ZR-1 Net Registry Forums - View Single Post - C68 HVAC Programmer Compatibility for 1990

Axial · 08-22-2021

Greetings, all!

My car has been exhibiting the symptoms of a failed C68 module:

100% Unresponsive head unit
Triple dashes in the temperature display
Blower on full blast, hot, through the defogger vent

I have just removed the module from the car. While doing so, I noticed the somebody had been in here previously because the vacuum lines had been taped together and the washer+unidirectional keeper that holds the vacuum line block into the unit were missing.

Hmm, ok.

After removing the module, I was surprised to see the following part number on its sticker:

16145131 LT5

I thought this part number was for 1994-1995 ZR-1s and that the 1990-1991 cars required Part No. 16160831 LT5 and that the two were not interchangeable. Am I mistaken? The HVAC had been working fine for three years before suddenly failing one day.

I have the Batee rebuild kit and will be rebuilding the unit, but now I'm wondering if it didn't fail because it's the wrong part.

Thoughts?

08-22-2021	#1
Axial Join Date: Aug 2021 Location: Manassas, VA Posts: 15	C68 HVAC Programmer Compatibility for 1990 Greetings, all! My car has been exhibiting the symptoms of a failed C68 module: 100% Unresponsive head unit Triple dashes in the temperature display Blower on full blast, hot, through the defogger vent I have just removed the module from the car. While doing so, I noticed the somebody had been in here previously because the vacuum lines had been taped together and the washer+unidirectional keeper that holds the vacuum line block into the unit were missing. Hmm, ok. After removing the module, I was surprised to see the following part number on its sticker: 16145131 LT5 I thought this part number was for 1994-1995 ZR-1s and that the 1990-1991 cars required Part No. 16160831 LT5 and that the two were not interchangeable. Am I mistaken? The HVAC had been working fine for three years before suddenly failing one day. I have the Batee rebuild kit and will be rebuilding the unit, but now I'm wondering if it didn't fail because it's the wrong part. Thoughts?