Np. there should be a ac sticker under the hood somewhere that will tell you the info your looking for. Its usually a silver and blue sticker that tells you how much refrigerant
Unfortunately, the sticker is absent. Either way, you helped me a ton. Great idea! Thanks again. Because of your low pressure comment, I was able to figure the rest out myself, and I got it blowing cold again, in under 30 mins. All I needed was your comment.
Totally appreciated my friend.
Its in the owners manual but I think it is 2.7 lbs for a Tahoe/Yukon.
If you have to add more than a can you have a pretty good leak. Are you adding dye to help diagnose the leak? I know you said it has sealer but does it have dye? Check to make sure the schrader valves aren't leaking when yo are done. They are famous for leaking after being hooked up yo gauges.
2.7 lbs of refrigerant? I may have been (up to) a pound low then. It took less than two 12oz cans. It can't be a very large leak (it holds for too long). I'm assuming it's a seal somewhere near the condenser. I want to say I can hear it, but I don't know? I haven't added dye yet. I want to see if I can solve it w/o dye (I know, I'm stupid. I always make shit harder on myself). I did catch those valves leaking though! Good call. Great advice!
Yea it is triggering the low psi switch. Usually anything below 20 psi with the compressor turning will trigger it. 40 psi is way to low with the engine off. The psi neutralizes between high and low with the engine off (compressor not turning). When the manual says 2.7 pounds it does you no good unless the system is completely empty. Your psi will very depending on the temp outside. You can google generic charts to see what pressure you should need but with the truck running and the compressor on usually 35 to 40 psi on the low side is good. Your high side should be way up there like prob around 200 with the compressor turning (just throwing a rough number out there look at the charts) The Question is where did the it go to began with. If yo want to trouble shoot yourself I would put a can of coolant with leak detect. That way you can get a cheap small black light when it is dark outside to look for a glow on the ac system for a leak. A/c work sucks! It is really not too hard but sometimes leaks can be very very hard to find.
Great advice! You just filled in the rest for me. Seriously, thank you!
You know, you guys are killing me right now! lol. My Dad was an ASE cert. A/C tech before he bled to death in my arms at the age of 49 (I was 20). I feel like such an ******* right now. I still have all of his A/C tools (except for his Glycerine filled gauges - which his old boss stole before I came to pick up his shit, but that's another story
), but for all of the automotive knowledge I learned from him, I never took the time to learn his "specialty". What a ******* shame! My bad Pop! I'm sorry.
Anyway, sitting here witnessing you guys freely help me fill in the gaps......well, I can't explain it, but it's pretty cool. Your simple contributions mean so much to me right now. I'm sure my Ol' man is laughing at me, and winking at you guys right now. lol.
Now get up and go let someone know how much you love and appreciate them.
