Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
A/C-Heater System - Manual: Description
Manual A/C-heater system is a split-case design, integral blower system. Outside air is used at all times except during MAX A/C operation. Evaporator/blower assembly is mounted on engine compartment side of firewall. Heater core with plenum chamber is mounted on passenger compartment side of firewall.
Refrigerant system incorporates a 10-cylinder compressor with clutch cycling pressure switch. Clutch cycling pressure switch is connected in series with compressor clutch. Clutch cycling pressure switch is used to prevent evaporator icing during normal system operation. Compressor will operate if ambient temperature is greater than 45°F (7°C) and mode selector is in MAX A/C, NORM A/C, DEF/FLR (MIX) or DEF position.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.