on my 2.8 quattro, when the climate control is set to any kind of hot temperature, the most i get is barely lukewarm air coming out. Any idea what could cause this please guys?
Lukewarm climate control
- Thread starter tomti
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HerefordQuattro
Registered User
usualy means there is not enough heat in the engine coolant, does the water temp gauge get up to temp approx 90deg? If not then may be the thermostat. Sorry not familiar with your engine so not sure how hard to change. If it does get up to temp like mine did then you can double check the temp with vcds. If defo hot then i'd advise a coolant flush as it sorted mine, used 2 part holts flush from halfords then refilled with G12+ from dealer and bled system to make sure heater matrix filled. Hope that helps
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Mine did the opposite, always hot regardless of the setting, and it was the temperature vent flap motor which had failed.
If you view the diagnostics on the climate panel theres one called "temperature flap malfunction count", on mine this was wildly climbing.
If you view the diagnostics on the climate panel theres one called "temperature flap malfunction count", on mine this was wildly climbing.
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Hold recirc then press the upwards arrow.
Display will show "1c"
you can then use temp + and - to change the number shown.
Change it so it displays 32c, then press recirc again, and it will show you the error count for the temperature flap.
You can also use 49c to display the actual coolant temperature, rather than the fake one shown on the dash.
Display will show "1c"
you can then use temp + and - to change the number shown.
Change it so it displays 32c, then press recirc again, and it will show you the error count for the temperature flap.
You can also use 49c to display the actual coolant temperature, rather than the fake one shown on the dash.
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I guess thats a start, and implies the flap motor is fine.
did you check 49c?
I'd be tempted to try a flush as posted above, and/or check for an airlock in the matrix using the bleed hole.
did you check 49c?
I'd be tempted to try a flush as posted above, and/or check for an airlock in the matrix using the bleed hole.
THe 49 one came up with 22.something. ok mate thanks for your help I'll stick it in for a flush when I get a chance
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ok mate have to wait till i got it back as its at my mates garage while he investigates the misfire. will keep you posted 
HerefordQuattro
Registered User
sorry to hijack thread but is there a definitive list of the codes used to interrogate the hvac and the codes it gives back?
reason i ask is my vcds keeps timing out trying to connect to the hvac controller so i'm trying to attack it from a different angle!
cheers
reason i ask is my vcds keeps timing out trying to connect to the hvac controller so i'm trying to attack it from a different angle!
cheers
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Thats not correct unfortunately.
There are a few differences between that list and our cars. The most frequent i see is that "49" isnt Malfunction count for Speedo, its coolant temperature. "51" is just rubbish.
Theres another page floating around somewhere that has a more accurate list.
There are a few differences between that list and our cars. The most frequent i see is that "49" isnt Malfunction count for Speedo, its coolant temperature. "51" is just rubbish.
Theres another page floating around somewhere that has a more accurate list.
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Enter diagnostic mode: Circulating air + arrow upward
Channel number input: +/- temperature buttons
Enter Selected Channel: Circulating button
1. System error
2. actual value feeler virtually
3. actual value interior feeler console
4. actual value outside temperature - feeler wasserkasten
5. actual value outside temperature - feeler bumper
6. actual value blowing out feeler floor space
7. actual value blowing out feeler man Anstroemer
8. display check
9. actual digital value acknowledging potentiometer temperature flap
10. Target digital value temperature flap
11. Actual digital value acknowledging potentiometer A/C flap
12. Target digital value A/C flap
13. Actual digital value acknowledging potentiometer Fuss/Def flap
14. Target digital value Fuss/Def flap
15. Actual digital value acknowledging potentiometer ram air flap
16. Target digital value ram air flap
17. Driving speed (km/h)
18. Actual value of the blower tension (volt)
19. Desired value of the blower tension (volt)
20. Actual value of the compressor/on-board tension (volt)
21. Number of low-voltage events (not volatile)
22. Switching status of the high pressure switch
23. Number of high pressure events (volatile)
24. Number of high pressure events (not volatile)
25. A/D value kickdown switch
26. A/D value hot light
27. Engine speed
28. Compressor number of revolutions
29. Coding
30. Software-Version
31. Software index
32. Potentiometer error counter temperature flap
33. Potentiometer error counter A/C flap
34. Potentiometer error counter Fuss/Def flap
35. Potentiometer error counter ram air flap
36. Temperature flap notice cold
37. Temperature flap notice warm
38. A/C flap notice closed
39. A/C flap notice opened
40. Fuss/Def flap notice Def
41. Fuss/Def flap notice foot
42. Ram air flap notice on
43. Ram air flap notice to
44. Operating cycle counter
45. Interior temperature counted (Ninc) dig
46. Outside temperature filtered (°C)
47. Outside temperature not filtered (°C)
48. ECOR
49. Coolant temperature
50. Service life in min
51. Engine temperature °C
52. Compressor switching off conditions
53. Announcement more actively el. Exits: Compressor/circulating air valve/water valve
54. Rule index
55. Outside temperature °C
56. Interior feeler virtually °C
57. Interior feeler console °C
58. Temperature wasserkasten °C
59. Temperature bumper °C
60. Blowing out feeler floor space °C
61. Blowing out feeler man Anstroemer °C
62. Sun intensity W/m-1
63. Sun intensity filtered W/m-1
64. Delta exhaust rise 65. Delta A/C Klappenverschiebung
66. Time constant/1.6 seconds of
67. Cold weather starting correction
68. Maximum correcting variable for i and p-portion of
69. Actual value blowing out feeler foot (cnts)
70. Desired value blowing out feeler foot (cnts)
71. Deviation (Epsilon)
72. Portion (+ heat/- cool)
I edited it a little bit.
