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.
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HOMESERVICE MANUALSFORD1991AEROSTAR VAN CARGO EXTENDED, 4.0 X, AWDREPAIR AND DIAGNOSIS (SINGLE PAGE)HEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSA/C-HEATER SYSTEM - MANUALOPERATIONREGISTER DUCTSAUXILIARY SYSTEM
1991 Ford Aerostar Van Cargo Extended, 4.0 X, AWD
Auxiliary System
1991 Ford Aerostar Van Cargo Extended, 4.0 X, AWDSECTION Auxiliary System
Auxiliary system is mounted to side wall behind driver. See Fig 2. When rear blower is in OFF position, refrigerant solenoid shuts off refrigerant flow from main system to rear evaporator.
RENDER: 1.0x
NO RELATED
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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.