Passat (B5) :: 2003 - Calculated Ambient Air Temperature Too Low?
Jan 25, 2012
I drive a 2003 Passat (B5.5) 1.6 petrol (102HP)
I noticed the problem now, because I wanted to test the electric cooling fan (part 8D0 959 455 R). I want to test it because I have changed the carbon brushes that was worn out in the motor. The fan is now reinstalled in the car and just waiting for some voltage through the standard wire harness. To make this fan spin I figured I could just activate the A/C compressor by setting the Climatronic in "LO" (no ECON). Because it is below freezing outside, I drove my car inside a heated parking garage and let it stay there for an hour or two. For some reason the A/C compressor does not start when I go "LO", even if the car is warm and placed in a warm environment. I noticed that the outside air temperature indicator in the instrument panel and on Climatronic LCD-display showed -3 'Celcius (Just below 32 'F).
After some internet searching I thought that one or both of the air temperature sensors (G17 and G89) were at fault. However, they both seem to be ok. (I even measured the resistance of the ambient temperature sensor, G17, with a DMM and it had the correct value of 1.25 kohm @ 20 'Celcius and 3.8 kohms @ -3.5 'C). In VAG-COM, I read the relevant measuring blocks (08-Auto HVAC, Group 6) for the sensors, and they both show plausible temperatures. See enclosed VAG-COM screenshot. The calculated temperature however (as shown on the cars instrument and Climatronic displays) is way low. A couple of times, calculated temperature has been exactly 10,0 'C. This temperature is identical to the substitute value in case of double sensor signal failure (according to VAG Self Study Program 208 part II, page 48)
The calculated temp looks correct around freezing point (0'C/32'F) and colder, but never catches up when the car is taken to the warm garage. I even logged the relevant temp info in VAG-COM when I was driving in and out of the warm garage. See enclosed chart screenshot from MS Excel.
I have tried to disconnect the battery for 15-20 minutes, but that did not fix the problem. Is it possible that the circuits that calculate the outside temperature get different sensor temperature values than the OBD system gets and shows me through VAG-COM? When the temperature problem is solved, I can continue to check if my electric cooling fan works...
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Here is a link to the replacement part I used : [URL] .....
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How do i switch from C to F?
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AC Manifold P&A LAB 3.0 5C72 190850 DA - 68oz R134 P&A LAB 1.0 - AC Oil/Dye Kit P&A
Is this an easy task to do?
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