Reading codes and sensor outputs from HVAC?

I was reading in a transmission thread a discussion about reading codes and real-time sensor outputs off of the HVAC display. The car was a later LT1 version, but I'm wondering if my 91 OCC has the same feature(?) Need more info!

Here's some videos on how to do this:

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-Mike

The first link is from 95BRMW, Dave, from this forum.

Tom C.

The first one is mine, Lynol made the video when I was at work.

I made this up today from the posts on the ISSF, very handy to keep in your glove box.

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AzDon wrote:

I was reading in a transmission thread a discussion about reading codes and real-time sensor outputs off of the HVAC display. The car was a later LT1 version, but I'm wondering if my 91 OCC has the same feature(?) Need more info!

I think that's just on the LT1 cars?
They do have diagnostic code numbers for the HVAC system that show on the HVAC display when you press a couple of buttons on the panel to go into diagnostics mode if it's like the '92 OCC.
Otherwise if it's the same as '92 it has the deal where if you don't have a scan tool you connect two terminals on the ALDL connector and count the flashes and pauses of the service engine soon light to see what the fault code number is.
Shows it all in the factory service manual.

Here's a 92 RMW's diagnostics. Should be the same between the OCC and RMW

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Great stuff! Thanks for posting all the codes. Been wanting that for a while.