Automotive Air Conditioning Information Forum (Archives)

newton5 on Tue July 20, 2010 12:02 AM

Year: 1972
Make: Buick
Model: GS

I was talking to a fellow today trying to help him diagnose a problem with the above mentioned car. The conversation turned to the big muffler in the discharge line and why it shouldn't be flushed.

He asked about the internal construction of the muffler and I didn't have a good answer to give him. I've never cut one open or seen a diagram of the internals.
What's going on inside of those things?

I did cut open one "can" from a late model vehicle. It was a Chrysler product IIRC and had the high side service port on the body. It was just a hollow can though, so it was obviously not actually a muffler. I was kinda disappointed to find it empty.

TRB on Tue July 20, 2010 12:19 AM

As you can see in this model it;s a disk with a hole in the center.

http://www.autoacforum.com/messageview.cfm?catid=20&threadid=9196

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iceman2555 on Tue July 20, 2010 9:13 AM

The older vehicles did indeed have mufflers with 'baffles', however, for what ever reason....save money...most later model vehicles the muffler is simply a 'open' can type expansion chamber. One new compressor mfg'er is actually designing this 'expansion' chamber into the compressor itself.

The serious downside of the discharge muffler, it the ability to accumulate debris. Hose assemblies are one of the most overlooked items when it comes to proper flushing of the system.
Along this line, the hose assemblies should always be a part of the flush procedure or if the assembly includes a suction side filter....the assembly should be replaced.

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