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Discussion Starter · #1 ·
can’t find one. scrubbed rbarros’s 08-10 enclave manual. appears to tell techs to charge per shop machine..... googled same for acadia, etc... which searches the sister lambda sites. i’ve not located any specifics.... humidity, temp, pressure curves.... at specified rpm. which i’m use to using

just using generic 134a tables at idle rpms. will recharge when my suction line comes in to 2.3# this next go around

my suspicion is gm evacuates and recharges to specified #’s???
 

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Modern A/C charging machines just need the vehicle and year to charge correctly, its very critical to peak and not over/under charge as cooling will be severely affected. I found than out here in AZ where summer tems get to 114-118F and my 2001-2014 & current 2017 cool quick and will freeze me out quickly. Have your vehicle charged by a specialist with a good charging machine and you will be a happy camper like me.
 

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Discussion Starter · #3 · (Edited)
Good points Redvett. since the service manual mentioned “machine”, i figured they dumbed us down w technology.

i replaced a few more system components, recovered, vacuumed and recharged this afternoon. i charged my 2009 dual evap xv system at the factory 2.3#. gauges looked about right. i revved engine at 2000rpm for a few min to monitor. all looked good.

so the high pressure would dance around. i noticed the condenser/ rad fans would kick on (dual speeds i think) and drop pressure down to 200. the pressure switch must activate the fans to drop temp/pressure this is why it’s squirley to charge. my other vehicles have fans run constant = steady state.

my guess is shop machines evacuate system and perform a recharge by weight?

i’ll double check my readings next time we’re close to 100 in the next few weeks. commonly 60-80% rh. latent load will push the limits of the design

im pretty confident i got it. the stoick charts would be the engineering data tables provided to the machines if they don’t charge by weight.

i’ve not had to mess w my ford or lexi 134a’s yet. i have the 6”’ paper FSM’s for those vehicles, now i’m curious how they charge.....
 

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Discussion Starter · #4 ·
104 heat index. probably hottest it will be rest of the year. checked gauges and appears fine. rad fans have at least two speeds. it greatly fluctuates high pressure readings. this is what makes topping off difficult
 
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