vent temperature sender
 

Hi guys in my quest to solve an air conditioning problem....where my car just sends hot air through my driver's side....I was wanting to pull the temperature sender to test it

Its a bit of a tight squeeze to get to it...but was wondering if anyone had experience in getting this sender out....

the picture appears to suggest one just twists it and pull...is this correct????

Never seen a temp sender fail - I'd check the measuring blocks of the HVAC unit with Vagcom first to see if its wildly off before delving behind the dash ?

temp sender
 

Ian u were right...for my rear blind install i pulled the side trims....so was just a case of having the guts to twist n pull....did it this evening....checked it by measuring the resistance and it was fine....

why would the driver side vent only blow hot aiir...regardless of the temp on the climate control//????

Probably to defrost the side window and keep it clear of mist at all times :cool:

Defrost fine...but burning the driver
 

I wouldn't mind if there was frost on the window..but right now everyone else in the car is cool and I m sweating.....so got to sort this problem
out...

Does anyone know which motor flap controls the air through the drivers side and if it is possible to control the motor flaps through vag com????

In vagcom run an output test on the HVAC unit - It will move every flap and test every sensor - Should point you in the right direction +++

Sit somewhere else ?.... :ROFL:

Oh no.....
 

Well I had a nose around the dash today.....

I learnt alot:::

1...found all the flap motor for most of the air vents
2...found the air channels for the driver side vents
3...found that the flap motor for this vent is tucked up under the dash and behind the speedometer
4...found out that i think my dash has to come out to get to this flap

And i stopped there......

so now that i have to pull the dash to fix the problem....I will take my time and decide on what upgrades to go with in the meantime....

there is a secret way of getting into the controls for all the vents ect.... and you can recalibrate them back to zero and start it up again and track down that you may have a flap that has opened and wont go back to cross over to cold you can play with each induvidual motor with this secret menu

with ignition on (engine running or not) and climate control on, press upper vent button on driver's side and recirculate button simultaneously. The code # will appear on driver's side temp window and associated value appears in passenger's side temp window. You can scroll through codes 1-149 with "+" or "-" buttons on drivers side. Below you'll find the best reverse engineered list of code designations and associated value numbers.

This is all for Facelift D2 A8/S8

For each line in the group below,
first address: actual flap position, corresponding to field 1 in the display group
second: specified position as a percentage of open, can be changed with the fan -/+ buttons. These values persist after returning from Defog. Pushing Auto returns them to defaults.
third: basic settings closed flap value
fourth: basic settings open flap value
11, 12, 74, 75 Temperature regulator flap motor -V68- [heated air to center vent], display group 6
13, 14, 76, 77 Left center vent motor -V110-, display group 3
15, 16, 78, 79 Center vent adjusting motor -V102- [unheated air to center vent], display group 5
17, 18, 80, 81 Right center vent motor -V111-, display group 4
19, 20, 82, 83 Rear footwell [console] vent motor -V119, display group 9
21, 22, 84, 85 Left footwell flap motor -V108-, display group 7
23, 24, 86, 87 Right footwell flap motor -V109-, display group 8
25, 26, 88, 89 Defroster flap motor -V107-, display group 2
27, 28, 90, 91 Airflow flap motor -V71- [fresh air intake], display group 10
29, 30, 92, 93 Recirculation flap motor -V113-, 0% = open, display group 11

33 Speed km/h
34 Fresh air blower -V2- actual voltage, display group 16 field 2
35 Fresh air blower -V2- specified voltage, display group 16 field 1, adjust with fan -/+ buttons
36 Voltage in
37 Voltage in

41 What the fresh air blower voltage would be in AUTO
42 Fresh air blower -V2- specified voltage as in 35, not adjustable

49 Unscaled battery voltage, about 175 engine on, 155 engine off, lower during cranking
50 as for 49

54 Display illumination percentage, depends on instrument cluster brightness sensor and buttons, display group 16 field 3
55 Button illumination, depends on instrument cluster brightness sensor and buttons. 0 with parking lights off. Twice the percentage in display group 16 field 4.

59 rpm/10

64 0-255, larger = more cooling or less heat demand

68 Heating demand satisfaction, 0-255. Heat regulating valves -N175- and -N176- stay closed when this reaches 255.

72 Recirculation flap motor -V113-, specified position % closed, follows 30 but not adjustable
73 Airflow flap motor -V71- [fresh air intake], specified position % open, follows 28 but not adjustable

74-93 see 11-30

102 Coolant temperature from instrument cluster
103 Appears to follow 107
104 Instrument panel interior sensor -G56-
105 Fresh air intake duct temperature sensor -G89-
106 Outside air temperature sensor -G17-
107 The lower of -G89- or -G17- values
108 Left vent temperature sensor -G150-
109 Right vent temperature sensor -G151-
110 Sunlight photosensor -G107-, left, % as reported in display group 15 field 3, but can go over 100
111 Damped left sunlight value, follows 110 slowly
112 Left sunlight value as a percentage of right sunlight value, 255 if no right sunlight
113 Sunlight photosensor -G107-, right, % as reported in display group 15 field 3, but can go over 100
114 Damped right sunlight value, follows 113 slowly

120 0-255, larger = more cooling or less heat demand, slowly adjusts to sunlight without regard to its direction
121 appears to follow 120

123 appears to follow 120, taking into account damped left sunlight value

125 appears to follow 120

127 appears to follow 120, taking into account damped right sunlight value
128 appears to follow 127


hope this can help it looks confusing but when you get into the menu it will all make sense

True, could be useful, and thanks for posting the detail, but it is a zillion times more user friendly just to use vagcom +++