C4 Corvette Climate Control Codes

C4 Corvette check engine light, or in this case check air conditioning system light can be used to diagnose what is wrong with your climate control system. The light above the climate control buttons will flash indicating a problem and you can check the codes by holding the up and down fan buttons for 5sec. You will see -00 and then hit the auto fan button to get the code.

The codes are:
Temperature door motor circuit fault...01
Temperature door motor circuit fault...02
Outside air temp sensor open...........03
Outside air temp sensor short...........04
Inside air temp sensor open..............05
Inside air temp sensor short..............06
Sun load sensor open.......................07
Low refrigerant detected....................09
Serial data failure.............................10

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Disclaimer:
Due to factors beyond the control of ChrisFix, I cannot guarantee against improper use or unauthorized modifications of this information. ChrisFix assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk. ChrisFix recommends safe practices when working on vehicles and or with tools seen or implied in this video. Due to factors beyond the control of ChrisFix, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not ChrisFix.

[OrpheussZ]

Dude, I was 17 (I’m 25 now) when I was watching these videos on how to work on my first car which was a 92 M6 C4 Targa top and I remember watching all your videos for any tips or tricks. Can’t believe how your channel has blown up completely!! Congrats again man! Well done.

[richdeanwestcoastcollectorcars]

I'm working on a 1992 ZR1 Corvette with the same problem, I ran the diagnostics
as shown in your video, it came up with an 03 code (same as you show) Sure enough, the connector came loose. Plugged it back in and back in business! Thank you for your excellent video and explanation Chris! Rich

[lylelarson]

This guy is for real, thanks Chris, you are very helpful.

[michaelpagliuco]

How are u chris this is ultimatley amazing wat u have here goin. On with this you tube page alot of fantastic info just want to say thank u so much from the bottom of my heart michael pagliuco here in denver co yes u helped me out so great thanku so so much i am blessed to see this on youtube im very grateful to you ...i got this 84 c4 corvette yrs ago as a gift from my buddy eddie its a amazing car i love it and cherish it so so much money in this car im 57 yrs of age and i wont stop wana make it show room new but as i say my dear friend i. Cannnnot thanku so muc. Very great info u are the best thanku sir very respectfully michael pagliuco in denver

[driving_in_YYC]

I knew the engine fault code check with the bridged OBD-like connector and dash display. I knew the engine RPM through HVAC. But I did not know HVAC showed all these other functions. Thanks!!

[MyCatInABox]

Ha!
GTFO! That A/C display showing different "parameters" is a trip, man!
I had NO idea it even did that.
Crazy....

BTW: That's a really clean Corvette.

[danskipper]

Did you clean the front of radiator ? Mine was running hot also, they say a c4 is like a giant vacuum cleaner rolling down the road

[POWERBRAKEBOB]

I have not driven my ZR-1 yet,
but i had the same code 3 and the temp sensor was unplugged, maybe for decades. It will be a dream come true if the a/c works. i also have a blend door issue aiming hot air right up my middle while I drive. If I can disconnect it and shut the door, I will.

[felixmaguilu]

Hi Chris, thanks for your help. The problem was a short on the ac compressor power line. Thanks again.

[fumigacionespestmex]

thanks Chris
tengo poco que compre mi Corvette 91 y pensaba que no servía el a/a y seguí tu guía y listos
gracias desde México

[richcory]

Where did you get that chart? Thanks for the video

[charlesturnage]

Good Stuff. Wow. Mines been sitting in garage for over 4 years because I'm CS to work on it. This helps

[keltechindustries]

Hey, what’s up, Chris? I was wondering if you could help me out with this one, I also have a C4 Corvette. I have a 92 and I have no power going to the fuse and no power going to the compressor. I checked the fuse panel on the passenger side door and it has no power. Is there another source of power where I could look at?

[mrdubois]

wow this is great help because i have a 1990 model and i believe the digital coolant temp was not available yet so this way would be working because everybody tells me the analog is not so precise and i have hi coolant temp issue.

[ozzstars_cars]

I changed the thumbnail pic from google images on the corvette climate control repair video I made.  Thanks for letting me know Chris. 

[xargon]

Is there any chance you can post a pic or where to find the list of engine parameters that can be seen on the climate controls?

[JoeGiz]

Hi Chris, I have 92 Vette 23k original miles 1 owner garage kept. and just changed the battery. The On light was flashing then stopped. I checked the codes which read 00 -00 Connector is connected for the outside air sensor however no cold air seems to be blowing. The compressor clicks on and off every 5 seconds or so. Any ideas? Thanks.

[RALTBOB]

What GM book did you get the codes from?

[joedestito]

hi Chris, i have a 1989 C4 with the electronic climate control and this doesnt seem to work on my vette.The climate control is different than the one in your video and just reads 0 when you hold down both fan controls.It wont go into a diagnostic mode.Does this work on older C4s?Thanks Joe

[bobpelletier]

I know this is a old video. But I have a 92 and getting a “8” code. Your list doesn’t have number 8. Any idea?