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Replaced AC compressor and that one seized too!


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ndelong
New User

Jul 2, 2008, 6:11 AM

Post #1 of 2 (1470 views)
Replaced AC compressor and that one seized too! Sign In

Make: Dodge
Model: Intrepid
Engine: 2.7L
Miles: 102,000

Hello everyone:

My A/C recently stopped working - warm air suddenly starting coming out of the vents. I immediately pulled over to check it out, and a quick look under the hood showed that when the A/C was engaged, the belt was straining and smoking and the A/C motor was turning only very slowly and sporadically. No problem when the A/C was not engaged.

I purchased an old but apparently working compressor from a salvage yard and installed it, charging the system with R134a. I used the pressure gauge built into the refrigerant bottle to charge it to the correct pressure.

It worked perfectly for about 2 weeks, but now the replaced compressor has started displaying the same behavior as the first. My questions is, did I just get unlucky and buy a bad compressor from the junkyard, or is there something else broken in my system that caused both to seize? Any help would be greatly appreciated! Thanks!


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jul 2, 2008, 7:49 AM

Post #2 of 2 (1466 views)
Re: Replaced AC compressor and that one seized too! Sign In

When a compressor seizes it causes more troubles with the system with debris. Any compressor that has an inadequate flow of refrigerant with proper oil in it will fail quickly.

If a vacuum wasn't pulled then moisture is in the system which won't behave or condense, causes PAG oils to turn acidic so it's all got to go for new.

You need to weigh in refrigerant. No gauge can tell you the charge amount just the pressure of the low side if the type that comes on the can with junk that can and will make clots if it mentioned sealer on it label. Those are best left for a last try when you will give up on having A/C at all if they don't work. Should say that on the label. They are searchable as "Death Kits" on Google!

Used or new compressor now would require driers to be replaced, O tube or TXV and a system flush, oil spread through out and new compressor pre spun with oil such that the system ends up with exacting measures of refrigerant and oil into a well held vacuum.

It's not as easy as it may seem when a compressor seizes nor cheap for the real fix,

T







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