2008 Mercury Mountaineer Service and Repair Manual

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Factory-Grade Data

The 2008 Mercury Mountaineer 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 Sport Utility 4-Door
  • Premier Sport Utility 4-Door

Engines covered

  • 4.0L 245Cu. In. V6 GAS SOHC Naturally Aspirated
  • 4.6L 281Cu. In. V8 GAS SOHC 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

2008 Mercury Mountaineer Recalls & Complaints

NHTSA #07V45300026/09/2007Component: POWER TRAIN:AUTOMATIC TRANSMISSION:COOLING UNIT AND LINES

ON CERTAIN SPORT UTILITY VEHICLES EQUIPPED WITH THE 4.6L ENGINE AND 6R TRANSMISSION, THE BOLT SECURING THE TRANSMISSION OIL COOLER LINE FITTINGS AT THE TRANSMISSION MAY NOT HAVE BEEN SUFFICIENTLY TORQ

Consequence

IF LEAKING TRANSMISSION FLUID CONTACTS THE CATALYTIC CONVERTER, IT MAY POSE A RISK OF FIRE.

Remedy

DEALERS WILL INSPECT AND HAVE THE TRANSMISSION COOLER LINE ATTACHMENT BOLT TIGHTENED FREE OF CHARGE.

NHTSA #07E10400011/12/2007Component: VISIBILITY:GLASS, SIDE/REAR

CERTAIN CURVED TEMPERED REPLACEMENT GLASS MANUFACTURED BY HANGZHOU SAFETY GLASS LTD AND SUPPLIED TO SAFELITE BY AUTO TEMP INC., IDENTIFIED AS DOT-430, AND SOLD FOR USE ON CERTAIN DOMESTIC AND FOREIGN

Consequence

IN THE EVENT OF A VEHICLE CRASH, THE OCCUPANT(S) MAY BE SERIOUSLY INJURED BY SHATTERED GLASS.

Remedy

SAFELITE WILL NOTIFY ITS RETAIL CUSTOMERS AND REPLACE THE GLASS FREE OF CHARGE. RETAIL CUSTOMERS CAN

TSB #10254138

All accessory stick-on keyless entry keypads come with a wallet card containing the master code. If the accessory keypad was factory installed, this card will be placed in the glove box and should be handed to the vehicles owner during ini

TSB #10243490

When performing any transmission fluid changes or topoffs involving MERCON SP, MERCON LV has replaced all versions of MERCON SP and can be used going forward. Mixing MERCON LV and MERCON SP in the same transmission is acceptable. After 30-J

TSB #10156863

Some 2000 and newer Ford, Lincoln and Mercury vehicles equipped with aluminum body panels may exhibit corrosion concerns appearing as bubbled and/or peeling paint with or without accompanying white dust. Panel replacement is recommended. Fo

TSB #10155551

Some 2000 and newer Ford, Lincoln and Mercury vehicles equipped with aluminum body panels may exhibit corrosion concerns appearing as bubbled and/or peeling paint with or without accompanying white dust. Panel replacement is recommended. Fo

TSB #10148819

This SKU is a front upper ball joint. The Customer communication requested return of unsold inventory to inspect for ball studs with excessive rotational friction in the ball joint assembly. Excessive friction in the ball joint assembly may

TSB #10143079

Various vehicles equipped with a 4.6L, 5.4L, 6.8L modular 3 valve engine built on or before 8-Jan-2016 may exhibit symptoms that may include upper end engine noise, rough running, misfire and/or engine damage. If diagnosis leads to only cam

TSB #10140323

The Accessory (Wireless) Keyless Entry Keypad can only be used with vehicles that are factory built with Remote Keyless Entry (RKE). The master code for the Accessory (Wireless) Keyless Entry Keypad can be retrieved from FMCDealer - Parts a

TSB #10138524

The Accessory (Wireless) Keyless Entry Keypad can only be used with vehicles that are factory built with Remote Keyless Entry (RKE). The master code for the Accessory (Wireless) Keyless Entry Keypad can be retrieved from FMCDealer - Parts a

Showing the 8 most recent of 21 technical service bulletins on file with NHTSA.

20160906Component: POWER TRAINCrash reported

TL* THE CONTACT OWNS A 2008 MERCURY MOUNTAINEER. WHILE IN PARK AND TURNED OFF, THE VEHICLE ROLLED FORWARD AND COLLIDED WITH ANOTHER VEHICLE. THERE WERE NO WARNING INDICATORS ILLUMINATED OR INJURIES. A

20120620Component: SEATS:FRONT ASSEMBLY:POWER ADJUSTCrash reported

WHILE DRIVING ON A LONG TRIP, WITHOUT WARNING, THE MEMORY SEATS CHANGE SEAT SETTING AND WENT BACK FULLY AS IF I SHUT THE VEHICLE OFF, THIS HAPPENED SEVERAL TIMES WHILE I WAS DRIVING WITHOUT MY ASSISTA

20120620Component: ELECTRICAL SYSTEM:IGNITIONCrash reported

WHILE DRIVING ON A LONG TRIP, WITHOUT WARNING, THE MEMORY SEATS CHANGE SEAT SETTING AND WENT BACK FULLY AS IF I SHUT THE VEHICLE OFF, THIS HAPPENED SEVERAL TIMES WHILE I WAS DRIVING WITHOUT MY ASSISTA

20090209Component: ELECTRICAL SYSTEMCrash reported

TL*THE CONTACT OWNS A 2008 MERCURY MOUNTAINEER. WHEN THE CONTACT STARTED THE IGNITION, THE DOME LIGHT ILLUMINATED UNEXPECTEDLY. THE FAILURE OCCURRED INTERMITTENTLY AND THE DOME LIGHT WOULD NOT DIM A

20250903Component: ENGINE AND ENGINE COOLING

The contact owns a 2008 Mercury Mountaineer. The contact stated that the check engine warning light was illuminated. The contact stated the vehicle stalled while driving at an undisclosed speed. The c

Showing the 5 most serious of 156 complaints filed with NHTSA.

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