1985 Mercury Grand Marquis Service and Repair Manual
The 1985 Mercury Grand Marquis Service and Repair Manual is a practical, workshop-ready reference for maintenance, diagnostics, and repairs. Use it to troubleshoot symptoms, follow step-by-step procedures, verify specifications, and confirm wiring and connector locations before replacing parts.
Ideal for technicians and DIY owners, it supports everything from routine service to deeper mechanical and electrical work—including drivability, no-start, warning lights, overheating, brake and suspension issues, HVAC faults, and circuit testing.
Trims covered
- Base Sedan 2-Door
- Base Sedan 4-Door
- Colony Park Wagon 4-Door
- LS Sedan 2-Door
- LS Sedan 4-Door
Engines covered
- 5.0L 302Cu. In. V8 GAS OHV Naturally Aspirated
- 5.8L 5753CC 351Cu. In. V8 GAS OHV Naturally Aspirated
What’s inside
- Body
- Brakes
- Chassis Electrical
- Driveline
- Engine Cooling
- Engine Electrical
- Engine Mechanical
- Engine Performance & Emission Controls
- Fuel System
- General Information & Identification
- Heating, Ventilation, & Air Conditioning
- Hybrid & Electric Vehicle Systems
- Steering
- Suspension
- Transmission, Clutch, & Transfer Case
- Wiring Diagrams
Why this manual matters
- Faster diagnostics with system-based troubleshooting and wiring diagrams
- Clear procedures and reference sections to reduce guesswork and rework
- Helpful for maintenance planning and verifying parts/specs before repairs
CERTAIN FEDERAL-MOGUL AFTERMARKET FUEL PUMPS SOLD UNDER THE BRAND NAMES OF CARTER, ACCUFLOW, NAPA, TRUFLOW, PARTS DEPO, AND PARTS MASTER, SHIPPED BETWEEN AUGUST 2006 AND JULY 2007 FOR USE ON THE VEHIC
A LEAKING FUEL PUMP COULD CREATE A VEHICLE FIRE HAZARD.
FEDERAL-MOGUL WILL NOTIFY OWNERS AND REPLACE THE DEFECTIVE FUEL PUMPS FREE OF CHARGE. THE RECALL BE
SOME VEHICLES MAY EXHIBIT HEATER CORE LEAKS. *SLC
INFORMATION REGARDING TRANSMISSION FLUID USAGE CHARTS. *SLC
SUBJECT REGARDING CONTAMINATION FROM PRIOR TRANSMISSION CONCERNS OR EXCESS WEAR MAY BE TRAPPED IN THE TRANSMISSION FLUID COOLING SYSTEM. *TT
INFORMATION ON THE NEW FLUSH AND FILL TOOL AVAILABLE THROUGH ROTUNDA. *TT
INFORMATION REGARDING THE NEW TRANSMISSION COOLER FLUSHER- SERVICE TIP. *MJS
INFORMATION ON IDENTIFYING NON-APPROVED / ALTERNATE REFRIGERANTS WHICH COULD CAUSE SAFETY, AND PERFORMANCE CONCERNS IF INSTALLED IN FORD A/C SYSTEMS. *TT
SUBJECT ON A WIRE HARNESS TERMINAL REPAIR KIT AVAILABLE FOR REPAIRING ELECTRICAL WIRING HARNESSES. *TT
FORD MOTOR COMPANY HAS RELEASED A NEW ELECTRICAL GREASE ( F8AZ - 19G208-AA ) TO REDUCE THE POSSIBILITY OF MOISTURE CORROSION AT THE TERMINALS. *YC
Showing the 8 most recent of 21 technical service bulletins on file with NHTSA.
FUEL LINE TO THE ELECTRONIC FUEL PUMP FAILED CAUSING FUEL LEAKING RESULTING IN FIRE.
WHILE VEHICLE WAS PARKED AND NOT RUNNING IT CAUGHT ON FIRE IN THE ENGINE. *AK *JB
WHILE DRIVING, NOTICED SMOKE COMING FROM STEERING COLUMN, THEN SUDDENLY FLAMES SHOT OUT OF STEERING COLUMN.*AK
AN ELECTRICAL SHORT IN THE IGNITION SWITCH CAUSED THE STEERING COLUMN TO CAUGHT FIRE. *AK
AN ELECTRICAL SHORT OR SHOCK IN THE IGNITION SWITCH CAUSED THE STEERING COLUMN TO CAUGHT FIRE. PLEASE DESCRIBE.
Showing the 5 most serious of 29 complaints filed with NHTSA.
