Alfa Romeo Compressor PDF Installation Instructions

Follow all Federal, State and Local Regulations. Proper A/C performance is dependent on all systems performing properly. Make certain that the engine cooling system is at peak operation, and that the cooling fan / fan clutch is operating properly. Worn belts, idlers and tensioners can cause poor cooling system performance due to belt slippage. Low voltage at the A/C clutch assembly can cause premature compressor failure. Contaminated refrigerant continues to be one of the most significant problems facing the A/C service industry today. Use a refrigerant identifier to verify that the refrigerant in the system is not contaminated with a blend refrigerant or has a high concentration of air. Replace the Filter Drier or Accumulator All Filter Driers and Accumulators contain a desiccant material.

This material is designed to absorb the moisture that has seeped into the A/C system. Moisture in an A/C system can form corrosive contaminates that will cause rapid system failure. It is very important to remove all moisture from the A/C system before charging. REPLACE OR INSPECT THE CONTROL DEVICES The orifice tube is a control and filter device for accumulator systems, and should always be replaced to ensure proper refrigerant and oil flow through the system. The thermal expansion valve is the control device for systems using a receiver/drier. It should be examined and replaced, if found to be contaminated. A Clean A/C System is Imperative When a compressor fails, tiny internal particles mix with oil and spread throughout the entire system. This contaminated oil, as well as moisture and other corrosives must be removed to avoid premature failure of the replacement compressor. Clean the entire system thoroughly with an effective cleaning agent and/or replace contaminated parts. Air alone does not remove contaminants.

Two methods used today are effective in removing oil and contaminants: (1) liquid cleaning with an effective cleaning agent Flushing with Dura Flush II or similar non-oil based flush designed specifically for automotive A/C use, is a proven method to clean A/C system components when used with a flush cylinder and pressurized air. Closed loop flushing with a power flush machine and the machine manufacturer’s approved solvent is an effective method to clean A/C system components. This cleaning method is utilized by several major OE service providers. (2) closed loop power cleaning using a refrigerant.

To ensure proper compressor lubrication, install half the required system oil in the suction side. This may require turning the compressor shaft as the oil is installed. The remaining amount of required system oil should be installed in the accumulator or low side of the system. To ensure that the front seal is lubricated and does not leak, after the oil is installed, the compressor must be placed or held with the front seal down for 1 to 3 minutes, to allow oil to coat the seal. If this seal is not lubricated before installation, refrigerant may leak.

Use only the recommended Refrigerant Type and Amount Only R12 or R134a can be used to maintain proper system performance. The correct amount of charge is critical for system efficiency and durability, because the refrigerant carries the lubricant through the system. Specifications can be found in the Capacities Guide, the under hood decal or an O.E. service manual. Tip!!! Dual A/C systems require additional refrigerant and oil, check vehicle specifications. Compressor Rotation Always rotate the compressor shaft at least 10 revolutions after the hoses are connected and prior to starting the engine. This will pump the excess liquid lubricant out of the compressor cylinders and into the system. Clutch Clutch coil voltage should be within one volt of system operating voltage. Anything less weakens the magnetic force of the clutch allowing slippage, increased heat, and failure. Clutch air gap (between hub and pulley) is important and should be checked before installation to ensure no changes have occurred during shipping and handling. Ask your suppliers for air gap specifications.

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