HVAC hacks

[spinner]

Here are a couple items that I saw giantquesadilla report on GreenHybrid...

This is to use your HVAC as sensor scanner
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1. Turn ignition switch to OFF.
2. Press and hold both the AUTO and MODE buttons, then start the engine.
3. After the engine starts, release both buttons. The display panel control unit will flash the sensor number and then the value for that sensor.
4. To advance to the next sensor, press the A/C button

Sensors:
1: mode positioning (BIT)
2: in-car temp (C)
3: outside temp (C)
4: Solar Radation: Dark=00, Flashlight= 04, Cloudy=10, Sunny=65 (10kcal/m^2*H)
5: Evapotator Outlet air temp (C)
6: Humidity sensor value (%)
7: Heater Core Temp (C)
8: Air Mix opening (the lower the cooler) (% of opening)
9: Recirculation Opening (% of opening)
A: Vehicle Speed (km/h)
B: Engine coolant temperature (C)
C: A/C revolution feedback (100 RPM)
D: Vent air Temp out (TAO) (C)
E: Solar Radiation azimuth (navi only) (10 deg)
F: Solar radiation angle of elevation (navi only) (10 deg)

I thought this was kinda a cool thing to play around with.

Source

To revert to the normal display, turn the car off.

The other "hack" is similar in method to the above, except that you hold down the AUTO and Recirculation buttons to put the system into self-test mode. It is a hands-off thing, watching the system to go through its paces. I don't know what the resulting diagnostic number will be on the display, but perhaps Colby can look them up if/when you need to know.

I wonder if the above also works on the Acura CSX.

[volvo9]

Wow, that's a LOT of stuff that the car monitors, and that's just HVAC related stuff, Talk about driving a computer!

[jeffNB]

Originally Posted by spinner

I wonder if the above also works on the Acura CSX.

Yes it does.

I wonder if there is a way to display Fahrenheit instead of Celsuis.