should be able to control the fan speed. If this works, then you know that the Fan controller is ok and that the problem is probably somewhere in the panel/switch.