Ac Blows Warm Or Poor Performance (PIT5099H)
Reference number: PIT5099H
Supersedes refnos: PIT5099, PIT5099A, PIT5099B, PIT5099C, PIT5099D, PIT5099E, PIT5099F, PIT5099G
AC BLOWS WARM OR POOR PERFORMANCE
TECHNICAL SERVICE BULLETIN
SERVICE INFORMATION
| Brand: | Model: | Model Year: | VIN: | Engine: | Transmission: | ||
|---|---|---|---|---|---|---|---|
| from | to | from | to | ||||
| All | All | 2000-2024 | All | All | All | All | |
Supersession Statement
This PI was superseded to update recommendation. Please discard PIT5099G.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
CONDITION / CONCERN
Customer may comment that their A/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 from actual A/C gauges.
High side sensor reading from GDS
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
Dealers should always be prepared to provide SI Doc ID(s) or Bulletin / PI #(s) when calling into GM TAC.
SERVICE INFORMATION
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.