Climate Control on Seat Leon TDi

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Wed 6 Aug 2003 09:59
Climate Control on Seat Leon TDi - one_eyed_king
Hi,
The climate control on my Seat Leon (03) TDi packed up last night (on the hottest day of the year!), it no longer blows any cold air.
I will do the obvious and check for a blown fuse, broken compressor belt or any sign of leakage.
The reason for this post is that I seem to remember that there is a way to access a "secret" menu on the climate control panel on VW group cars. Does anyone know how to do this? Will it tell me anything useful (a fault code for example).
Thanks in advance.
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Wed 6 Aug 2003 11:01
Climate Control on Seat Leon TDi - daveyjp
Thanks to the Audi A2 owners club site for this:

- Accessing On-Board Diagnostic codes:
Press and hold the recirculation button. Then press the manual flow control up arrow. You should see a 1c. Press the temperature up ("+") or down ("-") buttons to select a code number. Then press the recirculation button again. The value should display. Press the temperature up or down button again to display another code.
NOTE: Air Flow Motor (V 71) and Potentiometer (G 113) are not installed in USA/Canada vehicles. Disregard values displayed for these components.

- Code Displayed Value:
1 System malfunction - displayed as a Diagnostic Trouble Code (DTC), see chart below
2 Digital value of Interior Temperature Sensor, in Headliner (G 86)
3 Digital value of Interior Temperature Sensor, in Instrument Panel (G 56)
4 Digital value of Fresh Air Intake Duct Temperature Sensor (G 89)
5 Digital value of Outside Air (Ambient) Temperature Sensor (G 17), front
6 Digital value of Outside Air (Ambient) Temperature Sensor
7 Digital value of Ambient Temperature Sensor At Fresh Air Blower (G 109)
8 Digital value of Temperature Regulator Flap Motor Potentiometer (G 92)
9 Delta value of Temperature Regulator Flap
10 Non-corrected specified value of Temperature Regulator Flap
11 Digital value of Central Flap Motor Potentiometer (G 112)
12 Specified value of Central Flap
13 Digital value of Footwell/Defroster Flap Motor Potentiometer (G 114)
14 Specified value of Footwell/Defroster Flap
15 Digital value of Air Flow Flap Motor Potentiometer (G 113)
16 Specified value of Air Flow Flap
17 Vehicle Speed (km/h)
18 Actual Air Blower voltage (Volts)
19 Specified Fresh Air Blower voltage (Volts)
20 A/C Compressor (A/C Clutch) voltage (Volts)
21 Number of low voltage occurrences, non-transient
22 Cycle condition of A/C Refrigerant High Pressure Switch (F 118)
23 Cyclings of the A/C Refrigerant High Pressure Switch (F 118)
24 Cyclings of the switches, absolute non-fluctuating
25 Analog/Digital value, Kick-Down Switch
26 Analog/Digital value, Engine Coolant Temperature (ECT) Warning Light
27 Coding value
28 Engine Speed (RPM)
29 A/C Compressor speed in rpm (Equals Engine Speed x 1.28)
30 Software version
31 Display check (all segments of A/C Control Head display light up)
32 Potentiometer malfunction counter, Temperature Regulator Flap
33 Potentiometer malfunction counter, Central Flap
34 Potentiometer malfunction counter, Footwell/Defroster Flap
35 Potentiometer malfunction counter, Air Flow Map
36 Feedback value, cold end-stop, Temperature Regulator Flap Motor Potentiometer (G 92)
37 Feedback value, hot end-stop, Temperature Regulator Flap Motor Potentiometer (G 92), max. stop
38 Feedback value, cold end-stop, Central Flap Motor Potentiometer (G 112)
39 Feedback value, hot end-stop, Central Flap Motor Potentiometer (G 112)
40 Feedback value, cold end-stop, Footwell/Defroster Flap Motor Potentiometer (G114)
41 Feedback value, hot end-stop, Footwell/Defroster Flap Motor Potentiometer (G114)
42 Feedback value, cold end-stop, Air Flow Map Motor Potentiometer (G 113)
43 Feedback value, hot end-stop, Air Flow Map Motor Potentiometer (G 113)
44 Vehicle operation cycle counter
45 Calculated interior temperature (internal software, in digits)
46 Outside (ambient) temperature, filtered, for regulation (internal software)
47 Outside (ambient) temperature, unfiltered, (internal software, in deg C)
48 Outside (ambient) temperature, unfiltered, (in digits)
49 Malfunction counter for speedometer (vehicle speed) signal
50 Standing time (in minutes)
51 Engine Coolant Temperature (ECT) in deg C
52 Graphics channel 1 - A/C compressor switch-off conditions are identified by illuminated segments of the ?88.8? display. See chart below.
53 Graphics channel 2 - Climate system electrical outputs are identified by illuminated segments of the ?88.8? display. See chart below.
54 Control characteristics
55 Outside (ambient) temperature, in deg C or deg F depending on setting on A/C control head
56 Temperature in deg C, from Interior Temperature Sensor, in Headliner (G 86)
57 Temperature in deg C, from Interior Temperature Sensor, in Instrument Panel (G 56)
58 Temperature in deg C, from Fresh Air Intake Duct Temperature Sensor (G 89)
59 Temperature in deg C, from Outside Air (Ambient) Temperature Sensor (G 17), front
60 Temperature in deg C, from Ambient Temperature Sensor At Fresh Air Blower (G 109)
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Wed 6 Aug 2003 11:59
Climate Control on Seat Leon TDi - one_eyed_king
daveyjp, thanks a lot for your help. I'll give this a try today and see what comes up.
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Wed 6 Aug 2003 12:39
Climate Control on Seat Leon TDi - Tim
The codes might not be the same for the SEAT....the ones on my VW Passat that I remember vary slightly from those listed above. e.g 16 is real time speed etc etc
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Wed 6 Aug 2003 13:13
Climate Control on Seat Leon TDi - one_eyed_king
Just tried it in the car park and it reports a fault code of
"22.1" - A/C Refrigerant High Pressure Switch, static open.
(The compressor will remain off until the switch closes).
This should be a warranty job anyway, but I hate going to main
dealers blind.
Does anyone know what a A/C High Pressure Switch is by any chance?
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Wed 6 Aug 2003 18:32
Climate Control on Seat Leon TDi - Dave N
The a/c high pressure switch protects the system from high presssures by opening at 35bar, but should then close again when it drops to around 28bar. What\'s interesting is did it just open, or did it see high pressures, open, then fail to close again? If the later, then obviously the cause needs to be determined rather than just putting a new switch on and hoping for the best. Usual cause of HP is fan failure.
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Wed 6 Aug 2003 21:07
Climate Control on Seat Leon TDi - one_eyed_king
Thanks for that, Dave N. The reason I asked was because I was wondering if the recent very hot weather had overstressed the system in some way.
When you say fan I assume you don't mean the engine cooling fan?
Forgive my ignorance.

