1990 Mercury Grand Marquis Service and Repair Manual

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Factory-Grade Data

The 1990 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

  • GS Sedan 4-Door
  • LS Sedan 4-Door

Engines covered

  • 5.0L 302Cu. 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

1990 Mercury Grand Marquis Recalls & Complaints

NHTSA #90E04300130/10/1990Component: AIR BAGS:FRONTAL

THREADED INFLATOR COMPONENTS MAY HAVE BEEN DAMAGED DURING ASSEMBLY WHICH MAY ALLOW COMPONENTS TO SEPARATE WHEN INFLATOR RECEIVES A SIGNAL TO DEPLOY THE AIR BAG.

Consequence

INFLATOR COMPONENT SEPARATION ALLOWS HOT COMBUSTION GASES TO ESCAPE INTO THE PASSENGER COMPARTMENT W

Remedy

REPLACE AIR BAG MODULES CONTAINING POTENTIALLY DEFECTIVE INFLATORS.

TSB #636080

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

TSB #627747

THIS ARITLCE IS TO PROVIDE INFORMATION ON REPLACEMENT OF OLD STYLE HOOD LAMP SWITCH TO THE RVISED MECHANICAL HOOD LAMP SWITCH. *TT

TSB #623944

SOME VEHICLES MAY EXHIBIT HEATER CORE LEAKS. *SLC

TSB #623988

INFORMATION REGARDING TRANSMISSION FLUID USAGE CHARTS. *SLC

TSB #622660

THIS INFORMATION IS A SUPPLEMENT TO THE WIPER SYSTEM SERVICE INFORMATION PROVIDED IN THE WORKSHOP MANUALS. THIS SERVICE INFORMATION IS INTENDED AS AN AID TO ASSIST IN DIAGNOSIS AND REPAIR OF ERRATIC WIPER SYSTEM CONDITIONS. *TT

TSB #618546

SUBJECT REGARDING CLIMATE CONTROL - EATC - BLOWER MOTOR CONTROL SERVICE TIPS. *JB

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

Showing the 8 most recent of 36 technical service bulletins on file with NHTSA.

19951030Component: VEHICLE SPEED CONTROLCrash reported1 injured

WHILE DRIVING VEHICLE AT VERY LOW SPEED, VEHICLE WENT OPEN THROTTLE POSITION, IMPACT 12:00 POSITION SPEED UNKNOWN. TT *JB

19950411Component: VEHICLE SPEED CONTROLCrash reported1 injured

SUDDEN ACCELRATION, CAUSED LOSS OF CONTROL/ACCIDENT/INJURY. *SKD

19950324Component: VEHICLE SPEED CONTROLCrash reported1 injured

WHEN BRAKES APPLIED CAR LURCHED FORWARD. TT

19950324Component: SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTSCrash reported1 injured

BRAKE FAILURE. *AK

20050524Component: FUEL SYSTEM, GASOLINE:DELIVERYCrash reported

I EMBARKED ON A ROUTINE TRIP TO DINNER IN MY MOTHER'S 1990 MERCURY MARQUIS. I STARTED THE ENGINE WHICH IDLED NORMALLY, AS USUAL. WITH MY FOOT ON THE BRAKE, I ENGAGED THE SHIFT LEVER INTO THE R POSIT

Showing the 5 most serious of 63 complaints filed with NHTSA.

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