2005 Chevrolet Equinox AC Compressor Comes On When In Defrost Floor or Mix-Blend Mode - kw defogger defroster engage floor GMT191 heat hvac operation unwanted

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in the PI.

The AC Compressor comes on when in Defrost, Floor, or Mix-Blend Mode.

This is the normal operation of the AC compressor. Reference Service Information Document ID# 1387955.

Air Delivery The defrost, panel and floor actuators control air delivery. The HVAC control module controls these actuators in order to distribute airflow to a desired outlet. When the vehicle operator selects the defrost, mix-blend or floor positions, the A/C compressor clutch engages and the recirculation actuator will be moved to the outside air position. The flow of air during the various modes of operation is as follows:

Panel--Instrument panel (I/P) outlets

Bi-Level--I/P and floor outlets

Floor--Floor outlets only

Mix-Blend--Floor and defroster outlets with a slight bleed to the I/P outlets

Defrost--Defrost outlets with a small amount of air to the side window defoggers

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Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

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(05 Chevrolet Equinox)