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Old 06-13-2001, 09:20 PM
David C Klasse's Avatar
David C Klasse David C Klasse is offline
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Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
Posts: 2,352
OK, first of all Benzfan, I will list off what the different codes mean. I had to improvise off of 2 different sheets and figure out what was mine since i could only get them for 94 C and some other model, but together, I think I got it pretty accurate. It might even be a LITTLE different than yours, but shouldn't be much different, or too hard to figure out.

1. In-Car Temperature Sensor
2. Outside Temperature Sensor
3. Heater Core Temperature Sensor
5. Evaporator Temperature Sensor
6. ECT Temperature Sensor (Coolant Temp in F)
7. Refrigerant Pressure in Bar (see results below)
8. Blower Control Voltage
9. Software Status of A/C Push Button Module
15. Selected in-car Temperature
20. Version Code
21. Engine Speed (RPM)
22. Terminal 58d, Battery Voltage, % of (ex: 48 = 48 of battery voltage, ie 13.1 volts)
23. Vehicle Speek (Km/H)
51. Current Number of Slip Recognitions of the Poly-V-Belt.
52. Stored Number of Slip Recognitions in the Poly-V-Belt.

Yours might vary a little, but this should be pretty right on.


Ok, now the results of the bar pressure (# 7).

I did a few different readings... wish I could make a graph, but this will have to do for now.
________________

In Car Temperature selected to 72 degrees.
-with engine idling and vehicle stopped, pressure seemed to be in the range of 15.4-14.2. With the car traveling at roughly 20 mph, pressure seemed to go down a little... between 10.1 and 15.

In Car Temperature selected to LO degree.
-with engine idling and vehicle stopped, pressure seemed to be in the range of 15-15.8. With the car traveling at roughly 20 mph, pressure seemed to be between 14 and 17.

In Car Temperature selected to HI degree (full heat).
-with engine idling and vehicle stopped, pressure seemed to be in the range of 12.8 - 17. With the car traveling at roughly 20 mph, pressure seemed to be a lot lower at 10.0 - 8.7.

Now I did some readings with the car in NEUTRAL and revved the engine to 3500 or so, the pressure seemed to slow go down as the revs increased.

Oh, almost forgot! When in EC, Economy Mode, pressure goes down to about 5, between 5.1 and 5.8 were my readings.

There is no consistency with these results, or any pattern that I can see. Maybe the pressure just stays somewhat consistent and varies upon many factors. I'm not sure. But I hope Stevebfl will come along and look at these results!!

BTW, why don't the car rev past 4000 RPMs when in Neutral?






[Edited by David C Klasse on 06-13-2001 at 09:25 PM]
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2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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