EDS_5_OH
Newbie
I have a couple questions for clarification.
Some background:
I just got my interior all together and my engine started. I have a mix of to different years going on. My cab is a 1990 Z71 which I did not touch the HVAC system at all. I removed all the interior and replaced it with my 1993 interior. I swapped everything, dash board, wire harness, radio, and so on (with the exception of the HVAC system from '93). After hooking up power and starting the truck, I noticed I'm having the same issue as you described. I have the controller from '93 trying to control the '90 HVAC system.
I don't recall what the controller from the '90 looked like, or its functions compared to the 93, but you said in your last post that by installing a '90 controller the problem was salved? Could you help me out and explain what the "RECIRC" button is.
I should also mention I have not finished installing any of the A/C components under the hood. Everything is out and open, not hooked up. Did you check any of that stuff as mentioned in this thread before changing the controller?
Thanks
Nate
The RECIRC or MAX button allows the user to close off outside cab air when running the AC or choose not to. On the older models, it happens automatically since there is no button to choose from.
If there is a problem with the AC, according to my manual and what I've read on-line, the AC display will flash. My understanding is that this only applies to the newer version of the display, not the older series.
In my case, both the temperature scale and the air direction displays flashed after a couple of minutes of running, not the AC. They all still worked and you could adjust temperature and air direction but the display flashed. Installing the old style display (no MAX or RECIRC button) fixed this issue. My AC is not charged and I will need to retrofit to R134 or Freeze 12 to do so.