Zr1 - different C68 programmer
 

Appreciate the input, gentlemen.
All topics I've found on the subject, end with the programmer being replaced. Except this one, where he replaces the caps. This however, did not solve it in my case.
http://www.corvetteforum.com/forums/...-repaired.html

Wouldn't a faulty sensor give the appropriate fault code?

I'll keep my eyes open for a 90-91 programmer.

Edit,
Rod, did you also have those dashes? I'll have to check the flap as well, just in case.

Re: Zr1 - different C68 programmer
 

The display did read - - - but I don't recall the fan running at full tilt but it could have been. I thought having the FSM would help me solve the problem but I couldn't find this exact problem addressed. I guess Gordon kept a few ideas for himself!


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Re: Zr1 - different C68 programmer
 

Found this statement in the 8A supplement.
"Three dashes will be displayed on the Heater and A/C Control Head if the A/C Programmer fails." Not all to useful, but at least it also points to the programmer.

Edit: additional FSM info,
https://uploads.tapatalk-cdn.com/201...23e717bb40.jpg

Re: Zr1 - different C68 programmer
 

An other old thread with the same issue. I'm just collecting info here in this thread so I can find it when I get back home.

http://www.corvetteforum.com/forums/...cs-inside.html

Re: Zr1 - different C68 programmer
 

I can confirm that my old 95 coupe had a different program as more selections ran with a/c rather than just vent air as my 91 does.

Re: Zr1 - different C68 programmer
 

For parts interchange I can add what has worked for me. A '91 or '92 or '93 ZR-1 Programmer will work if it is used with a '91 or '92 or '93 button panel. If an 08 sun sensor errors occurs, cover the sensor with tape.

Re: Zr1 - different C68 programmer
 

If the 90 and 91s apparently are compatible, would that entail that a programmer from the model years you mention also could work on a '90?

I've gone through the FSM fault finding, and it just ends on "replace programmer". I've resoldered everything, measured all diodes, replaced all capacitors, and checked the board while live (connected/ign. On) with freezing spray to check for hotspots. Nothing. Getting close to giving up on this one.

Re: Zr1 - different C68 programmer
 

Yes, '91 to '93 Programmers should work on a '90. It may be necessary to use the matching model year button panel.

I tried fixing a '94 Programmer with capacitors and freeze spray, just like you. Sometimes it worked when the large IC chip was frozen. But it never worked at room temperature. BTW, the earlier Programmers will not work on a '94. I had to find a '94 Programmer to fix the '94.