96 LT4 Vent problems
Thread Starter
Instructor
Joined: May 2006
Posts: 179
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From: Alton VA
96 LT4 Vent problems
Anyone ever replaced their dash vents programmer for a 96 with manual temperature controller? If so what was the cost? This is the module under the dash that directs the vacuum source to the proper diaphrams for actuating the dampers. When you turn on any HVAC, the air only comes out of the defrost and floor vents. Got a 94 service manual from a friend and did the troubleshooting. I have vacuum from the source into this module, but nothing will change with any button (manual controller) pushed on the dash. The A/C works fine, only the air will not come out of the front vents. Guess I really don't have to fix it, cuz you are suppose to ride around with the windows down and the top off, but it would be nice. The LT4 is awesome. Just got this car back in March, Black on Black and pretty much stock with the exception of SLP headers and a shorty shifter.
Instructor
Joined: Mar 2002
Posts: 247
Likes: 0
From: las vegas nv
mine did the same thing couple years ago. part was 700 and change, dont remember what labor was. i get a good break on parts tho. in the body shop business. dont know what retail is. regards, fng
Melting Slicks
Joined: Jun 2003
Posts: 3,493
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From: The Clem MI
CI 7-8 Veteran
St. Jude Donor '03-'04-'05-'06-'07
I had to replace mine. I believe it was called the HVAC Control Module. It was an expensive part, I did get a deal on mine but it was still over a $700 fix. Seems lately I've been reading a lot about this problems with the 96's. Must be the 10 year itch. 
Originally Posted by ltflt4
Anyone ever replaced their dash vents programmer for a 96 with manual temperature controller? If so what was the cost? This is the module under the dash that directs the vacuum source to the proper diaphrams for actuating the dampers. When you turn on any HVAC, the air only comes out of the defrost and floor vents. Got a 94 service manual from a friend and did the troubleshooting. I have vacuum from the source into this module, but nothing will change with any button (manual controller) pushed on the dash. The A/C works fine, only the air will not come out of the front vents. Guess I really don't have to fix it, cuz you are suppose to ride around with the windows down and the top off, but it would be nice. The LT4 is awesome. Just got this car back in March, Black on Black and pretty much stock with the exception of SLP headers and a shorty shifter.
