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Contents

Wiring diagrams Section: Heating, Ventilation Air Conditioning (A4 Platform)

VAS 5051 or VAG 1551 , connecting

VAS 5051 , connecting and selecting functions

VAG 1551 , connecting and selecting functions

List of available functions

Basic Setting (function 04)

End Output (function 06)

Climatronic Control Module J255 , coding (function 07)

Read Measuring Value Block (function 08)

Table of selectable display group numbers

Heating and ventilation system, servicing

Rear footwell air duct, removing

Center air outlet - Golf/GTI, removing

Center air outlet - Jetta, removing

Drivers air outlet - Golf/GTI and Jetta, removing

Heating and ventilation controls, removing and installing

Heating and ventilation cables, installing and adjusting

Temperature flap cable, adjusting

Footwell/defroster flap cable, adjusting

Central flap cable, adjusting

Ventilation system, checking

Heating and ventilation unit, removing and installing

Fresh/Recirculating Air Door Motor V154 , removing and installing

Manual A/C system components in passenger compartment, servicing

Heating and A/C controls, removing and installing

Heating and A/C cables, installing and adjusting

Manual A/C system components in engine compartment, servicing

Climatronic components, checking and adjusting with VAS 5051

Climatronic components in passenger compartment, servicing

Footwell Outlet Temperature Sensor G192 , removing and installing

Fresh Air Blower Control Module J126 , removing and installing

Fresh Air Blower V2 , removing and installing

A/C Display Control Head E87 with Climatronic Control Module J255 , removing and installing

Air flap motors (for climate control regulation), replacing

Air Flow Flap Motor V71 , removing and installing

Temperature Regulator Flap Motor V68 , removing and installing

Central Air Flap Motor V70 , removing and installing

Footwell/defrost flap motor V85 , removing and installing

Climatronic components in engine compartment, servicing

Safety measures

Commercial designation

Color

Temperature/pressure relationship

Refrigerant oil

Airborne properties

Affects on plastic

Affects on metal

Water solubility

Flammability

Refrigerant containers

Leak detection

R-134a refrigerant oil

A/C refrigerant circuit with expansion valve and receiver drier

A/C system hoses and lines

A/C refrigerant system, replacing components

A/C Refrigerant System - Servicing

Low pressure service valve, removing

High pressure service valve, removing

A/C Pressure Switch F129 , electrical checking

A/C Pressure Switch F129 , functional checks

High Pressure Sensor G65 , checking

Checking

Expansion valve, removing and installing

Condenser, removing and installing

Heating and A/C unit, removing and installing

Evaporator inlet/outlet seal, installing

A/C refrigerant system pressures and temperatures, checking

Measuring pressure and temperature in a "switched-on" refrigerant system

Measuring pressure and temperature in a closed container or "switched-off" refrigerant system

A/C refrigerant system, discharging

A/C refrigerant system, evacuating and recharging

Requirements

Compressor noisy

A/C compressor noisy immediately after switching A/C ON and/or when driving around corners or braking (refrigerant shock), system overcharged

With an otherwise properly operating A/C system, water sprays out of instrument panel vents

A/C refrigerant system pressures, checking

A/C refrigerant system cooling performance, checking

Refrigerant (PAG) oil R-134a, distribution

A/C Compressor and Bracket

4-cylinder TDI engine

4-cylinder TDI-PD engine

Ribbed belt, routing

A/C Clutch N25 - Sanden, servicing

A/C Clutch N25 - Sanden, removing and installing

A/C Clutch N25 - Zexel, removing and installing

All sections

Flammability Volkswagen Jetta IV

Heating, Ventilation Air Conditioning (A4 Platform)

Flammability

R-134a refrigerant is not flammable.