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Old 08-12-2010, 01:51 PM
whunter's Avatar
Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,386
Why AC Compressors Fail

New owners/members.

AC Compressors diagnosis

Why AC Compressors Fail

AC Compressors Failure

Compressor Failure Analysis

Air Conditioner Compressor Failures

Diagnosing and Fixing A/C Compressor Failures

Air Conditioner Compressor Failure


Compressor Failure Modes, Symptoms and Corrections

Compressor Failure Reasons

Reciprocating Refrigeration Compressor Failure Diagnostics

Liquid Slugging:

This is a result of trying to compress liquid in the cylinders.
That liquid may be either refrigerant or oil or more likely a combination of both.
In the case of air-cooled compressor, any liquid being returned to the compressor comes directly into the cylinders.
On a suction-cooled compressor, slugging is a result primarily of refrigerant migration into the oil on the off cycle.
Upon start up the lowering of crankcase pressure causes a violent explosion that carries quantities of refrigerant and oil into the cylinders.

The results in either case are:

#1. Blown gaskets - head or valve plate gaskets
#2. Broken reeds - either or both
#3. Loose discharge valve bolts - stretching or stripping threads
#4. Broken rod or crankshaft - depending on the quantity of liquid in cylinders

Have a great day.

Last edited by whunter; 08-12-2010 at 02:07 PM.
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