Air conditioning: layout and troubleshooting
How the 944's air conditioning is laid out, where the parts sit and which faults occur.
In short: The 944 uses an expansion-valve air conditioning system. Faults range from simple refrigerant loss to the clutch, switches and air ducting. Work on the refrigerant circuit belongs in a specialist workshop.
Layout
The system uses an expansion valve (not an orifice tube). The condenser sits in front of the radiator, the receiver-drier – some with a sight glass – near the driver-side headlight on left-hand-drive cars, and the expansion valve in the passenger footwell at the firewall.
Typical faults
- Compressor not running: broken belt, broken feed to the clutch, failed coil, thermostat, or low refrigerant. A low-pressure switch cuts the clutch when refrigerant is low.
- Poor cooling: a leak, a blocked drier or a faulty expansion valve.
- Frozen evaporator: misadjusted thermostat or restricted airflow.
These fault patterns are generic and may not apply to the 944 in every case.
Refrigerant
There is no reliable information here on refrigerants or conversions. Work on the refrigerant circuit is regulated by law and belongs in a specialist workshop.
Sources
- Secondary source Air Conditioning System Operation and Troubleshooting
A/C design and troubleshooting; the author notes the generic part may not apply to the 944 in every case.