A/C SYSTEM MAINTENANCE - CONTINUED
RECOVERY - CONTINUED
Follow recovery station OEM instructions and recover R-134a refrigerant.
Moisture will combine with metals in the refrigerant system and this will produce highly corrosive by-
products. The by-products are oxides, iron hydroxide, and aluminum hydroxide and they will damage
the A/C system.
Moisture in the A/C system can freeze and damage the expansion valve and orifice tube. If there is
water in the system, the water must be removed by evacuation.
Failure to follow those cautions could cause equipment damage.
If replacement or repair of a component is necessary, refrigerant must be recovered from A/C system.
If A/C system has lost any charge after a long period of time, refrigerant in A/C system must be recov-
It is necessary to perform evacuating procedure to remove all air and moisture from the A/C system.
A complete charge must never be given to a system without first performing the evacuating procedure.
If the system has been left open for more than a half hour, the system has been exposed to air and mois-
ture. A new receiver/dryer must be installed.
Evacuating the A/C system with a vacuum pump will boil and remove any water in the system. Remove
water from the A/C system by evacuating the system with a vacuum pump.