- Key "OFF".
- Unplug dual function A/C Pressure Switch (ACPSW) (also known as Refrigerant Containment/Fan Function Switch).
- A/C "OFF" (to prevent chance of short circuit).
- Start engine.
ACPSW View:
- Jumper ACPSW circuit to GND circuit at the ACPSW vehicle harness connector.
- Does the high speed fan come on?
Yes -- Key "OFF". ACPSW circuit is OK. Remove jumper. Reconnect ACPSW. Go to Heating and Air Conditioning to check operation of the medium pressure function of the dual function A/C pressure switch. If OK, return to Diagnostic Routines for other possible causes.
No -- Go to X66. X66 - Check Ground Circuit to ACPSW