dim temp light for a/c display
Race Director
Joined: Apr 2005
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From: Wesley Chapel, FL Las Vegas, NV
Administrator
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From: In a parallel universe. Currently own 2014 Stingray Coupe.
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CI 5, 8 & 11 Veteran
Common problem with the Dual Zone HVAC. I've got some files that talk about the repair - if you'd like a copy, just PM me your e-mail address.
Burning Brakes
Joined: Nov 2001
Posts: 1,162
Likes: 81
From: Bel Air MD
i found a place that rebuilds the unit. I was having problems with adjusting the temperature beyond a 4 degree range and also turning the unit off. i just sent it off this past Saturday. Should get it back this weekend. I'll post results. The cost was only $45. They also rebuikd speedometers an dother types of electronic units for various make af cars.
Burning Brakes
Joined: Aug 2006
Posts: 753
Likes: 2
From: Denville NJ
Right, I think there will be many owners interested in this one, it's such a common problem. It appears that the diy is fairly straight forward, but I note there are warnings that you could damage the circuit board.
From those who have done this, is that true?
From those who have done this, is that true?
Le Mans Master
Joined: May 2006
Posts: 7,847
Likes: 228
From: Hillsboro OR
The fix is re-flowing the solder connections on the (8) current limiting resistors of the LED segment display. The key is don't get the board/components too hot. Ideally, you want a soldering iron at ~600 degrees F. For safety sake, unplug board first.
Apply a small dab of flux to each solder joint.
Apply soldering iron to joint. As soon as the flux vaporizes and the solder melts (approx. 1 - 2 seconds max.), remove the soldering iron. When the solder hardens it should still be relatively shiny.
Clean flux from the solder joints (flux is corrosive) afterwards with alcohol and Q-tip.
Apply a small dab of flux to each solder joint.
Apply soldering iron to joint. As soon as the flux vaporizes and the solder melts (approx. 1 - 2 seconds max.), remove the soldering iron. When the solder hardens it should still be relatively shiny.
Clean flux from the solder joints (flux is corrosive) afterwards with alcohol and Q-tip.
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Race Director
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St. Jude Donor '08-'09-'10
Cruise-In IX Veteran
For everyone wanting the fix for the dim HVAC, its very simple.
Remove the center bezel and HVac system.
Remove the control board in the rear of the HVac system
Re-solder the connections I have highlighted below.
Re-install everything and walla ..all fixed.
PM me with any questions
Remove the HVAC
Re-solder the highlighted connections below
Remove the center bezel and HVac system.
Remove the control board in the rear of the HVac system
Re-solder the connections I have highlighted below.
Re-install everything and walla ..all fixed.
PM me with any questions
Remove the HVAC
Re-solder the highlighted connections below
Le Mans Master
Joined: May 2006
Posts: 7,847
Likes: 228
From: Hillsboro OR
Likely the circuit boards were ran through the wave soldering machine at too low of a temprature. This would form cold solder joints. Vibration over the years causes cracks and eventual failure.
That's my scientific wild azz guess.
That's my scientific wild azz guess.
Pro
Joined: Aug 1999
Posts: 532
Likes: 0
From: Lone Oak Texas
Burning Brakes
Joined: Nov 2001
Posts: 1,162
Likes: 81
From: Bel Air MD
An update to my problem. My unit could not be repaired. i had to buy a remanufactured one from a different vendor. The net cost was $120 My problem was not with the dim display. I could not change the temp settings by more than a few degrees and the unit would not always turn off when you pressed the off button. The remanufactured unit works fine.
Melting Slicks
Joined: Dec 2009
Posts: 2,504
Likes: 66
From: Louisville, KY
dim lights fixed
I did mine today. Took about an hour total or less until it was done and the tools put away. Was not a big deal at all, and I am not good with a soldering iron. Anyone on the fence about taking on this job - go for it
Burning Brakes
Joined: Aug 2010
Posts: 930
Likes: 13
From: Aiken SC
HVAC resolder
One note on the resistors: Even thought the pictures show 8 resistors (4 in each vertical row), that's not the case with all boards.
Some boards will have 5 resistors in one location & 3 resistors to the bottom right. The latter boards came out supposedly in 2000 but mine was a late model '99 & this was the case. Still, there are 8 resistors (#241) regardless of the board. Sometimes the original solder just needs to be reheated to let the solder flow together again. The fix is easy & usually doesn't take more than an hour total frome removing the bezel & re-installing.
Gregg
Some boards will have 5 resistors in one location & 3 resistors to the bottom right. The latter boards came out supposedly in 2000 but mine was a late model '99 & this was the case. Still, there are 8 resistors (#241) regardless of the board. Sometimes the original solder just needs to be reheated to let the solder flow together again. The fix is easy & usually doesn't take more than an hour total frome removing the bezel & re-installing.
Gregg
