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[Web Creator] [LMSOFT]
VT Commodore Air Con Issues
Phoenix Mechanical
Soaring
Poor Window Demisting - Some VT's may suffer from poor or inadequate air flow from the windscreen demister ducts. Excess foam from the crash pad may be the cause, which restricts demister air flow. Excess foam should be removed. Another possible cause is the floor/demister door in the heater assembly. In some situations, the door activating gear and pivot may not mesh correctly. A revised pivot gear was introduced mid 1998.

Floor Demister door activating gear - Part number 92142452

Some VT's also have inadequate demisting during very cold conditions (5 degrees or below). In some cases, the AC Pressure Transducer may send an incorrect signal to the PCM, which disengages the AC compressor.

Air Conditioning Pressure Transducer - Part number 92142145

Whistling Dash - A whistle noise may be heard from the A/C unit when in fresh air mode and with a high fan speed. A whistle can be caused by incomplete sealing of a door flap on the A/C unit under the dash. Revised actuator rods for the door flap were introduced late 1999.


Actuator Rod - Part number 92143261

Poor Illumination Climate Control Display - Some Climate Control units have poor illumination, which can be caused by faulty globes (6 in total).

Globe and holder clear - Part number 92140515

Globe and holder green - Part number 92140514

Gen III Air Conditioning rumble - Some VT's may have a rumble type noise coming from the dash area when the Air Conditioning is on. A possible cause can be the TX valve of the Air Conditioning Unit. A revised Eaton Brand TX valve (92116220) was introduced January 2002, and a further revision was introduced in April 2002, with the use of a TGK Brand TX valve (92117402) as used in VX V6's from April 2002 onwards.

Climate Control Thud - Series II VT Berlina's and Calais' (10/1999 onwards) with Climate Control may have a light thud noise when the ignition is turned off, or intermittently, during mode changes. The cause of this noise can be the rapid closing of the previously open mode door. The rate of closure is controlled by air entry into the vacuum solenoid module. The vacuum solenoid module was revised in VT series II models, and had a 6 solenoid vacuum module assembly instead of the earlier 5 solenoid style. An additional foam pad was needed for the 6 solenoid vacuum module to reduce the thud, and is placed over the existing foam pads in the vacuum solenoid module. Revised six pack solenoids (with foam) were introduced mid 2001.

Climate Control Solenoid Foam Pad - Part number 92144689

Some early VT's with the 5 solenoid vacuum module may also suffer from similar thud noises. A vacuum delay kit was introduced to reduce thuds.

Vacuum delay kit - Part number 92144219

Insufficient Heating with Electronic Climate Control - Some Climate Control Systems may not warm the cabin effectively, even though a high temperature is selected. A possible cause can be water entering the ambient temperature sensor connector (located on the front of the Air Conditioning Condenser, just behind the front bumper). Water in the connector may short circuit the sensor, and in doing so, the Climate Control Unit believes that the outside temperature is higher than it actually is. This can cause relatively low or cool heater performance. In this situation, the connector should be dried and cleaned. Insulating grease can be applied to the connector to limit the chances of water re-entering. A revised ambient temperature sensor connector was introduced late 2000, which had improved water retention.

Ambient Temperature Sensor Repair Kit - Part number 92144967

Ambient Temperature Sensor - Part number 09152245

Air Conditioning Vibration (Gen III) - In some VT's, a vibration may be felt inside the vehicle while idling in Drive, with air conditioning on. A possible cause could be the plastic end tanks of the radiator contacting the mounting brackets on the radiator support panel. It may also be the radiator retaining clips contacting the plastic end tanks, instead of just the locating rubber. Careful bending of the support brackets will increase clearances (3mm suggested minimum clearance between mounting bracket and tank. 1mm suggested minimum clearance between retaining clips and tank).

Air Conditioning Vibration (5.0ltr V8) - Some early VT V8's may vibrate or rumble when the air conditioning is on, and the engine is around 1500rpm's. A support brace was added in late 1998 to improve compressor mounting rigidity.

A/C Compressor Brace - Part number 92078943

V6 Air conditioner compressor bearing - The air conditioning compressor pulley bearing, like any bearing, is prone to failure. When these bearings fail, the compressor will be very noisy when the air conditioning is in use. New bearings are available.

Bearing assembly - Part number VS21341

Air conditioning belt tensioner 5.0ltr V8 - The air conditioning tensioner pulley bearing can fail and seize, which increases belt heat and reduces belt grip. This can restrict air conditioning output. These pulleys should be checked if the air con output is inadequate. Belt condition and tension should also be checked.