You should check the Original Equipment Manufacturer underhood sticker or other OEM publications.
There are several concerns that can make a compressor noisy:
Heater Core leaks and failures are usually a result of corrosion and/or erosion. This is a result of improper cleansing of the coolant system. Improper cleansing can result in electrolysis as well, which will perpetuate corrosion and erosion. When unlike metals are placed in the presence of a liquid that will carry electricity, electrolysis develops. Coolant that is contaminated and/or electrically charged will eat away at the thin skin of the aluminum, brass, or copper heater core. Corrosion and erosion can make a heater core leak in as little as a few days and repeated failures will occur until proper service is performed.
The repair is to chemically neutralize and flush the coolant system as well as use the proper coolant. There are several "Cooling System Cleaners" that can accomplish the neutralization and cleansing required to properly service the cooling system. To determine the proper coolant refer back to the OEM.
In each Four Seasons GM compressor box that requires sealing washers, a chart is provided to determine which washer should be used.
During a cold start a thermal fan clutch will engage for a short amount of time and then disengage. The fan clutch will not reengage until the air temperature coming through the radiator exceeds 180 degrees Fahrenheit. If cooling problems exist it could be the internal condition of the radiator, dirty or bent fins on the radiator or water pump problems.
For years now, the Mobile HVAC Aftermarket has been inundated with a multitude of products claiming to be a cure-all or quick fix. They have been around in many forms for numerous years and have been used by the installer base with mixed results. One such product on the market that has been receiving a lot of attention of late is "System Sealers." "Systems Sealers" are intended to seal A/C refrigeration system leaks without incurring the cost associated with proper service.
TCD offers products and/or solutions that are intended to meet or exceed the demand of the market. The company's mission is to provide its customers with a service level that is second to none and in doing so the company performs extensive research and testing on those products offered in its line. In researching sealing products, they have found that there is a considerable objection from the OE system and equipment manufacturers on the use of "System Sealers." In fact, many of these manufacturers are voiding customer's warranties should such products be found within their systems. TCD's policy regarding the use of these products is that Four Seasons DOES NOT endorse its use and will deny all claims made against defective products returned for credit that are found to have been exposed to or suspected of containing said sealers.
The company's recommendation has always been that a leaking component needs to be replaced! The company is continuing its evaluation process on the effects that "System Sealers" have on components within the A/C system. In addition, they are working closely with the manufacturers of these sealers as well as other component manufactures and industry related associations on their testing and evaluation processes in which to substantiate or refute its claims.
It's supposed that you begin by charging the system with 90% of the original equipment's refrigerant capacity. Once this has been done, begin adjusting the charge utilizing temperature differential testing. The temperature differential testing procedures can be found in Four Seasons Tips and Techniques book.
Serpentine Evaporators have one flat continuous tube with many passes. They curve back and forth like a snake the entire length of the evaporator. Plate and Fin evaporators have numerous plates that are separated by fins. The plates run the entire width of the evaporator and will be grouped in 3, 4 or 5 plates and are internally separated by baffles. The plates will have several small passes much like the serpentine. Plate and fin evaporators are the most efficient core offered today.
From about 1993 on most Chrysler vehicles use flashing AC control lights to indicate potential system problems. This could be caused by something as simple as replacing a battery or may indicate other electrical or AC system problems. A DRB (Dashboard Readout and Adjustment procedure) is used to solve this problem.