AC Blows Warm or Poor Performance – 2020-2021 GM

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Bulletin No.: PIT5099F Published date: 06/13/2022 Preliminary Information PIT5099F AC Blows Warm or Poor Performance Models All Brand: All Model: Model Years: 2000 – 2021 VIN: from to All All All Engine: All Transmissions: Supersession Statement This PI was superseded to update Model Years. Please discard PIT5099E. The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI. Condition / Concern Customer may comment that thereA/C blows warm or they have poor A/C performance. Recommendations / Instructions When technical assistance is required and before calling GM TAC, the following information will be helpful in assisting with diagnosing the vehicle. Please have the following information available: * A/C High and Low pressures * High side sensor reading * A/C compressor duty cycle * Refrigerant solenoid valve command in HVAC data (if equipped) * Outside temperature * Humidity * Vent temperature If the unit is equipped with an Automatic HVAC system, go into the HVAC data with the scan tool and get the following readings: * Evaporator temperature sensor reading (if equipped) * Inside temperature sensor reading * Outside temperature sensor reading * Duct temperature sensor readings NOTE: Dealers should always be prepared to provide SI Doc ID(s) or Bulletin / PI #(s) when calling into GM TAC. Please follow this diagnostic or repair 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. © 2022 General Motors. All Rights Reserved.

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