GovtMule66

My Dad ended up having to replace the A/C Compressor along with the A/C Condenser which cracked in the same spot as other GM owners. Since we had the entire A/C unit basically torn apart we went ahead and replaced the expansion valve as well. I'm sorry I don't have a better answer for you.

And if the problem persist then what?

Was you able to reset/relearn the right height sensors on your vehicle using the Autel AP200? I have a 2015 GMC Sierra 1500 Denali which has the Z95 magneride suspension package on it. Unfortunately the front shocks on my truck have become so stiff you can't even press the front end down standing on a ladder. I would like to rule out all possibilities before I sink $1200 in new front shocks/struts. I've called a few dealers in my area but they act like there is no test that can be run to see if any faults exist on a suspension package. Unless I am reading several online sites wrong that is not correct which is aggravating to say the least.

I realize this is a old thread but did you ever get your A/C System to take freon? Thanks

Thank you once again for the help today !!! Hope you enjoy the rest of your weekend.

Would you have any concerns ordering one of two a/c compressors I listed from Rock Auto? Thank you for the help

Can someone please tell me if both these GM A/C Compressors are the same or is there something different about them? My vehicle calls for GM Part # 85656961 but when I enter that particular part number on Rock Auto it brings up 2 separate GM compressors with different part numbers. On another website I found the information in the 2nd photo that shows GM Part # 85656961 superseded #86798574, #84203715, #23478533, #15-22310 & #15-22293 which makes me believe they are both the same. Thanks in advance for the help 2015 GMC Sierra 1500 Denali 5.3 Flex

The bubbles are present if I spray soapy water around the expansion valve then turn on the AC on. The bubbles are also present if I spray soapy water around the expansion valve and just turn the fan on by itself. The minute I turn the AC & Fan both off the bubbles stop. Maybe I'm wrong but I would think there should be bubbles all the time if the expansion valve is actually leaking. Thank you for offering to help us.

I followed your advice which I appreciate but now I have another question. As you can see in the photo below when we sprayed the soapy water on the expansion valve bubbles appear. If I turn off the AC off but leave the fan running bubbles appear. If I turn my fan & AC completely off the bubbles stop which I don't understand. The AC system in our truck is currently charged and working properly. Why would the bubbles stop the minute I cut the fan off if the expansion valve is leaking especially in a pressurized system? Is there any chance the air coming off the evaporator blower is passing by the expansion valve causing these bubbles? I guess if I put UV Dye in it would answer my question but I thought I would throw this out there. With the amount of bubbles I was seeing I wouldn't think a system would hold freon more then a day where this one is lasting about 2 weeks. Once again thanks for the help

My Dad owns a 2015 GMC Sierra 1500 Denali with the 5.3 engine package. A few back he noticed the truck wasn't cooling like it should and after checking the low & high side pressures decided to add a small amount of freon. When I say small I mean small because all it took to get the truck acting right again was about 5-6 oz of freon. Fast forward 2 weeks and now he is back in the same boat again and has began the process of tracking down the leak. The first place I looked was the AC Condenser but luckily his hasn't broke at the top corner like many others have experienced. Today I had my HVAC freon checker/sniffer out going over the truck and every time I passed over the left side of expansion valve it went off. Does anyone know if these Expansion Valves are known to leak here? The freon checker didn't go off when I passed over the o-rings where the cooling lines connect, it would only go off when I passed over the left side. Thanks in advance for any help you can give.

Thank you SwampCatRuss I know this post & topic is several years old but I appreciate you taking the time to try helping others. Today I was trying to help my Dad work on his 2015 GMC Denali when we were shocked by the amount of leaves, pine needles & twigs that had been sucked into the cabin air filter. After reading your post I checked behind the battery and sure enough this rubber plug you described was just laying there. Tomorrow we will take on the challenge of trying to put the plug back where it belongs.