S-Class (W220) 1999-2006: S 320 CDI, S 320, S430, S 500, S 600

S430 A/c Help..please

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Old 08-29-2013, 04:06 PM
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2001 S430
S430 A/c Help..please

Can someone make sense of these readings...
01 In-car temperature sensor............................................ .... 25,5
02 Outside temperature sensor............................................ ..30
03 Heater core temp, left. .................................................. . .16
04 Heater core temp, right............................................. .......16
05 Evaporator temperature sensor. ........................................15
06 Engine coolant temperature. .............................................84
07 Regrigerant pressure in bar (e.g. '4' is 4 bar). .....................11
08 Refrigerant temperature. ................................................ .44,4
09 Not used.
10 Heater blower control voltage (normal 08-6.0, meaning .8 to 6 volts). 3.9
11 Emissions sensor voltage........................................... ...... 28%
12 Sun sensor voltage (to shift airflow in car)..............jumps between 50-70
20 Control current for auxilliary fan (electric fan on radiator, given in milliamps or mA). .................................................. ...................40%
21 Engine speed (x100). .................................................. ......540 min
22 Road speed (km/h or mph depending on installation). ..............0
23 Battery voltage at terminal 58d (as a percentage of total voltage, e.g. 99.0 = 99%). .................................................. ......................0%
24 Battery voltage (e.g. 12.8 = 12.8V). ....................................14
40 Climate control software version. ..........................................ZU
41 Climate control hardware version.......................................... ZU


The system is not running good. if the sun is out or I stop for a light it turns worm to unbearable inside.
rechargerd the system and replaced the sun sensor...no difference....
Please help...thanks
Old 08-31-2013, 09:36 PM
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2001 S430
my low pressure is 45 and my high is 125. at 80 deg the high should be about 200. can anybody tell where to look for the problem?

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