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 MANUALSMERCURY1991TRACER BASE, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 84 (A/C-HEATER SYSTEM - MANUAL)
1991 Mercury Tracer Base, 4D Sedan, Automatic
Section 84 (A/C-Heater System - Manual)
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Section 84 (A/C-Heater System - Manual)
WARNING: This page is about a different car, the 1994 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
- A/C System Specifications
- Description
- Operation
- Fixed Orifice Tube Cycling Clutch System Evaluation
- Notes
- Insufficient Or No A/C Cooling
- Blower Motor Runs In High Speed In All Switch Positions
- Blower Motor Does Not Run In Low Or Medium Speed
- Blower Motor Does Not Run In High Speed
- A/C Clutch Circuit Diagnosis
- 1) Check System Operation
- 2) A/C Low Pressure Cut-Off Switch
- 3) Check Refrigerant Pressure
- 4) Check Voltage At A/C Low Pressure Cut-Off Switch
- 5) Check A/C Control Switch
- 6) Check Power Supply To A/C Control Switch
- 7) Check Power Supply To A/C Control Panel
- 8) Check Clutch Circuits
- 9) Check Clutch Voltage
- 10) Check Clutch Coil
- 11) Check Clutch Air Gap
- 12) Check Clutch Ground
- 13) Check Voltage At A/C Cut-Out Relay
- 14) Check A/C Cut-Out Relay
- 15) Check A/C Cut-Out Relay Operation
- Testing
- Removal & Installation
- Torque Specifications
- Vacuum Hose Diagram(S)
- Wiring Diagram
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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.