Heating & A/C

Explains the operation of early and late-model 944 HVAC systems, and covers the most common malfunctions: full heat at all temperature settings and intermittent heat.

Explains automotive A/C theory of operation for expansion-valve and orifice-tube systems, provides a comprehensive symptom/cause/repair troubleshooting table, and lists normal A/C system gauge pressure readings by ambient temperature.

Step-by-step heater core removal procedure for late-model 944 and 968 without removing the dashboard, including glove box access, duct removal, and wire loom management.