Volkswagen Golf Service & Repair Manual: Detecting leaks
External damage can cause leaks in the refrigerant circuit. Because a small leak will involve only small quantities of refrigerant, leaks should be checked for using an electronic leak detector or by introducing a leak detection additive to the refrigerant circuit. Electronic leak detectors can detect leakage rates of less than 5 grams loss of refrigerant per year. The leak detector should be specific to the composition of the particular refrigerant in use. For example, a leak detector for R12 refrigerant is not appropriate for R134a refrigerant because R134a refrigerant has no chlorine atoms to which the lead detector responds.)
Charge factor
There must be space both for liquid and vapour in a
container. As the temperature rises, the liquid expands. The
space occupied by the vapour becomes smaller. Eventua ...
Refrigerant machine oil
Refrigerant machine oil is miscible (approx. 20%–40%
depending on the type of air conditioner compressor and the
quantity of refrigerant) in the refrigerant. I ...
Other materials:
Checking auxiliary air heater element - Z35- with auxiliary air heater
control unit - J604-, RHD vehicles
Checking
Special tools and workshop equipment
required
Vehicle diagnostic tester with current probe 100 A -VAS
5051B/7-
Test conditions
Intake temperature less th ...
Removing and installing immobiliser reader coil -D2-, vehicles with keyless
access locking and starting system
Removing
–
Move steering wheel to rearmost and lowest position. Use the
entire range of adjustment of the steering column for this
purpose.
–
Remove lower steering column trim
→&nb ...
Removing and installing interface for entry and start authorisation system
-J965-
Note
When renewing the control unit, select
Renew function for the respective control unit in
Guided fault finding or
Guided functions mode
→ Vehicle
diagnostic tester.
The removal and insta ...
