I have a 2009 Tahoe. The snowflake blinks 3 times and does not come on. I changed the ambient air sensor. That didn't work. Now my ignorance is just sticking out so everyone can see. Any ideas?

 

This happened to me a while back in my 2011 Suburban. I had a "rupture" in the coolant lines going from front to back.
It ended up being pretty frustrating because the lines came in 2 parts and only the dealership near me had the crimping tool required to perform the service. But I did it, because I knew the wife & kids would not be willing to drive all summer without AC.

 

Wouldn't the freon level be low? I checked several times and is on the high end.

 

There may be options. The garages near me weren't able to do the patch job someone on my original thread suggested:

https://chevroletforum.com/forum/tah...up-loss-90411/

 

Yes. You must have something different than I had.

 

It wont even turn on. So, I'm not sure how to even check for a leak.

 

Just went through pretty much the exact same thing with my 2001 Yukon XL. I believe you are low on freon. You need to go to a reputable AC shop. Have them check freon level and leaks. The system needs to be checked with gauges, not with those AC Pro recharge kits. This is from experience.

Tom