The Do’s and Don’ts of Air-conditioning Compressors

The Do’s and Don’ts of Air-conditioning Compressors

Compressors are one of the most expensive parts of your vehicle’s air-conditioning system, so here are some simple tips from our technician to save you time and money when dealing with them:

  1. Don’t replace a compressor without first resolving underlying system issues or you run the risk of killing another compressor.
  2. Ensure you have the correct part number via cross referencing; our sales team will be happy to help or you can do it online at
  3. Don’t assume the compressor has the correct oil type in it. Unlike Denso’s compressors not all units are delivered as complete assemblies and insufficient lubrication due to universal oil is the second most common cause of failure.
  4. Compare the amount of oil in your new compressor against your vehicle’s data specification and depending on whether the system has been flushed or not, adjust it if necessary. 
  5. Ignoring best practice and not replacing your receiver drier at the same as your compressor is likely to be counterproductive and costly. Opening the air-conditioning system to replace a compressor leaves it susceptible to contamination, whilst old receiver driers that have potentially retained loose particles from the previous compressor failure or have reached their absorption capacity will both compromise the long term health of your new compressor.
  6. Don’t forget to vacuum the system for at least 45 minutes to remove any moisture that has got in when replacing the failed compressor.  
  7. Always follow the manufacturer’s run-in procedure – you don’t want to invalidate your warranty!

We are Europe’s leading supplier of air-conditioning parts for agricultural and construction vehicles. Search over 30,000 products by vehicle or part/OEM number on our website:

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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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