HVAC Programmer issue? AC only blows through defrost vents - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat
GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

Go Back   GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat > Pontiac Bonneville > 1992-1999

1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

LinkBack Thread Tools Search this Thread
Old 01-28-2008, 03:55 PM   #11
Junior Member
Posts like a Ricer Type-R
Join Date: Jan 2008
Posts: 23
Thanks: 0
Thanked 0 Times in 0 Posts
6781camaro is on a distinguished road
Default vacuum nipples on the plug of the programmer

Hi.! Thanks so much for that link to the forementioned post and solution. I carefully looked at all of the diagrams and think I have it solved now!

Here are some other KEY things I discovered today while fixing this issue:
1. Replace ALL rubber vacuum hoses under the hood. There are several that directly supply the main vacuum plug on that programmer connection. Start with the ac vauum tank resevior that is located under your battery tray and in front of the inner fender well on the pass side. There is a single vacuum connection there that starts a vacuum line that is run through a black split loom and continues to the Y-conection located under your fuse panel cover. I replaced that ENTIRE LINE. Even the black plastic tubing was fragile and split in several areas. I also had to replace the vacuum hose that connects to that Y-connector under the fuse panel cover since it had a crack in it. NOW, after that, I knew for sure that was getting a full 21- inches of vacuum with my tester gauge, when I placed it into the main vacuum source hose coming through the firewall which supplies the programmer. That was the solution for my car! Now it works like it should.

ANOTHER TIP for making that programmer main vacuum plug slide back onto the programmer easily is to lightly coat the outsides of each nipple with white grease or even vaseline. It works like a charm--as long as you are very careful not to get any into the holes. Not that simple .

Hope this helps other people out as much as it helped me.

Thanks guys!
FLorida is way too hot to go without air conditioning... year round...
6781camaro is offline   Reply With Quote
Old 04-03-2016, 07:19 PM   #12
Junior Member
Join Date: Mar 2016
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Forg0tmypen is on a distinguished road

How do you remove the hvac programmer box?
Forg0tmypen is offline   Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
A/C problems Driver blows hot Passenger Blows cool Bonneville 2000 SLE katanac 2000-2005 3 07-03-2011 08:26 PM
Air only comes out of defrost and foot vents kparrent Pontiac 5 11-08-2010 03:15 PM
Air Conditioning only comes out of the defrost vents Palmettokid 1992-1999 10 08-06-2005 02:22 PM
A/c not blowing thru vents. Need help w/programmer. popatim 1992-1999 19 07-02-2005 08:47 PM
Air only blows out top & bottom ducts only. Not the VENT vols1992 1992-1999 3 11-10-2002 10:45 AM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 12:27 PM.