97 LSS
#1
97 LSS
97 LSS, 40,000 original miles
Have had issues with the HVAC defaulting to the defrost and floor for quite a while. Bought a rebuilt controller and vacuum harness. Now, mostly works most of the time. will switch modes, bi level, upper etc. But sometimes stuck on defrost and most of the time still allows portion of the air to the defrost. And the temp flashes, like is common when the system is messed with.
Thoughts??
Have had issues with the HVAC defaulting to the defrost and floor for quite a while. Bought a rebuilt controller and vacuum harness. Now, mostly works most of the time. will switch modes, bi level, upper etc. But sometimes stuck on defrost and most of the time still allows portion of the air to the defrost. And the temp flashes, like is common when the system is messed with.
Thoughts??
#2
Senior Member
Usually when the temp symbol flashes a code is set in the HVAC control head......this can inhibit the functions of the controller....
On some units, you can access the codes by pressing combinations of buttons on the control head......i.e., I think pressing the OFF and temp UP buttons at the same time, puts it in diagnostic mode.....can't remember what button you press next to get the 2 digit codes....
If you manually can't get to the codes, then you need a high end scan tool, to read the codes....
On some units, you can access the codes by pressing combinations of buttons on the control head......i.e., I think pressing the OFF and temp UP buttons at the same time, puts it in diagnostic mode.....can't remember what button you press next to get the 2 digit codes....
If you manually can't get to the codes, then you need a high end scan tool, to read the codes....
#3
Senior Member
Posts like a Turbo
97 LSS, 40,000 original miles
Have had issues with the HVAC defaulting to the defrost and floor for quite a while. Bought a rebuilt controller and vacuum harness. Now, mostly works most of the time. will switch modes, bi level, upper etc. But sometimes stuck on defrost and most of the time still allows portion of the air to the defrost. And the temp flashes, like is common when the system is messed with.
Thoughts??
Have had issues with the HVAC defaulting to the defrost and floor for quite a while. Bought a rebuilt controller and vacuum harness. Now, mostly works most of the time. will switch modes, bi level, upper etc. But sometimes stuck on defrost and most of the time still allows portion of the air to the defrost. And the temp flashes, like is common when the system is messed with.
Thoughts??
#4
Senior Member
Posts like a Supercharger
I had this problem on a '97 LSS a few years ago and it turned out the vacuum line manifold had deteriorated and some of the nipples had collapsed, which is very common on H-bodies of that era, especially the ones with electronic thermostats. The solution was to eliminate the manifold by getting a couple feet of silicone vacuum line, slightly larger than the car'* climate control vacuum lines, and cut it into two-inch sections. The car'* vacuum lines are stiff enough to push into the larger line, so just push like colors into each end of a piece of the larger line as far as you can get it to go. You'll need to remove the glove box to get to the manifold. Once I made this fix, I never had another problem with it.
The following users liked this post:
CathedralCub (07-16-2018)
#5
Junior Member
Posts like a Ricer Type-R
Thread
Thread Starter
Forum
Replies
Last Post
blawton_25
1992-1999
8
06-27-2007 06:14 PM
DJ SHO
Everything Electrical & Electronic
3
07-09-2004 08:20 AM