I have a 2010 Silverado 1500 WT regular cab with the 4.8. I bought the truck late last summer and the AC has always made this whistling sound (sounds like it's coming from under the hood) when I am on the gas. The sounds stops when I let off the gas. The AC has blown cold until last week. One day I started it after work and it blew barely cold air for about 10 miles then started blowing cold like normal.
The next day it blew cold right from the start but was also blowing fog from the vents. It kept blowing fog intermittently for maybe 50 miles. When I stopped I looked underneath and it seems like it was draining ok.
Then all worked normal until today. After work the same thing....it blew barely cold air for about 15 miles then blew normal cold the rest of the way home (my commute is just over 30 miles each way).
Any thoughts?
The next day it blew cold right from the start but was also blowing fog from the vents. It kept blowing fog intermittently for maybe 50 miles. When I stopped I looked underneath and it seems like it was draining ok.
Then all worked normal until today. After work the same thing....it blew barely cold air for about 15 miles then blew normal cold the rest of the way home (my commute is just over 30 miles each way).
Any thoughts?
