1985 Mercury Marquis Service and Repair Manual

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Factory-Grade Data

The 1985 Mercury 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 4-Door
  • Base Wagon 4-Door
  • Brougham Sedan 4-Door
  • Brougham Wagon 4-Door

Engines covered

  • 2.3L 140Cu. In. l4 GAS SOHC Naturally Aspirated
  • 3.8L 232Cu. In. V6 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

1985 Mercury Marquis Recalls & Complaints

NHTSA #85V06800021/05/1985Component: SERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM

BRAKE BOOSTER REAR SHELLS MAY HAVE REDUCED WALL THICKNESSES WHICH COULD CAUSE THE SHELL TO BREAK.

Remedy

INSPECT AND IF NECESSARY REPLACE THE POWER BRAKE BOOSTER ASSEMBLY.

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 #50905

WIRING - ELECTRICAL DIODE IDENTIFICATION AND SERVICE REPLACEMENTS. *TW

TSB #50940

WINDSHIELD AND INTERIOR GLASS - FOG/FILM. *TW

TSB #50997

TRANSAXLE - TORQUE CONVERTER REPLACEMENT GUIDELINES AND TORQUE CONVERTER/TRANSAXLE COOLING SYSTEM CLEANING PROCEDURES - SERVICE TIP. *TW

20000909Component: TIRES:TREAD/BELT

PE 00 020/TIRE TREAD SEPARATION: RIGHT REAR TIRE EXPERIENCED A TREAD SEPARATION (TIRE WAS STILL INFLATED) WHILE TRAVELING AT 40 MPH, WITH DRIVER AND THREE PASSENGERSIN A 1985 MERCURY, MARQUIS, AFTERMA

20000826Component: POWER TRAIN:AUTOMATIC TRANSMISSION

THIS CAR HAS HAD THREE TRANSMISSION PUT IN IT THAT I KNOW OF AND SOMETHING IS STILL A WRONG WITH IT. THIS CAR HAS OTHER PROBLEM'S TO NUMEROUS TO MENTION,LIKE AIR CONDITIONER, DOOR LATCHES , REAR END A

19970910Component: ENGINE AND ENGINE COOLING:ENGINE:GASOLINE

WHILE DRIVING THE VEHICLE CAME TO A STOP AND THE VEHICLE STALLED AND SHUT OFF. THIS HAPPENS ALL THE TIME WHEN COMING TO A STOP. ONCE IT STALLS VEHICLE SHUTS OFF, VEHICLE WILL START BACK UP . INVESTIG

19970910Component: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:GAS RECIRCUL

WHILE DRIVING THE VEHICLE CAME TO A STOP AND THE VEHICLE STALLED AND SHUT OFF. THIS HAPPENS ALL THE TIME WHEN COMING TO A STOP. ONCE IT STALLS VEHICLE SHUTS OFF, VEHICLE WILL START BACK UP . INVESTIG

19961220Component: VEHICLE SPEED CONTROL

GOING UP RAMP, ENGINE LIGHT ON, MAKING LOUD NOISE, ENGINE SURGED FORWARD QUICKLY, APPLIED BRAKES TO REDUCE SPEED, GOING UP HILL, ENGINE RACED AHEAD. DID NOT TAKE TO DEALER. *AK

Showing the 5 most serious of 6 complaints filed with NHTSA.

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