I think the ACC in my 1997 E300D functions fine, but is just low on refrigerant. So to analyze things a bit I thought I would check error codes and real-time values. I know there's a ACC button sequence to perform a flap control test, I'll do that soon.

I got in my car after work a few days ago and before starting the car, used the procedure to find the error codes.

Eb1231 - ETC sensor (B11/4)
Eb1235 - Emissions sensor (B31)
Eb1422 - Series interface (K1) connection to instrument cluster (A1)
Eb1459 - Series interface (K2) connection to instrument cluster (A1)

I cleared the codes and now several days later they have not returned.

Then I looked at my actual values, 4 times.
- Before I started the car.
- After I drove home and tuned the car off.
- (so two non-running measurements)
- A couple days later I took measurements driving to work.
- I then took measurements driving home that same day.
- (so two running measurements)

These are the measurements over those 4 samples. Do you see anything unusual? Might I just need my refrigerant refilled to get better cooling in the cabin? Setting it to 68/68 on auto just doesn't seem very cool on days in the 80F range.

1.In-car air temperature sensor: 37, 25, 22, 17
2.Outside air temperature: 28, 29, 25, 26
3.Left heater core temperature: 32, 61, 08, 07
4.Right heater core temperature: 32, 37, 07, 05
5.Evaporator temperature sensor: 55, 51, 48, 47
6.ECT sensor (DFI, IFI): 39, 92, 78, 83
7.Refrigerant Pressure in bar: 06, 12, 08, 09
8.Refrigerant Temp Sensor (F): 29, 46, 26, 29
9.Not Used (but has numbers?): 05, 05, 15, 16
10.Blower control voltage: 4.5, 2.1, 1.8, 4.5
11.Emissions Sensor (voltage): 4.3, 3.9, 4.0, 3.7
12.Sun sensor (voltage): 3.6, 4.0, 2.9, 3.8
20.Aux. fan control current (amps): 0.0, 0.0, 0.0, 0.0
21.Engine speed (x100=rpm): 00, 00, 16, 18
22.Vehicle speed (km/h): 00, 00, 35, 73
23.Terminal 58d (%Battery Volts): 00, 100, 00, 00
24.Battery Voltage: 11.5, 11.5, 12.7, 12.7
40.Software Status: 71, 71, 71, 71
41.Hardware Status: 36, 36, 36, 36
42.Unlisted/Unknown: 72, 72, 72, 72
43.Unlisted/Unknown: 136, 136, 136, 136

Thanks everyone!

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