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Discussion Starter #1
Hi

I have GMC terrain 2011, I just recharged my AC using red tek refrigerant R12a. The car capacity was 654 g and I used 2 bottles 454 g, so basically overcharged for 254 g. Is this can damage my AC compressor or any other parts in the AC system?
 

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You need to use hvac manifold gauges to bleed off some of the charge while monitoring pressure on low and high sides. If you are not experienced with the AC it would be best to take it to a mechanic to do this. Be sure and tell him/her what you added and why.
 

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Discussion Starter #5
I just check out a pressure on-air outside temperature 21 degrees C ( 70 F) the PSI is between 35-40 . Seems that is in the normal range, isn't ??
 

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I just check out a pressure on-air outside temperature 21 degrees C ( 70 F) the PSI is between 35-40 . Seems that is in the normal range, isn't ??
Here are some specs from the 2014 GM Repair Manual.
All are with humidity at 30%-50% and using R134a.

76F - 85F ** Low Side 26 - 37 PSI ** High Side 177 - 224 PSI
86F - 95F ** Low Side 29 - 41 PSI ** High Side 218 - 263 PSI
 
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Hi

I have GMC terrain 2011, I just recharged my AC using red tek refrigerant R12a. The car capacity was 654 g and I used 2 bottles 454 g, so basically overcharged for 254 g. Is this can damage my AC compressor or any other parts in the AC system?
You will damage the compressor if overcharged beyond capacity. An AC shop will evac the system, weigh the Freon, and put the proper amount back in. These newer vehicles are a lot more picky than just pressures at certain temps. Here in Michigan it costs less than $100 for an AC service. $100 now or $1000 when compressor dies. Your choice.
 
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