A/C cycles through all modes then sticks on defrost.
Thread Starter
CF Beginner
Joined: Aug 2023
Posts: 2
Likes: 0
04 Silverado A/C cycles through all modes then sticks on defrost.
2004 Silverado 1500 2wd.
I just got my transmission rebuilt and replaced the battery but when I start the truck, the AC blows out of the floor vents for about 5 seconds, then the front vents for 5 seconds and then it comes out of the defrost vents but it stays there. I’ve replaced the mode door actuator and even tried the AC control module but it’s still having the same issue. Any ideas what could be causing it?
I just got my transmission rebuilt and replaced the battery but when I start the truck, the AC blows out of the floor vents for about 5 seconds, then the front vents for 5 seconds and then it comes out of the defrost vents but it stays there. I’ve replaced the mode door actuator and even tried the AC control module but it’s still having the same issue. Any ideas what could be causing it?
Last edited by wferd; Aug 26, 2023 at 11:47 PM. Reason: Add vehicle info
Super Moderator
Joined: Feb 2017
Posts: 6,207
Likes: 689
Defrost is the default setting when there's insufficient vacuum.
So you could could have a cracked/leaky hose or vacuum tank, checkvalve that has gone bad, etc.
You should probably post what you're driving.
So you could could have a cracked/leaky hose or vacuum tank, checkvalve that has gone bad, etc.
You should probably post what you're driving.
Last edited by mountainmanjoe; Aug 26, 2023 at 7:21 PM.
Thread Starter
CF Beginner
Joined: Aug 2023
Posts: 2
Likes: 0
Its a 2004 Silverado 1500 . This is the first time I’ve used this so it’s all new to me
Thread
Thread Starter
Forum
Replies
Last Post
Stormyj
2014 - 2018 (GMT-K2)
18
Jun 13, 2024 6:07 PM
garrettathomas7
1988 - 1998 (GMT400)
2
Aug 10, 2021 7:38 AM