Description
Factory Mercedes GL Class GL420 CDI Workshop Manual (2006-2009)
This is the same OEM dealer-level diagnostic and repair software used by authorized Mercedes-Benz service centers – now available to US technicians and serious DIYers working on the X164-generation GL420 CDI full-size SUV.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Petrol | N/A |
| Diesel | 4.0L OM629 V8 twin-turbo diesel (~306 hp / 700 Nm) |
| Transmissions | 7-speed 7G-Tronic automatic (722.9) |
| Drive | 4MATIC full-time AWD with transfer case |
| Model Years | 2006, 2007, 2008, 2009 |
| Badge Twins | N/A |
Common GL420 CDI Repairs Covered
| System | Procedures |
|---|---|
| OM629 Turbocharger | Twin-turbo removal, boost pressure diagnosis, intercooler inspection and replacement |
| 7G-Tronic Mechatronic Unit | Valve body and mechatronic sleeve replacement, fluid service, adaptation reset procedures |
| Air Suspension (AIRMATIC) | Compressor replacement, strut/bag service, ride-height sensor calibration |
| AdBlue / SCR Emissions | DEF injector cleaning, NOx sensor replacement, DPF regeneration and fault clearing |
Format & Delivery
Dealer software – Mercedes VMware Player virtual machine (NOT a PDF). Compatible with Windows 11, 10, 8, 7, Vista, XP, Mac, and Linux. Instant download; lifetime re-downloads.
Frequently Asked Questions
Why does the OM629 turbo system require special attention on the GL420 CDI?
The OM629 uses a sequential twin-turbo arrangement that is sensitive to oil quality and cooldown procedures. Carbon buildup on the variable-vane actuators and oil coking in the turbo feed lines are documented failure points. This software includes full turbocharger removal sequences, boost pressure test specs, and intercooler flow diagnostics to address these issues properly.
Does this software cover the 4MATIC transfer case and differentials?
Yes. Full 4MATIC all-wheel-drive system documentation is included – transfer case disassembly, front and rear differential service, driveshaft removal, and electronic traction control calibration procedures are all covered for the X164 platform.
Are wiring diagrams and electrical system diagnostics included?
Absolutely. The software features interactive, color-coded wiring diagrams for every electrical circuit – engine management, transmission control, AIRMATIC suspension, climate control, lighting, and all body control modules. Component locators identify connector positions, ground points, and splice locations throughout the vehicle.
What format is the manual?
This is professional OEM dealer software delivered as a VMware Player virtual machine – it is NOT a PDF. It runs on Windows, Mac, and Linux systems and provides the same searchable, interactive repair environment used by authorized Mercedes-Benz dealerships, including integrated diagnostic procedures and zoom-capable schematics.
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