At AP Air we think it’s really important to share knowledge and there are few people who know as much about compressors as our Director, Ian Beswick. We asked him to answer our customers’ 5 most FAQ’s about compressors and here’s what he had to say.


Q - Why do you sell 2 types of compressor, Original and Aftermarket?

A - We want to give the customer, choice. He can fit an original oe compressor knowing he is maintaining the manufacturer’s original specifications, or if price is an issue he can fit an aftermarket compressor.


Q - How do aftermarket compressors compare?

A - AP Air has been sourcing them from high quality suppliers for over a decade and have had very few problems. Some manufacturers now factory fit this type of compressor, demonstrating the standard of quality.


Q - How often should the system be serviced?

A - A system will naturally lose gas, between 10 and 15% a year. To keep your system healthy we recommend checking the system annually and changing the receiver drier every 2 years.


Q - What are common causes for a compressor to fail?

A - Electrical problems, under/over-charging with oil/refrigerant, moisture in the system and high head pressures caused by poor airflow or a blocked condenser are common causes for compressor failure. Most of these can be avoided if they are corrected during installation and checked annually.


Q - How do I fit my compressor correctly to preserve my warranty?

A - All compressors must be installed correctly.

·      The original reason for failure must be determined and rectified.

·      The system must be flushed to remove the old oil and any debris. In systems where manufacturers are using Parallel flow condensers, or plate and fin evaporators these cannot be flushed and must be replaced!

·      The compressor clutch air gap should be checked and when the vehicle is running the compressor should receive 14.2v from the electrical system.

·      The correct amount and grade of oil put into the compressor. (Not all compressors come with oil.)

·      Receiver drier / accumulator must be replaced.

·      Expansion valve / orifice tube must be replaced.

·      Ensure the system is fully sealed and there are no leaks.

·      Perform a deep vacuum (evacuate) for a minimum of 30 minutes.

·      Charge correct amount of refrigerant.

·      Run the system for a period of time monitoring the gauges and ensuring the system is running correctly. There should be sufficient cooling in the cab.

Service & support

Industry leading knowledge backed up with the best service available.

Daily shipping

All VOR goods are shipped in the UK on a next day AM service and with our carriers predict service you know when you will receive the parts.

New arrivals

AP Air have a large range of compressors, condensers and evaporators, which are expanding daily.


With over 30 years’ experience in the agricultural market you are in good hands at AP Air.

Heavy Off Road

Being distributors of Bergstrom, RedDot & MCC, the major players in this market we are your one stop shop.


With more trucks on the road AP Air are bringing our industry leading service to this market.


AP Air Ltd.

Unit 9 & 10 Wisloe Business Park
Wisloe Road
Cambridge, Glos, GL2 7AF
United Kingdom

P: +44 1453 891 320
F: +44 1453 549 647

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