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:
Safety precautions when working on vehicles with Start/Stop system
WARNING
All bolts and nuts must be fully tightened according
to specifications before the vehicle is driven on public
roads.
WARNING
...
Repair instructions
Contact corrosion
Contact corrosion can occur if unsuitable fastening elements
(screws, bolts, nuts, washers) are used.
For this reason, only connecting elements with a special
surface coating have been fitted.
In addit ...
Engine oil specification
First read and observe the introductory information
and safety warnings The engine oil used must correspond exactly to specifications.
The correct engine oil is important for the function and service life of the
engine. A special high quality multigrade oil has been filled at the factory and ...
