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Title: compressor problem Post by: cohammer on April 06, 2012, 09:06:00 pm My ideal 35 slider had a hole in the suction tube, repaired hole ,pulled a vac,held a vac for 2 days ,then put 8 oz of r 12 back in. now its not cooling and about every 5 min the suction line will frost for a few minutes and then just go back to sweating here are a couple of pictures of line and pressure , any help wanted.
Title: Re: compressor problem Post by: johnieG on April 07, 2012, 12:01:30 am be aware that just because a system holds a vacuum, it doesn't mean that there isn't still a leak, you never rely on suction to test a system for leaks, you must be able to maintain pressure,
Your symptoms are classic & indicate moisture in the system plugging the capillary tube ( thus the low suction line reading) with ice crystals, which melt, then the line frosts on the outside until the ice plugs the capillary again, then you loss freon flow & the system warms again & repeats the cycle. if the system was exposed to air/atmosphere, then you should have replaced the filter/dryer after you pressure check the system. Title: Re: compressor problem Post by: cohammer on April 07, 2012, 07:17:26 am sounds like a good possibility I think I will change the dryer and see if that does it. I am sure it had an open hole for a while.Do you recommend and certain model dryer? Thanks for the help it will give me a good start .And one other question could a 30 year old tank of freon be contaminated by rust or any thing on inside if tank?I always pull a vac and then turn every thing off and let it stay on vac for a while and see if it drops. How does every one else check for leaks?
Title: Re: compressor problem Post by: Yarochrehc on April 07, 2012, 08:34:40 pm Refrigerant doesn't go bad, leaks are usually checked with nitrogen pressure, and you should always change the filter.
Title: Re: compressor problem Post by: cohammer on April 07, 2012, 08:59:34 pm Did check for leaks with nitrogen . I changed the dryer maybe better luck this time.
Title: Re: compressor problem Post by: johnieG on April 08, 2012, 11:42:12 am You didn't say if you were just watching the pressure in the system ( I assume you are) for any loss of charge, I use nitrogen & a touch of refrigerant with a sniffer to inspect my re-work, I also use UV dye injected into the system to highlight any future leaks...
Title: Re: compressor problem Post by: cohammer on April 09, 2012, 07:21:11 am I did sniff all the joints as well as watching pressure but it still does not cool to suit me.I think I am throwing out the pancake and putting in a new compressor this may be the case a compressor from late 40 has sat idle too long with a hole on lines.
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