C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

AC not working

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Old 08-30-2014, 03:15 PM
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RioB
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Default AC not working

I am having trouble with no AC, Can anyone tell me how to run a test on the control head
Old 08-31-2014, 01:56 AM
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Cliff Harris
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The HVAC system changed completely in 1990. We need a year.

You can put the HVAC system into diagnostic mode by pressing a magic combination of buttons which changed from year to year. I press REAR DEFROST and WARM to get into diagnostic mode. Convertibles don't have a REAR DEFROST button, so they use a different combination of buttons:

https://www.corvetteforum.com/forums...stic-mode.html
Old 08-31-2014, 11:46 AM
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pcolt94
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It would be also helpful to state exactly what the symptoms are. What is not working like the compressor or blower fans. I assume you have a automatic C68 system. What is working like vents and blower etc.

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