Section 57 (A/C-Heater System - Manual): Description

WARNING: This page is about a different car, the 1994 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: To avoid injury from accidental air bag deployment, read and carefully follow all SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM procedures in AIR BAG article in ACCESSORIES/SAFETY EQUIPMENT section.

The A/C-heater system is a fixed orifice tube, cycling clutch type with a suction accumulator-drier and a multi-pass "S" flow evaporator core.

Fixed orifice tube and clutch cycling pressure switch control system operation. High pressure relief valve provides system protection. Pressure in excess of 450 psi (31.6 kg/cm² ) will cause pressure relief valve to interrupt voltage to compressor clutch.

System airflow is controlled by 6-port vacuum selector valve, an integral part of control panel. System air temperature is regulated by temperature blend-air door operated through self-adjusting cable.

Blower motor electrical circuit uses ground side switching with blower switch and resistor assembly on ground side of motor, not battery side. This protects resistor assembly from overheating in the event of an electrical short.

During system operation, blower motor and wheel draw air directly into system through cowl air intake in all selector knob settings except OFF and MAX A/C positions. In MAX A/C position, air flows from inside vehicle through recirculation duct. Once in system, air is blower driven through evaporator core and, depending on setting of temperature knob, through and/or around heater core and into plenum. Air is directed from plenum to defroster nozzles, demisters and floor and instrument panel registers, depending on position of function selector knob.