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Message: <blockquote data-quote="maillemaker" data-source="post: 1522579" data-attributes="member: 30051">So I've had this 1995 Mustang GT about 2-3 months now, I guess.  It's in great shape for being 28 years old.  But, naturally, it's 28 years old, so things happen.Last week the air conditioner quit working.  Compressor wouldn't spin.  I took it into my usual shop, and they called and said it was working fine.  I go to pick it up after hours, no AC again.  I did some YouTube University and discovered that some people were able to get the compressor going again by bypassing the low pressure switch with a paperclip.  I figured probably the system was low on refrigerant and this was stopping the pressure switch.  So, I bypassed the LPS.  Sure enough, the compressor came on.  I hooked up an A/C Pro electric "filler upper" with a can of R134A and it was reading low, so I added a can of refrigerant.AC worked for a day and quit working again.  My assumption was that there was a serious coolant leak and now the LPS was stopping the compressor again.I actually almost replaced the CCRM.  Placed the order for it and it arrived at O'Reilly's but I decided I was going to take it in since it was probably losing coolant.  Returned the part.Took it into a different shop.  I like the shop - they have a very nice electronic comms system that texts you updates on your vehicle real-time, including pictures.  Email you your estimate that you can approve online.So the shop communicates that the AC worked fine again.  They put a gauge on it and said the system was overcharged.  Put dye in the system and said the compressor was leaking.  Price to replace compressor:  $1200.  OK, do it.They do.Get another comms from shop: We replaced compressor and now it doesn't work.  More investigation - CCRM needed replacing.  Final bill: $1600.For years now I have been threatening to get a set of gauges an learn how to crack open AC systems.  I never do because it's like a once-every-10-years project.  Could have replaced the CCRM myself for $117.Expensive lesson.</blockquote>