1989 Mercury Grand Marquis Service and Repair Manual

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Factory-Grade Data

The 1989 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
  • GS Sedan 4-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

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Vehicle Safety Data

1989 Mercury Grand Marquis Recalls & Complaints

NHTSA #07E06400027/08/2007Component: FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP

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

Consequence

A LEAKING FUEL PUMP COULD CREATE A VEHICLE FIRE HAZARD.

Remedy

FEDERAL-MOGUL WILL NOTIFY OWNERS AND REPLACE THE DEFECTIVE FUEL PUMPS FREE OF CHARGE. THE RECALL BE

NHTSA #96V07100025/04/1996Component: ELECTRICAL SYSTEM:IGNITION

THE IGNITION SWITCH COULD EXPERIENCE AN INTERNAL SHORT CIRCUIT.

Consequence

THIS CONDITION COULD CAUSE OVERHEATING, SMOKE, AND POSSIBLY FIRE IN THE STEERING COLUMN AREA OF THE

Remedy

DEALERS WILL REPLACE THE IGNITION SWITCH.

TSB #636080

TRANSFER SERVICE TIPS FOR THE FRONT WIPER MOTOR MOUNT BRACKET AND DEPRESSED PARK OUTPUT ARM. *TT

TSB #623944

SOME VEHICLES MAY EXHIBIT HEATER CORE LEAKS. *SLC

TSB #623988

INFORMATION REGARDING TRANSMISSION FLUID USAGE CHARTS. *SLC

TSB #616522

SUBJECT REGARDING CONTAMINATION FROM PRIOR TRANSMISSION CONCERNS OR EXCESS WEAR MAY BE TRAPPED IN THE TRANSMISSION FLUID COOLING SYSTEM. *TT

TSB #608431

INFORMATION ON THE NEW FLUSH AND FILL TOOL AVAILABLE THROUGH ROTUNDA. *TT

TSB #612203

INFORMATION REGARDING THE NEW TRANSMISSION COOLER FLUSHER- SERVICE TIP. *MJS

TSB #6090087

INFORMATION ON IDENTIFYING NON-APPROVED / ALTERNATE REFRIGERANTS WHICH COULD CAUSE SAFETY, AND PERFORMANCE CONCERNS IF INSTALLED IN FORD A/C SYSTEMS. *TT

TSB #6089681

SUBJECT ON A WIRE HARNESS TERMINAL REPAIR KIT AVAILABLE FOR REPAIRING ELECTRICAL WIRING HARNESSES. *TT

Showing the 8 most recent of 28 technical service bulletins on file with NHTSA.

19960116Component: VEHICLE SPEED CONTROLCrash reported1 injured

VEHICLE ACCELERATED ON ITS OWN WHILE STARTING THE VEHICLE. TT

20050708Component: VEHICLE SPEED CONTROLCrash reported

DT: THE CONSUMER OWNS A 1989 MERCURY GRAND MARQUIS. THE ENGINE REVVED UP WHICH CAUSED THE VEHICLE TO MOVE FORWARD WHILE HE HAD HIS FOOT ON THE BRAKE. THE FIRST TIME THIS INCIDENT HAPPENED IT DID NOT

20031105Component: POWER TRAIN:AXLE ASSEMBLYCrash reported

VEHICLE AXLE BROKE CAUSING WHEEL TO COME OFF.*MR WHILE DRIVING THE LEFT REAR AXLE BROKE AND CAUSED THE WHEEL TO COME OFF THE VEHICLE . THE VEHICLE SPUN OFF THE ROAD AND CAME TO REST IN A

20030318Component: VEHICLE SPEED CONTROLCrash reported

THE VEHICLE EXPERIENCED UNWANTED ACCELERATION, AND CRASHED INTO A TREE. *TS *JB

19960711Component: VEHICLE SPEED CONTROLCrash reported

UPON STEPPING ON GAS PEDAL, THROTTLE STUCK WIDE OPEN, CAUSING VEHICLE TO ACCELERATE OUT OF CONTROL, RESULTIN GIN AN ACCIDENT. *AK

Showing the 5 most serious of 69 complaints filed with NHTSA.

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