Volkswagen Touran Service Manual: Possible Refrigerant Circuit Concerns
Test Requirements
 Note
| The A/C system is functioning correctly when the air flowing
from the instrument panel vents has a temperature of 70C
or lower. |
| Setting on Climatronic "LO". |
| Setting on A/C system "AC" on; "max"; "cold". |
| The A/C system OBD cannot find malfunctions with the Vehicle
Diagnostic Tester in "Guided Fault Finding". The measured value
block does not show any shut-off condition for the A/C
compressor (only on vehicles with "A/C system" OBD). |
|
|
|
Possible Concerns
Note
| The A/C system is functioning correctly when the air flowing
from the instrument panel vents has a temperature of 70C
or lower. |
| Setting on Climatronic "LO". |
| Setting on A/C system "AC" on; "max"; "cold". |
Note
| With all complaints marked with *. Refer to
→ Chapter "Pressures, Checking". |
| Total cooling system failure. * |
| Insufficient cooling performance at all vehicles speeds or
engine speeds. * |
| None or insufficient cooling after driving a few miles. * |
| A/C compressor, A/C Clutch -N25- or A/C Compressor Regulator
Valve -N280- are switched off by A/C Refrigerant Low Pressure
Switch -F73-, A/C Refrigerant High Pressure Switch -F118-, A/C
Pressure Switch -F129- or by A/C Control Head -E87- or
Climatronic Control Module -J255- due to excessive or
insufficient pressure. * |
| None or sharp decrease in fresh-air supply after driving
several miles (evaporator iced up). * |
| From these, the following complaints may also occur: |
| The A/C compressor makes noises |
| |
Re-tighten compressor securing bolts and compressor bracket
using a torque wrench. |
| |
Check routing of refrigerant lines; they must not touch
other components and must not be subject to strain (align if
necessary). |
| Noise (refrigerant hammer) occurring immediately after
switching on air conditioner and/or when cornering or braking: |
| |
Discharge, evacuate and charge refrigerant circuit (too much
refrigerant in circuit). |
Note
| Too much refrigerant oil in the circuit could also cause
this problem. This could occur if the amount of refrigerant oil
was not adjusted when replacing the A/C compressor. If this
occurs, flush the refrigerant circuit with refrigerant R134a.
Refer to
→ Chapter "Refrigerant Circuit, Flushing (Cleaning) with
Refrigerant R134a". |
| Drain the refrigerant from the A/C compressor. To facilitate
this, the ribbed belt pulley or magnetic clutch plate on the A/C
compressor should be rotated by hand. After flushing, the entire
quantity of refrigerant oil specified by vehicle-specific repair
manual should be added to the refrigerant circuit (50 grams
directly in the A/C compressor). |
| Water sprays out of vents (in dash panel or footwell)
although air conditioning system is otherwise functioning
properly: |
| |
Check proper routing of condensate drain; it must not be
crushed or kinked. |
| |
Check condensation drain valve, it must not be clogged by
wax or underbody sealant and must open and close properly. |
| |
Check plenum chamber cover; it must not be damaged and must
be properly installed (to stop water running into evaporator). |
| |
Check water drains in plenum chamber; they must not be
blocked (e.g. by leaves). |
|
Odor from Evaporator or Heat Exchanger?
Fishy smell
From leak at cooling system of engine or of A/C system
heater core.
...
Other materials:
Volkswagen Touran Owners Manual. Introduction
This chapter contains information on the following subjects:
→ Warning and indicator lamps
→ Start/stop system
→ Hill Hold assist
Additional information and warnings:
Volkswagen information system
Braking, stopping and parking
Batte ...
Volkswagen Touran Owners Manual. Introduction
This chapter contains information on the following subjects:
→ Washing the vehicle
→ Washing the vehicle with a high-pressure cleaner
→ Cleaning windows and exterior mirrors
→ Cleaning and changing windscreen wiper blades
→ Waxing and po ...
© 2016-2025 Copyright www.vwtouran.net | 0.0239
Concerns
Odor from the Heater and A/C Unit