Leak detection in air-conditioning systems
Here you will find useful information and handy tips relating to leak detection in automotive air-conditioning systems.
Important safety information
The following technical information and practical tips have been compiled by HELLA in order to provide professional support to vehicle workshops in their day-to-day work. The information provided on this website is intended for use by suitably qualified personnel only.
One of the most frequent causes of functional problems in the air-conditioning system are leaks in the refrigerant circuit. These lead to an unnoticed drop in filling level and thus to a reduction in performance or even complete failure. As far as refrigerant R134a is concerned in particular, it is well known that it diffuses out of rubber pipes and connections. Since air conditioning experts cannot be sure whether there is a leak or whether the refrigerant loss is the normal loss over time, careful leak detection is a must.
The following are tested:
Three leak detection methods are recommended:
Detecting a leak in the air-conditioning system using forming gas.
LOKRING is a fast and extremely profitable repair method. Instead of having to order expensive complete pipe systems and wait for deliveries when pipes are defective, the problem can be solved on the spot – often with components still in their installation position. The LOKRING principle has proved its worth thousands of times over in air conditioning and climate technology.
It stands out thanks to nine processing advantages:
LOKRING is so airtight that there is no notable drop in pressure and no reduction in flow speed. As a backup, the surfaces of the pipe ends are wetted with LOKPREP sealing fluid. The system is permanently leak-proof at the LOKRING points. The pipe connections have been designed for a maximum rated pressure of 50 bar and a test pressure of 200 bar. They can be used in a temperature range of -50 °C to +150 °C.
The crimping tool enables the quick and secure connection of hoses and fittings. It is an ideal pressing system for both stationary and mobile use. The hydraulic hand pump included builds up the pressing effect. With a high adjustment track, just a few hand movements achieve an incredibly strong pressing power. This often allows hoses to be repaired even in their installation position. Similar to the LOKRING, the crimp system saves repair/waiting times and spare part costs. An investment that quickly pays off.