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1.6.10 Detecting leaks
External damage can cause leaks in the refrigerant circuit. Be‐
cause 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.)
1.7 Refrigerant machine oil
Refrigerant machine oil is miscible (approx. 20%–40% depending
on the type of air conditioner compressor and the quantity of re‐
frigerant) in the refrigerant. It circulates continuously in the circuit
and lubricates the moving parts.
Special synthetic refrigerant machine oils such as polyalkylene
glycol (PAG) oil are used in conjunction with R134a air condition‐
ing systems. This is necessary because ordinary mineral oils are
immiscible in R134a. In addition the materials of the R134a air
conditioning system could be attacked if the mixture circulated
within the refrigerant circuit under pressure and at high tempera‐
tures, or the lubricant film in the air conditioner compressor broke
down. The use of unapproved oils can lead to the failure of the air
conditioning system, so only approved oils must be used.
⇒ Parts catalogue
Type of oil for R134a in cars: PAG
Amarok 2011 ➤ , Beetle 2012 ➤ , Bora 1999 ➤ , CC 2010 ➤ , CC 2012 ➤ , ...
Air conditioning system with refrigerant R134a - Edition 10.2014
1. General notes on air conditioning systems 7
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