Toque

Guys:

I know this has been written up before. I just did not have it on MY site yet with my pics from actually doing it.

My web page...
www.ToqueZ06.com

Scroll down to :
C5 Corvette HVAC Dim Display Fix:


Here is how to remove the HVAC control unit from the C5 Corvette.













Remove the 4x screws in the HVAC cover (Circled in red).



Remove the 4x screws in the circuit card (Circled in red).



The surface mount resistors in the below picture (circled in red) need to have the solder re-flowed..
Be sure to solder on a flat surface as the surface mount resistors will move around if your circuit card is on an angle.

**NOTE** There is another HVAC board design out there.
The same 241 surface mount resistors need to be re-flowed.
They are on the same board, just not in the same position as my board below.





This is after I did the soldering work.
The HVAC display is back to standard brightness now.




Re-install the circuit card in the HVAC unit.
Test the HVAC in the car to make sure it works fine before final install.
Re-install the HVAC unit into the car.


Hope this helps someone out !
Toque

lucky131969

You should note in your write up, that there are two different PCBs, so the one in your write up may not look like the readers.

Toque

Good point.... I added a Note...
Thank you !

Thanks

Toque

Jeff in Den

Thanks Toque! Just did this today as I couldn't stand it any more. Took about an hour (with breaks), and as a side note, you may not have to disconnect the fuel door connector. Once I removed the nuts on the back of the aft console I was just able to move it back enough to remove the fwd piece out. Thin gauge solder, flux, and a medium temp iron made it a quick job. I had two 'floaters' that must have been the problem.

I've never seen the display this bright...ever!

Thanks again.

Toque

Congrats ! I'm glad it worked for you !

A guy locally just started to hang out at our weekly GTG and mentioned that he payed $400 for a new HVAC unit because of the Dim Display issue. He was not happy when I told him that I could fix it easily...

You saved yourself $400 !

Toque

SteveDoten

great write-up!!!

I fix quite a few of these hear in CT and on my Orlando FL trips each year

It's nice to know what your AC is doing

Toque, where did your sc come from?

Thanks, Steve

Toque

Steve:

Thank you ! What do you mean SC ?

Toque

PUMP03

Between this writeup and the sticky http://forums.corvetteforum.com/c5-t...splay-fix.html
I had all the directions and tips to make this an easy project. Thanks to all the pathfinders. This forum removes most of the stress from owning a C5 (Imo, one of the top 10 best looking production cars ever made)
P.S. Any C5 owner in the North Dallas area that needs help on this, I would be glad to help out. Just shoot a PM my way to get the hook up started.

jrose7004

Great write up!

Toque

I have already done 5 or so in our local area.

Your in our local area... why have I not seen you at our GTG on Sundays in Plano ?

http://forums.corvetteforum.com/sout...reas-viii.html

Hope to see you one evening you have free !
Toque

PUMP03

First I've heard about Collin County Group. I'll try to make it out to one.

Toque

Were meeting tonight !

7 PM at Twin Peaks.
15th street and 75 HW
Come on out !

Toque

Chicago1

Well I bored and had most of everything out for awhile and figured what the hell not. Man took me about 10 mins if that and my display works again. Thanks so much

Toque

Glad it worked for you ! Its easier than folks think !

Toque

golfbum1932

Just finished replacing the shifter bulb, 5 minutes, emergency flasher, 30 minutes, and resoldering the HVAC resisters. What a great forum this is. Really appreciate the information that is provided for the do-it-your-selfer. I have had way too many bogus ideas as to what fixes would be needed to rectify issues on my 00' C5. My total parts cost was under $50 and a couple hours of my time.

Z06TWT

Just started having this problem and saw this great post. I have not soldered since shop class in HS, so what does it mean to " re-flow " the solder and what type/ gauge solder did you use. Thanks

Toque

Im told its best to use a solder with a little more silver content in it.
I just used the regular stuff from Radio Shack though.
Its been good for years on my car so far.

Just add a little solder to the connections on both sides of each resistor.
Just be VERY careful to have the board on a flat surface. Those little suckers like to move around on you.

Toque

Cmartin214

If the resistors don't seem loose at all is there something else causing the display screen not to come on? Does anyone know if there's someone in the frisco area that could fix it and maybe do the blue led bulbs?

Toque

Its not that the resistors are "loose".
Its that the solder connection between the board and the resistor goes bad over time.
Thats why the display "fades" over time.

You just need to add new solder to the resistor points as in my procedure.

Toque

aManDla

Looking for help fixing my Hvac display in my C5. I'm all thumbs. Updated my radio to hands free model it may have caused an issue with Hvac display. Any vett techs in washington dc area. Bill