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Mercedes-Benz Service

Vehicle Climate Control Troubleshooting-Function-Design-Operation Current Passenger Car Models

Service Technology Guide

Daimler AG · After-Sales Engineering MB PC (GSP/TPI) · D-71032 B?blingen

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? 2011 by Daimler AG

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01/2011

Contents

b

Vehicle Climate Control - Troubleshooting-Function-Design-Operation - Current Passenger Car Models Preface

Customer reception General

1.1/1Reception protocol for vehicle climate control 1.2/1Stationary heater reception protocol 1.2/3The most common complaints 1.3/1A/C check

1.4/1Stationary heater check

1.4/7

Workshop

Climate control information in detail 2.1/1Stationary heater information in detail 2.1/20Climate control diagnostic tree 2.2/1Stationary heater diagnostic tree

2.3/1

Knowledge base

Model 164 (M-Class)

Model 164.8 (GL-Class)

Model 169/245 (A-Class/B-Class)

Model 171 (SLK-Class)

Contents

Model 203/209 (C-Class/CLK-Class)

Model 204 (C-Class/GLK-Class)

Model 207.3/4 (E-Class Coupe/Cabriolet)

Model 211/219 (E-Class/CLS-Class)

Model 212 (E-Class)

Model 215/220 (CL-Class/S-Class)

Model 216/221 (CL-Class/S-Class)

Model 221.095/195 (S-Class Hybrid)

Model 230 (SL-Class)

Model 251 (R-Class)

b Vehicle Climate Control - Troubleshooting-Function-Design-Operation - Current Passenger Car Models

Preface

b

Vehicle Climate Control - Troubleshooting-Function-Design-Operation - Current Passenger Car Models Dear Reader,

I am delighted to be able to present you with the fourth edition of the Technology Guide for Vehicle Climate Control .

To allow you to work in a more targeted manner, this guide has been updated and added to in close cooper-ation with experienced mechanics from various work-shops and trained staff from service (product support and diagnosis) and development.

Models 212 (E-Class), 207 (E-Class coupe/cabriolet) and 221.095/195 (S-Class Hybrid) have been added to this edition, while the information on existing model series has also been revised.

All of the new features and additional information have been integrated in the existing document, which now provides a full integrated overview of vehicle climate control in Mercedes-Benz vehicles.

As in the previous editions, this document provides summaries of known fault profiles and operating issues and explains these using pictures to help both service advisers and mechanics.

In combination with all of the other media available to you, such as Introduction into Service Manuals, Xentry Diagnostics (XD)/Xentry DAS, WIS and TIPS, the infor-mation in this document is intended to ensure quick, reliable diagnosis by both service advisors and mechanics to help you with your ultimate aim of performing successful and lasting repairs.

This guide should be considered as an aid for everyday use, please use it accordingly.

Yours,

Bernd Heinisch (GSP/TPI)

Daimler AG

After-Sales Engineering Interior MB PC

Preface

b Vehicle Climate Control - Troubleshooting-Function-Design-Operation - Current Passenger Car Models

Working with the Vehicle Climate Control Guide The contents of the guide are divided into two main chapters and tailored to the respective user group:- Service advisers (Chapter 1)

- Workshop (Chapter 2 and knowledge base) In order to establish this clear distinction between user groups, some information is included in both the service adviser part and in the workshop part. For the service adviser, only information important for the customer interview is included, while the mechanic in the workshop is furnished with more detailed informa-tion on diagnosis and repairs (see the introductions to the chapters for service advisers and workshops).

Ideally, both the service adviser and the workshop should use the guide. In this way all the important information from the customer can be considered during diagnosis and repair. In return, the customer can be given a competent statement concerning the cause of the complaint and the work carried out.Finally, it only remains to say that the vast majority of complaints can be processed with this guide. Due to the high level of complexity of the climate control system, however, it cannot cover every possible case.

All information was correct as of the copy deadline in December 2010 and may therefore vary from more up-to-date sources.

General

b Vehicle Climate Control - Troubleshooting-Function-Design-Operation - Current Passenger Car Models

C u s

t o m e

r

r e c e p

t

i o n 1.1/1

The information below is intended to assist you, the service adviser, in customer interviews concerning complaints about vehicle air conditioning systems. Due to the highly complex networking of mechanical and electrical components, the action of external influ-ences and the effect of subjective customer sensa-tions, there may be a wide variety of possible causes for any customer complaint. In order to allow repair work to be carried out quickly and effectively, the customer must provide a description of the complaint that is specific and as detailed as possible, and which can be incorporated into the reception protocol. In your function as a service adviser, your information about the customer's complaint forms the corner-stone of successful diagnosis and repair by the mechanic in the workshop when you forward the reception protocol together with the workshop order. The A/C check and stationary heater check help you to systematically determine the functionality of both systems without using further aids. For this reason it is advisable to conduct these checks together with the customer in the vehicle so that incorrect operation can be ruled out as the cause of the complaint (see notes in chapter "The most common complaints"). The chapter "The most common complaints" contains relevant information to assist you in interviewing the customer.

By consistently applying the aids and methods provided here, not only will you be assisting your mechanic in diagnosis and repair work, you will also be helping to rectify the customer's complaint and avoid consequential damage.

Furthermore, this procedure creates a single standard of quality for all Mercedes-Benz service partners to follow when receiving complaints and generates a uniform impression with the customer.

b Vehicle Climate Control - Troubleshooting-Function-Design-Operation - Current Passenger Car Models

C u s t o m e r r e c e p t i o n

1.1/2

Reception protocol for vehicle climate control

b

Vehicle Climate Control - Troubleshooting-Function-Design-Operation - Current Passenger Car Models C u s t o m e r r e c e p t i o n

1.2/1

Checklist for customer interviews concerning climate control complaints .

Staple to the workshop order. Information only required if not already noted on workshop order

VIN or license number or customer name or order number:Follow-up repair:No

Yes

Complaint:

Function Passenger compartment cooling/heating Controls (buttons/display)

Temperature/air distribution Fogged windows

Blower too weak/too strong/nonfunctional Button flashes constantly

Detailed description of complaint:

Duration of complaint:Operating state and ambient conditions during the complaint:

for ______________ min Constantly

Sporadically

Complaint reproducible Engine:Blower:

Weather conditions: _________________________________Outside temperature: ______________°C

No On

On Off

Off

Warm

Cold

Yes

Settings on operating unit/flap positions during complaint

(check off/note settings)

Service adviser's findings (results of A/C Check)?

Diagram to clarify settings; valid for all model series

Selected temperature:Noises Odor

Other _______________________________________________________

Left:

______°C Right:

______°C

b Vehicle Climate Control - Troubleshooting-Function-Design-Operation - Current Passenger Car Models

C u s t o m e r r e c e p t i o n

1.2/2