icefisherman Posted July 21, 2012 Share Posted July 21, 2012 I have a 2000 cavalier that needs a new/used compressor. I was told I would have to do a vacume on the system before i put in some cans of 134a. What happens if I dont. Anyone try it? Its just a commuter car so if its not going to totaly destroy something I would like to just do it. Quote Link to comment Share on other sites More sharing options...
Scott K Posted July 21, 2012 Share Posted July 21, 2012 Do it. Quote Link to comment Share on other sites More sharing options...
Eric Wettschreck Posted July 22, 2012 Share Posted July 22, 2012 In AC systems the reason for putting the system under deep vacuum is to remove air and moisture. Imagine what will happen when moisture comes in contact with the super cold refrigerant.It's your car and your call, but I'd put her under a vacuum for a couple hours or you just wasted a bunch of time and money. Quote Link to comment Share on other sites More sharing options...
Scott K Posted July 22, 2012 Share Posted July 22, 2012 Eric is correct, vacuum is used to remove moisture, and is is recommended to, but people a ton of them at home without it. Quote Link to comment Share on other sites More sharing options...
Jeremy airjer W Posted July 23, 2012 Share Posted July 23, 2012 Yup, never suck me down at home. Quote Link to comment Share on other sites More sharing options...
Whoaru99 Posted July 26, 2012 Share Posted July 26, 2012 Pressures will run high and cooling will less. Quote Link to comment Share on other sites More sharing options...
leech~~ Posted July 26, 2012 Share Posted July 26, 2012 In AC systems the reason for putting the system under deep vacuum is to remove air and moisture. Imagine what will happen when moisture comes in contact with the super cold refrigerant. It's your car and your call, but I'd put her under a vacuum for a couple hours or you just wasted a bunch of time and money. What a timely post and I agree with Eric. My AC has slowly been dying the last few days. I went down to a guy near my house that does all kinds of auto repair out of his garage. He checked my system with a gauge on the low pressure side and it was reading in the very high pressure zone. He tried to put in a can of refrigerant but since it was under so much pressure it did nothing. I ran it over to one of the Auto shops by my house and they devac the moisture out. The guy said that once you lose gas over time and build up water all you have left is the oil and water and you have to get it out and add some gas or it's not going to work! It was really nice driving home in nice cool air! It's not cheap though. About $150 bones! Quote Link to comment Share on other sites More sharing options...
irishwalleye Posted June 25, 2013 Share Posted June 25, 2013 Old topic but it looks like I have received the answer to my question.Would you guys recommend against doing the recharge myself? Quote Link to comment Share on other sites More sharing options...
Scott K Posted June 25, 2013 Share Posted June 25, 2013 Do it yourself, I have done several without any issues. Quote Link to comment Share on other sites More sharing options...
Macgyver55 Posted June 25, 2013 Share Posted June 25, 2013 Has the system ever been opened or are you just adding refrigerant?There are some pretty simple kits out there now that have an adjustable dial to set the ambient temp and it will give you a pressure range to fill to. If you are just adding they work great. If the system has been opened to atmosphere and you are doing a complete fill, I'd personally not recharge without putting a vacuum on it. Quote Link to comment Share on other sites More sharing options...
irishwalleye Posted June 25, 2013 Share Posted June 25, 2013 Haven't touched anything yet. 10 year old vehicle just not as cold as it should be. Thinking its just a recharge problem.Thanks guys Quote Link to comment Share on other sites More sharing options...
BoxMN Posted June 25, 2013 Share Posted June 25, 2013 I did a recharge myself, and know nothing it was simple as can be, and has worked so far on my '98 pickup. Good luck. Quote Link to comment Share on other sites More sharing options...
leech~~ Posted June 25, 2013 Share Posted June 25, 2013 I will say this. If you do it yourslef and it doesn't work and then you go to an Auto repair place. They wouldn't touch it as they say it screws up their vac system! Or just don't tell them you tried and see if it works without screwing up their equipment! Good Luck! Quote Link to comment Share on other sites More sharing options...
Jeremy airjer W Posted June 27, 2013 Share Posted June 27, 2013 I will say this. If you do it yourslef and it doesn't work and then you go to an Auto repair place. They wouldn't touch it as they say it screws up their vac system! Or just don't tell them you tried and see if it works without screwing up their equipment! Good Luck! As long as your using a charge with no stop leak in it than there will be no problems. Quote Link to comment Share on other sites More sharing options...
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