I have a 2007 Tahoe and when I push the snowflake button to turn the air on it blinks three times then stays off and it blows worm air. When I push the recirculate button it also blinks three times and goes off.
I have read online when I was searching for answers that it can be…
ambient air temperature sensor, low pressure, high pressure in the cooling system and I also tried to reset by holding the buttons in but nothing!! Any info would be awsome!!

 

I don't know about all the stuff that you mention, but I will tell you what it was in my 2001 Yukon XL with manual AC / Heater controls. I had the same issue when I first got mine, about 5 years ago. I would get the 3 flashes on the AC button. By memory, as the Yukon is not where I am: 1. Make sure the fan is on at some speed, cannot be off and 2. Make sure the selector switch is on bi-level (I believe). That should eliminate the 3 flashes.

Tom

 

most likely low refrigerant charge.
-is the ac compressor clutch engaging...no = low pressure is one possibility
-compressor engaging but suction line is not cold= possible low pressure.
have the system recovered to determine if the charge is low. If low, have it charged and checked for leaks; with either uv dye or electronic leak detector.