Compressor failures

SMPE talks about the problems that arise without a good flow

Published:  12 May, 2014

The refrigerant takes a small portion of the lubricant as it moves through the system. This flow of oil keeps the system working correctly. If the system has a leak, or if an internal fault prevents the flow, the compressor runs dry and ultimately fails. Air con leaks are relatively simple to diagnose, locate and fix but a considerable amount of oil can leak out in a very short time, causing a rapid and catastrophic failure.

A failed compressor often results with debris in the air con circuit which causes issues when a replacement compressor is fitted but the debris isn't addressed. Flushing out the system is a must and particular attention should be made to 'dual pass' systems, where one of the high pressure passages can be clean, giving the installer the perception that the system is clean, but the secondary circuit could be completely blocked. Correct installation of an in-line filter can help avoid this problem.

Compressors are often supplied 'virtually' dry. It is up to the installer to ensure the vehicle manufacturer's recommendations are followed. If this is neglected, once again the new pump will fail.

Related Articles

  • Get to the route of AMM problems 

    Within the complexities of modern engine management systems, Air Mass Meters (AMM) rate as one of the most difficult components to diagnose accurately. Their role is simple and their output "understandable" but the difficulties arise due to the number of other components that have an effect on their function. Couple this with the ambiguous/misleading information presented by fault codes and we start to understand the difficulties.

  • It's all in the timing 

    A job I was recently asked to look at had a bit of an odd symptom; it would run (apparently quite well), as long as the camshaft position sensor was unplugged. The previous history on the vehicle, a 2009 2.5 TDI VW Transporter, was very limited. During my initial inspection, I noticed that the vehicle was suffering from a slightly extended cranking time, which is quite normal for a cam sensor related issue, as the engine ECU cannot easily calculate which TDC is which.

  • Bearing in mind 

    Wheel bearings are a component of the vehicle where friction is detrimental to their activity. The bearing must remain free and smooth in its workings in order to ensure the wheel can rotate without impediment.

  • Staying in control 

    www.blue-print.com/gscan

  • Tools that build trust 

    Matt Lamming, Diagnostic Product Specialist at Snap-on, explains how storing and sharing vehicle fault code data can ensure repeat business


Search

Sign Up

For the latest news and updates from Aftermarket Magazine.


Poll

Where should the next Automechanika show be held?



Facebook


©DFA Media 1999-2016

Mentés