AC: f*ckung freezy or horrible hot?

[Herman]

As you're still not green, here is the ATC check method, no T4 needed

Copied from the index section

How to run the ATC (Climate Control) Diagnostics checks
I have copied this from the The 75 and ZT Owners Club Forums, thanks must go to Mike for the information:

Running this routine performs a full check on the ATC system including the sunlight sensor.

to start the check:

1. Press and hold the AUTO switch and the air distribution switch and then turn the ignition switch from 0 to II.

2. The audible warning and all indicators on the control panel display cycle on and off while the ECU runs the diagnostic check.

3. On completion of the check the display shows FC in the LH temperature window and a two digit fault code in the RH temperature window.

4. If there are no faults, the system will revert to normal operation.

5. If a fault is detected, an audible warning sounds three times and the fault codes cycle on and off in numerical order. The audible warning will sound as each fault code is shown.

6. Cancel the check by pressing the OFF switch or turning the ignition switch to 0.

7. In low light conditions to avoid false sunlight sensor fault indication the sunlight sensor (centre front of dashboard) needs to be illuminated with a strong light source.


Fault code and description

00 - No fault found -

11 - In-car temperature sensor open or short circuit 25 °C (77 °F)

12 - K bus fault with ambient temperature input 10 °C (52 °F)

13 - Evaporator sensor open or short circuit 5 °C (41 °F)

14 - Heater coolant temperature sensor open or short circuit 70 °C (158 °F)

21 - Sunlight sensor, left output open or short circuit no solar heating correction

22 - Sunlight sensor, right output open or short circuit no solar heating correction

31 - LH temperature servo motor open, or short circuit, motor or flap mechanism seized, servo motor locked in position.

32 - RH temperature servo motor open or short circuit, motor or flap mechanism seized, servo motor locked in position.

33 - Distribution servo motor open or short circuit, motor or flap mechanism seized, servo motor locked in position.
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[tomcat22]

thank you all for the information.
can't wait to become green and see the workaround from the club shop

@VMax1000: the heater valve stick is not listed in the fault table, but I already heard that, turning the AC to max heat for cooling down

[black olive]

yes the valve fails but we have a long term fix

[tomcat22]

will now go for the long term fix, as now my mechanic says its horrible hot always