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Thu 7 Aug 2003 19:30
Climate Control on Seat Leon TDi - Dave N
I do mean the engine cooling fan. There are 2 of them, and they run at half speed all the time the a/c is on. The more load on the system, the higher the high side pressure goes. If it reaches 17.5 bar, then both fans go to full speed. If the pressure carries on going up (which is very unlikely), then the HP switch cuts the whole lot. When this happens, the pressures subside, and the whole lot turns itself back on when it drops to 28 bar. If there's something wrong with the system, then the pressures shoot up to 35, it cuts off, and so on. You will normally notice this happening as it will cycle every 3 or 4 seconds, jolting you about as it bangs on and off, loading then unloading the engine.

As I said before, pressures will only normally get up this high if the fans fail, though it can be caused by too much refrigerant in the system, and only show itself when it gets really hot. It may be the switch has just plain broken, in which case none of the above applies, but as the switch is actually a 3 position switch, that opens at low pressure, closes at normal pressure, then opens again at high, it seems a bit odd that it has failed on the HP part, whereas one would expect it to fail to the low pressure setting. That's why you just need for the dealer to check that it's a straight switch failure, and not one preceded by a high pressure situation, otherwise you'll be back there again with poor a/c.
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Mon 11 Aug 2003 11:10
Climate Control on Seat Leon TDi - one_eyed_king
Thanks for that DaveN. Car is booked to go to the dealers on Monday. I'll report back their findings.
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Tue 16 Sep 2003 15:21
Climate Control on Seat Leon TDi - mare
i was hoping that this would help me solve my Octavia problem, but realised that the system is probably different.

I have Climatronic in my Octavia TDi SLX, the display unit of which i have seen in VW Passats and Ford Galaxies. I can get no cold air over than fresh air. I have checked the relay, and that is ok. I haven't got a clue where the compressor is to check the belt.

Does anyone know how to access the diagnostics for this system? Like one-eyed-king, i'd like to be a bit clued up before i visit a specialist.

Thanks
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