Yet another Blinking HVAC- 98 Lesabre
#1
Yet another Blinking HVAC- 98 Lesabre
Hey guys I have an old 98 Lesabre, and it runs and drives great. When I first got it I had to do the Vacuum line mod on the programmer to get the HVAC to blow out the face vents. That was the best $1.60 and 30 min I spent on a car
That mod still works and was done about 1.5 years ago, the ENTIRE time i have owned the car the temp blinks when I start the car, but the HVAC has always worked fine so I paid no attention to it. That is until 3 weeks ago when I had to replace my intake manifold. I disconnected the battery without turning the system to "off". I have been doing a bunch of reading online, and it seems I may have thrown the system'* sync off by doing this.
Right now my problem is this, colder air coming from the pass side then the driver’* side. When I start the car it will seem synched for a few seconds, then it will start blinking and both vents will go FULL COLD, eventually it brings the temp back up the d-side gets hotter than the p-side. I have done the following:
- gone through AT LEAST 50 on/off cycles
- Removed the 9c fuse to try to reset
- Pulled down the glove box door and watched both the upper and lower blend doors go through there whole range of movement (which they do)
- Tried to re-sync by pushing the temp full hot, then full cold a few times in a row.
Besides getting this scanned by a tech 2, which is my last resort, is there anything else I can do?? Did I miss anything??
THANKS
JOSH
That mod still works and was done about 1.5 years ago, the ENTIRE time i have owned the car the temp blinks when I start the car, but the HVAC has always worked fine so I paid no attention to it. That is until 3 weeks ago when I had to replace my intake manifold. I disconnected the battery without turning the system to "off". I have been doing a bunch of reading online, and it seems I may have thrown the system'* sync off by doing this.
Right now my problem is this, colder air coming from the pass side then the driver’* side. When I start the car it will seem synched for a few seconds, then it will start blinking and both vents will go FULL COLD, eventually it brings the temp back up the d-side gets hotter than the p-side. I have done the following:
- gone through AT LEAST 50 on/off cycles
- Removed the 9c fuse to try to reset
- Pulled down the glove box door and watched both the upper and lower blend doors go through there whole range of movement (which they do)
- Tried to re-sync by pushing the temp full hot, then full cold a few times in a row.
Besides getting this scanned by a tech 2, which is my last resort, is there anything else I can do?? Did I miss anything??
THANKS
JOSH
#2
Senior Member
True Car Nut
Turn the HVAC off, disconnect the battery, leave it overnight, then reverse the process. Might not do anything, but worth a shot. Make sure the HVAC is off when you disconnect the battery.
#3
Senior Member
Posts like a Supercharger
Also, the flashing may be from another error found rather than lack of synchronization. I have wondered if mine flashes as a low freon indicator. Since I have a 95 programmer box in my 98, I am not sure it'* totally compatible so I just watch the flashing. But I did do the R/R and glue the gear. So far it'* lasted a year.
Another note is that if I understand the system'* operation, the unit checks to see if it can lower and/or raise the temperature. That may be why yours goes to cold: it may be trying to recalibrate.
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08-06-2010 03:53 PM