DENALIA

Thanks for the info. Is there a tag somewhere in the engine compartment that says how many oz. should be put in?

My 2013 GMC Denali is doing the same thing. At 103* ambient temp my pressures are 40-45 on low side and 140-150 on high side. I just got it back from the shop and they said it did not have any r134 in it. He said the filled it with 2 cans r134 and the idle pressures are normal. While taking off from a stop you can feel the air cut off then once you maintain normal throttle pressure it gets cold again. any help will be appreciated.

I am having the same issue. Someone told me to make sure I have a sending unit for a gauge and not a light. I have not been able to check it yet but when I do I will post here if it made a difference.