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The Water Cooler
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Auto A/C problem... 'tis the season, eh? lol
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<blockquote data-quote="_CY_" data-source="post: 1588573" data-attributes="member: 7629"><p>sooo true... my procedure is very detailed and complies with EPA regulations, which almost no shops (except dealerships) that I've been around follow. </p><p></p><p>for instance almost no one evacuates existing refrigerant. it gets vented. most don't have a recovery unit and/or simply don't use it due to extra time & expense of recovery unit. </p><p></p><p>most shops have never heard of a Dial-a-charge that dispenses refrigerant in oz or use a micron gauge. weighing small accurate charges of refrigerant is almost impossible without proper equipment. digital scales are next to worthless as hoses attached has to move, changing readings. </p><p></p><p>an integrated charging station isolates tank for a more accurate reading, but those costs thousands and still are suspect due to small charges involved. then factor all the different refrigerants and risk of contamination. makes those monster charge stations that only does one refrigerant not very cost effective. </p><p></p><p>knowing the correct amount of refrigerant is installed in your system eliminates one variable when trouble shooting. </p><p></p><p>knowing how to read gauges will give a quick health check on your system. problem is every system is different. finding out correct readings for your exact vehicle for temps can be challenging. this is where the experienced pro who works on a lot of similar AC's will know in a hurry what's normal for those conditions. then quickly determine if refrigerant is low or high or something is plugged. </p><p></p><p>too much refrigerant can be worst than not enough. too much refrigerant results in liquid getting slugged into compressor... killing it. Not enough refrigerant and AC stops working without hurting anything. repair leaks, charge and you're up and running. </p><p></p><p>here's an excellent link explaining how to read AC guages <a href="http://www.denlorstools.com/autoblog/2009/04/adding-freon-to-car-ac-gauge-readings-explained/" target="_blank">http://www.denlorstools.com/autoblog/2009/04/adding-freon-to-car-ac-gauge-readings-explained/</a></p><p></p><p>it's always best to start with a fresh charge, but most mechanics don't have the $$$ to invest in all the gear and/or are not able to charge for all the extra time involved. unless a major component is replaced like a compressor. </p><p></p><p>everything connected to AC work is equipment intensive. besides having the correct type gauges. car mfg put a wild variety of custom fittings. just hooking into AC system sometimes requires an adapter kit from Snap-on. </p><p></p><p></p><p>my AC tool kit with adapters, sling humidity meter, sniffer, clamp temp meter, orifice tool kit, micron gauge, etc. </p><p>[ATTACH=full]94229[/ATTACH]</p><p></p><p>recovery unit with a few 30lb kegs of R-22. </p><p>[ATTACH=full]94230[/ATTACH]</p><p></p><p>Vacuum pumps, 6 cfm and 4 cfm</p><p>[ATTACH=full]94231[/ATTACH]</p><p></p><p>a few different type AC gauges</p><p>[ATTACH=full]94232[/ATTACH]</p><p></p><p>Dial-a-charge </p><p>[ATTACH=full]94233[/ATTACH]</p></blockquote><p></p>
[QUOTE="_CY_, post: 1588573, member: 7629"] sooo true... my procedure is very detailed and complies with EPA regulations, which almost no shops (except dealerships) that I've been around follow. for instance almost no one evacuates existing refrigerant. it gets vented. most don't have a recovery unit and/or simply don't use it due to extra time & expense of recovery unit. most shops have never heard of a Dial-a-charge that dispenses refrigerant in oz or use a micron gauge. weighing small accurate charges of refrigerant is almost impossible without proper equipment. digital scales are next to worthless as hoses attached has to move, changing readings. an integrated charging station isolates tank for a more accurate reading, but those costs thousands and still are suspect due to small charges involved. then factor all the different refrigerants and risk of contamination. makes those monster charge stations that only does one refrigerant not very cost effective. knowing the correct amount of refrigerant is installed in your system eliminates one variable when trouble shooting. knowing how to read gauges will give a quick health check on your system. problem is every system is different. finding out correct readings for your exact vehicle for temps can be challenging. this is where the experienced pro who works on a lot of similar AC's will know in a hurry what's normal for those conditions. then quickly determine if refrigerant is low or high or something is plugged. too much refrigerant can be worst than not enough. too much refrigerant results in liquid getting slugged into compressor... killing it. Not enough refrigerant and AC stops working without hurting anything. repair leaks, charge and you're up and running. here's an excellent link explaining how to read AC guages [url]http://www.denlorstools.com/autoblog/2009/04/adding-freon-to-car-ac-gauge-readings-explained/[/url] it's always best to start with a fresh charge, but most mechanics don't have the $$$ to invest in all the gear and/or are not able to charge for all the extra time involved. unless a major component is replaced like a compressor. everything connected to AC work is equipment intensive. besides having the correct type gauges. car mfg put a wild variety of custom fittings. just hooking into AC system sometimes requires an adapter kit from Snap-on. my AC tool kit with adapters, sling humidity meter, sniffer, clamp temp meter, orifice tool kit, micron gauge, etc. [attach=full]94229[/attach] recovery unit with a few 30lb kegs of R-22. [attach=full]94230[/attach] Vacuum pumps, 6 cfm and 4 cfm [attach=full]94231[/attach] a few different type AC gauges [attach=full]94232[/attach] Dial-a-charge [attach=full]94233[/attach] [/QUOTE]
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