Carried out at our ‘Workshop & Service Centre’ in Kettering, or we can come to you for an additional call-out fee of £25.00 within NN Postcodes.
(Please note that pricing is for cars ONLY. HGV, Plant, Agricultural, etc will be subject to additional charges.)
As you may know, the air conditioning compressors in many hybrid vehicles are operated by an electric motor instead of a drive belt.
The motor’s insulated windings are immersed in the compressor’s lubricating oil. The oils used in these compressors are formulated to have high dielectric properties, that makes them non-conductive.
Denso has recently produced a chart showing that as little as 1% contamination by improper oil can reduce the dielectric properties.
If a different type of oil gets into one of these compressors, and if the insulation on the windings has become damaged or compromised, a variety of problems may occur.
● The greatest risk is that the oil may conduct high voltage to the compressor case or connected components. A person may receive an electric shock if they touch the compressor or engine and an appropriate ground.
● Sensors in the compressor case can detect very small voltage leaks. Once a leak is detected, the control system will shut down the compressor.
Some hybrid vehicle manufacturer service bulletins suggest replacing all of the A/C system components if oil contamination has occurred.
And, some equipment used to repair R-134a systems may introduce unacceptable oil when it is also used to charge refrigerant into a hybrid vehicle with an electrically driven compressor. Residual incorrect oil may remain in the equipment’s hoses and internal plumbing, and be delivered into the hybrid vehicle during the charge process.
Over the years, equipment manufacturers have introduced new recovery/recycling/recharge (RRR) machines that are acceptable both for use on hybrid vehicles with electrically driven compressors and for use on conventional A/C systems.
These RRR machines have a separate SAE specification J2788H and are designed to prevent oil from mixing with the refrigerant during charging. J2788H machines do not have oil injection capability, thus preventing the possibility of oil being dispensed from the machine.
If an older, SAE J2210 (or a “non-H” J2788) machine is used for conventional A/C systems, it cannot be used to recharge the A/C systems on hybrid vehicles that use an electrically driven compressor.
What Work Will Be Carried Out?
An Air Conditioning service takes approximately 2 hours and consists of the following:
- Check pressures and vent temperature prior to servicing
- Check all controls including air distribution
- Analyse refrigerant, Evacuate system, measure system, Measure amount recovered. (All waste refrigerant will be recovered, and disposed of as required by the EPA Act 1990)
- Pressure test system using OFN (Oxygen Free Nitrogen), and test for leaks (If a leak in the system is found, under current UK Law we cannot re-charge with refrigerant, and this will be discussed.)
- Add correct type of oil, as recommended by the manufacturer
- Visual check of condenser
- Visual check of all hosing (routing and condition)
- Visual check of compressor and mount brackets for security of fitting
- Visual check of compressor drive belt tension/condition
- Recharge system with correct refrigerant as recommended by manufacturer
- Check vent temperature and refrigerant pressures
- Check condenser fan operation
- Check all electrics and controls
- Check drain tube, (where possible)
- Optional microbiological treatment to eliminate bad smells caused by bacteria
- Update Service Records