I am working on a 1997 Jetta heater/air blower control. With the air condition selected, when the blower control is set at the lower blower levels the blower does not run but the air conditioning compressor operates. When the control is is set at the highest position, the blower comes on but the compressor turns off. The control switch was replaced without any help.

Where can I get circuit diagram for the heater/air circuit? I purchased a Chilton repair manual which does not include an electrical control description. I have a background in electronics so a circuit drawing will probably help a lot. Thanks Tom.