Most vehicle manufacturers recommend closed loop flushing with air conditioning refrigerant as a flushing agent. A benefit of this type of flushing is there is no danger of flush contamination, since the flush agent being used is the correct refrigerant for the automotive A/C system.
Non-Approved Automotive AC flushes
Non-Approved flushes : Over the years many different liquids have been used as a non-approved flushes for A/C systems. The more common items are:
- Brake cleaner
- Carburetor cleaner
- Mineral spirits
- Penetrating oil
- R-11, R-22, R-113
Automotive AC system contamination with liquid flush agents
The use of unapproved chemical flushes can result in damage to rubber components in sealing washers , compressor shaft seals , O-rings and hoses.
Automotive A/C compressor internal damage
Unapproved chemical flushes when mixed with the auto ac compressor oil , it will alter the viscosity of the oil as well. Any material left behind in the a/c system after flushing will dilute the lubricant and cause performance issues , increased compressor noise and premature compressor failure. If compressor failure is caused by non-approved flushing agent being left behind in the a/c system it can void the compressor warranty.
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