Solstice L4-2.4L (2007)
Expansion Valve: Customer Interest
A/C - Buzzing or Growling Noise With A/C ON
Bulletin No.: 06-01-39-016C
Date: October 02, 2007
TECHNICAL
Subject:
A/C Growl or Buzzing Noise (Install Bracket Kit/Thermal Expansion Valve and/or Inspect A/C Compressor Bolts)
Models:
2006-2008 Pontiac Solstice with 2.4L Engine (VIN B - RPO LE5)
2007 Pontiac Solstice with 2.0L Engine (VIN X - RPO LNF)
2007 Saturn Sky with 2.0L Engine VIN X - RPO LNF)
2007-2008 Saturn Sky with 2.4L Engine (VIN B - RPO LE5)
2007 Opel GT
2007 Daewoo G2X
Built Prior To VIN Breakpoint 7Y122161 (For Thermal Expansion Valve)
Supercede:
This bulletin is being revised to add the Saturn SKY with the turbocharged engine, Please discard Corporate Bulletin Number 06-01-39-016B (Section
01 - HVAC).
Condition
Some customers may comment on a growling or buzzing noise when the A/C is on.
Cause
This condition may be caused by any of the following:
Cause 1 - Loose A/C Compressor Bolts
Cause 2 - Thermal Expansion Valve. Typically a buzzing noise at 1500-2000 RPM. (Vehicle built prior to VIN breakpoint 7Y122161)
Cause 3 - Evaporator Tube Assembly Lines Contacting Front of Dash Sheet Metal
Correction 1
Inspect the A/C compressor bolts and tighten, if necessary.
Correction 2 (for vehicles built prior to VIN Breakpoint 7Y122161)
Install Chassis Ears Electronic Listening Tool J 39570 on the thermal expansion valve. With A/C on and the system stabilized (run for one minute),
listen for a buzzing noise with the engine RPM between 1500-2000 RPM. Replace the thermal expansion valve if this noise is detected. Refer to Thermal
Expansion Valve Replacement in SI and install the evaporator tube bracket kit (refer to Correction 3).
Correction 3
Install the evaporator tube bracket kit.
Remove the left and right wiper arms. Refer to Wiper Arm Replacement in SI.
Remove the air inlet grille. Refer to Air Inlet Grille Panel Replacement in SI.
Remove the hood release cable from the pencil brace and, if vehicle is equipped with an automatic transmission, remove the breather tub
Remove the pencil brace.
Remove the wiper transmission assembly. Refer to Wiper Transmission Replacement in SI.
Recover the refrigerant. Refer to Refrigerant Recovery and Recharging in SI.
