Mark'sA8L

My 2000 right now at the 0 to 10 degrees we have been having in the midwest, still warms to normal or a mark below it.

If I use the "hidden climate control" option and change the climate control to view the coolant temp I run 90 to 95 degrees celsius right now in the cold, while during the heat of the summer I run 95 to 102 degrees celsius.

roughyear

where is this.. "hidden climate control" option

Mark'sA8L

recirculation button above it at the same time and it changes the climate control into an onboard scan/view tool.

using the drivers side temp buttons change the display to show 102, once there the passenger side display be showing the temp that the computer is reading in celsius.

If you search the forums for (hidden or hidden climate control) you should find some things on it.

I do not know what all the displays show, I have found some to be the engine rpm, current speed, volts etc.....

Mark'sA8L

I do not think the pre-facelift cars had it

CalG

Follow these simple directions.



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 Engine Speed (RPM)
28 N/A
29 A/C Compressor speed in rpm (Equals Engine Speed x 1.28)
30 Software version
31 N/A
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)
61 Software version (latest)
86 Display Check (All Segments of Climate Control display light up

Some displays may differ, (Reality check needed) but my '99 shows most of these listings.

CalG

CalG

Coolers (Radiators) are sized according to heat rejection requirements. If they are correct for the summer desert, they are overly large for icey winters.

When the air is cold, the coolant flow is reduced. More time in the block getting warmed up, but more time in the cooler getting cooled off. Over cooled in fact. The engine wants to be evenly warmed for best life and performance. The T-stat is helpless to remediate the situation. It's good to restrict the capacity of the cooler!

CalG

roughyear

does Vag-Com do this same thing??

CalG

Yes, Vag-Com does do this same thing??

jazbo123

...although I haven't experienced it in ambients down to -15F/-26C in my 98Q.


"The engine block temperature sensor could read "low", while the temperature at the T-stat would be high enough to open the T-stat."


...Or else your stat doesn't seal off completely, or else the response of the stat is too non-linear or has insufficient "opening resolution".