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 143 (HVAC SYSTEM - A/C-HEATER SYSTEM - AUTOMATIC)
1991 Mercury Tracer Base, 4D Sedan, Automatic
Section 143 (HVAC System - A/C-Heater System - Automatic)
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Section 143 (HVAC System - A/C-Heater System - Automatic)
WARNING: This page is about a different car, the 1996 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
- A/C System Specifications
- Description
- Operation
- Trouble Shooting
- Notes
- Preliminary Inspection
- Self-Diagnostic Test
- Symptom Diagnosis
- Notes
- Ambient Temperature Sensor Inoperative
- EATC System Inoperative, Intermittent or Improper Operation
- Blower Motor Does Not Run
- Blower Motor Inoperative In All Lower Speed Settings
- Blower Motor Inoperative In High Speed Setting
- Blower Motor Runs In High Speed Regardless Of Switch Setting
- Cool Air Discharge In AUTOMATIC & 90°F Setting
- Control Panel Display Does Not Switch Between °F & °C
- Control Panel Temp. Setting Is Not Retained In Memory
- Display Does Not Light, Blower Motor Off
- In-Vehicle Temperature Sensor Inoperative
- Rear Blend Door Inoperative
- Rear Blower Motor Inoperative, Intermittent Or Improper Operation
- Sunload Sensor Inoperative
- Temperature Blend Door Actuator Motor Inoperative, Intermittent Or Improper Operation
- Test "A" Temperature Blend Door Actuator)
- Test "B" (Blower Motor Inoperative)
- Test "C" (Blower Motor Runs At High Speed In All Settings)
- Test "D" (Blower Motor Inoperative In Low Speed Settings)
- Test "E" (Blower Motor Inoperative In High Speed Setting)
- Test "F" (Cool Discharge Air In Automatic & 90°F Setting)
- Test "G" Ambient Temperature Sensor)
- Test "H" (SUNLOAD Sensor)
- Test "J" Display Does Not Light - Blower Off)
- Test "K" In-Vehicle Temperature Sensor)
- Test "L" (Display Does Not Switch Between FAHRENHEIT & CELSIUS)
- Test "M" (Temperature Setting Is Not Retained In Memory)
- Test "N" (Rear Blower Motor)
- Test "P" (Rear Blend Door)
- 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.