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The Water Cooler
General Discussion
Auto A/C problem... 'tis the season, eh? lol
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<blockquote data-quote="_CY_" data-source="post: 1587572" data-attributes="member: 7629"><p>lots of advice ... there's been bad and good advice already given. someone not experienced in HVAC would have a hard time telling which one is correct. </p><p></p><p>4play is right on the money. it's worth reading twice.</p><p></p><p>HVAC work is very equipment intensive, combined with knowing specific model quirks. </p><p>definitely one of those times, taking it to a pro is best. </p><p></p><p>not necessarily to dealership. where you get nailed big time is cost of new OEM parts. A job that cost say $275 at a reputable mechanic, becomes $1,000+ at the dealership. </p><p></p><p>right now the best information is a referral to an honest mechanic in your area.</p><p></p><p>-----------------------</p><p>below is how I would fix it </p><p></p><p>1. since I'm not familiar with that model. I'd find a forum that specifically deals in Tahoe repairs. all the common issues related to AC will be probably sticky. chase down all common issues first before doing below. Some Pro's will pay for an AllData subscription. </p><p></p><p>2. start by doing a basic check to see when/if compressor is coming on. </p><p></p><p>3. finding the leak... pump down system with a recovery unit. </p><p></p><p>4. pump it full of nitrogen, test with soapy water. any leaks will show bubbles. slow leaks gets a shot of refrigerant followed by a sniffer with heated LED tip. </p><p></p><p>5. fix leaks if any </p><p></p><p>6. attach a micron gauge with a vacuum pump. if system holds at least 450 microns after it stabilizes, then your system is fairly tight. </p><p></p><p>7. look up spec's on system. then meter exact charge in oz in a Yellow Jacket Dial-a-charge. older vehicle using R-12 will be changed over to Hotshot. unless you've got a stash of R-12. </p><p></p><p>8. load exact charge into system. then start up vehicle to test compressor for proper cycling. check inside duct temps to verify. do a quick sniffer test after removing gauges. just in case</p><p></p><p>above is how I would do fix a leak and get a proper charge installed ... others will do it differently. </p><p></p><p>if a compressor is needed, procedure is slightly different. same if a hose is leaking and needs replaced... etc. etc. many possible problems like clogged fixed orifice tubes.</p></blockquote><p></p>
[QUOTE="_CY_, post: 1587572, member: 7629"] lots of advice ... there's been bad and good advice already given. someone not experienced in HVAC would have a hard time telling which one is correct. 4play is right on the money. it's worth reading twice. HVAC work is very equipment intensive, combined with knowing specific model quirks. definitely one of those times, taking it to a pro is best. not necessarily to dealership. where you get nailed big time is cost of new OEM parts. A job that cost say $275 at a reputable mechanic, becomes $1,000+ at the dealership. right now the best information is a referral to an honest mechanic in your area. ----------------------- below is how I would fix it 1. since I'm not familiar with that model. I'd find a forum that specifically deals in Tahoe repairs. all the common issues related to AC will be probably sticky. chase down all common issues first before doing below. Some Pro's will pay for an AllData subscription. 2. start by doing a basic check to see when/if compressor is coming on. 3. finding the leak... pump down system with a recovery unit. 4. pump it full of nitrogen, test with soapy water. any leaks will show bubbles. slow leaks gets a shot of refrigerant followed by a sniffer with heated LED tip. 5. fix leaks if any 6. attach a micron gauge with a vacuum pump. if system holds at least 450 microns after it stabilizes, then your system is fairly tight. 7. look up spec's on system. then meter exact charge in oz in a Yellow Jacket Dial-a-charge. older vehicle using R-12 will be changed over to Hotshot. unless you've got a stash of R-12. 8. load exact charge into system. then start up vehicle to test compressor for proper cycling. check inside duct temps to verify. do a quick sniffer test after removing gauges. just in case above is how I would do fix a leak and get a proper charge installed ... others will do it differently. if a compressor is needed, procedure is slightly different. same if a hose is leaking and needs replaced... etc. etc. many possible problems like clogged fixed orifice tubes. [/QUOTE]
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