PIT5200

File in Section:
Service Bulletin
Bulletin No.:
Date:
PIT5200
February, 2013
PRELIMINARY INFORMATION
Subject:
HVAC Blows Cold Due To Low System Voltage
Models:
2010 - 2012 Chevrolet Equinox
2010 - 2012 GMC Terrain
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern
Customers may comment on the HVAC system will just start blowing cold air. This condition was found on the C68
auto HVAC system. Example: Customer set temperature to 76 degrees F and while driving the HVAC changes to
cold and unable to increase temperature when moved to full hot. During diagnostic, no DTCs or possible B101E
symptom 4B. The DTC B101E is set when a temperature or mode actuator has lost is its learn position or out of
range. This concern happens when the system voltage is low.
Recommendation/Instructions
Recent field cases found the cause to be low system battery voltage due to corrosion at the starter connections.
For vehicles that exhibit this condition and when the condition is present, use GDS and select "Remote Heater and
Air Conditioning Module", select "HVAC System Data", and check the "Ignition Voltage." If voltage is less than
12 volts, inspect for signs of corrosion at the starter stud battery cable connections. Clean and recheck battery
charging voltage.
3269862
Warranty Information
For vehicles repaired under warranty use:
Labor Operation
Description
Labor Time
* N9701
Check Ignition Voltage and Clean Positive Battery Cable
Terminal at Starter
0.3 hr
*This is a unique labor operation for bulletin use only. It will not be published in the Labor Time Guide.
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.