Hopefully it makes it a bit easier to read and still correct.
Channel number input: +/- temperature buttons
Enter Selected Channel: Circulating button
1. System error
2. actual value feeler virtually
3. actual value interior feeler console
4. actual value outside temperature - feeler wasserkasten
5. actual value outside temperature - feeler bumper
6. actual value blowing out feeler floor space
7. actual value blowing out feeler man Anstroemer
8. display check
9. actual digital value acknowledging potentiometer temperature flap
10. Target digital value temperature flap
11. Actual digital value acknowledging potentiometer A/C flap
12. Target digital value A/C flap
13. Actual digital value acknowledging potentiometer Fuss/Def flap
14. Target digital value Fuss/Def flap
15. Actual digital value acknowledging potentiometer ram air flap
16. Target digital value ram air flap
17. Driving speed (km/h)
18. Actual value of the blower tension (volt)
19. Desired value of the blower tension (volt)
20. Actual value of the compressor/on-board tension (volt)
21. Number of low-voltage events (not volatile)
22. Switching status of the high pressure switch
23. Number of high pressure events (volatile)
24. Number of high pressure events (not volatile)
25. A/D value kickdown switch
26. A/D value hot light
27. Engine speed
28. Compressor number of revolutions
29. Coding
30. Software-Version
31. Software index
32. Potentiometer error counter temperature flap
33. Potentiometer error counter A/C flap
34. Potentiometer error counter Fuss/Def flap
35. Potentiometer error counter ram air flap
36. Temperature flap notice cold
37. Temperature flap notice warm
38. A/C flap notice closed
39. A/C flap notice opened
40. Fuss/Def flap notice Def
41. Fuss/Def flap notice foot
42. Ram air flap notice on
43. Ram air flap notice to
44. Operating cycle counter
45. Interior temperature counted (Ninc) dig
46. Outside temperature filtered (°C)
47. Outside temperature not filtered (°C)
48. ECOR
49. Coolant temperature
50. Service life in min
51. Engine temperature °C
52. Compressor switching off conditions
53. Announcement more actively el. Exits: Compressor/circulating air valve/water valve
54. Rule index
55. Outside temperature °C
56. Interior feeler virtually °C
57. Interior feeler console °C
58. Temperature wasserkasten °C
59. Temperature bumper °C
60. Blowing out feeler floor space °C
61. Blowing out feeler man Anstroemer °C
62. Sun intensity W/m-1
63. Sun intensity filtered W/m-1
64. Delta exhaust rise 65. Delta A/C Klappenverschiebung
66. Time constant/1.6 seconds of
67. Cold weather starting correction
68. Maximum correcting variable for i and p-portion of
69. Actual value blowing out feeler foot (cnts)
70. Desired value blowing out feeler foot (cnts)
71. Deviation (Epsilon)
72. Portion (+ heat/- cool)
I edited it a little bit.
Hopefully it makes it a bit easier to read and still correct.
HerefordQuattro
Registered User
Great info guys but can i just ask, regarding 49 and 51 ('99 S4 Avant 2.7 V6).
What are the sensors associated with these readings?
I assume engine temperature is a sensor actuallly located on the block?
What is the relationship between these readings and the coolant temp gauge on the dash?
I ask because my dash coolant temp gauge fluctuates and I plan to use the coolant temp reading on the hvac display to see if it is the sensor or the stat. I alsdo have VCDS so alternatively can anyone tell me what blocks refer to the engine coolant temperature?
Also, what temperature should the oil be sitting at on the dash gauge in normal town driving with engine warm?
Cheers,
Ross.
What are the sensors associated with these readings?
I assume engine temperature is a sensor actuallly located on the block?
What is the relationship between these readings and the coolant temp gauge on the dash?
I ask because my dash coolant temp gauge fluctuates and I plan to use the coolant temp reading on the hvac display to see if it is the sensor or the stat. I alsdo have VCDS so alternatively can anyone tell me what blocks refer to the engine coolant temperature?
Also, what temperature should the oil be sitting at on the dash gauge in normal town driving with engine warm?
Cheers,
Ross.
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No, "51c" is a sort of virtual computation by the Aircon ECU. It will often show 90 when the main temp is nowhere near that.
"49c" is an exact output of the coolant sensor that feeds the dash. The dash sort of lies, in that its slow to respond, and displays any temp from 80c to over 100c as "90". 49c doesnt lie, and tells you exactly what the sensor is reporting.
Oil temp will show around 80-90c once the engines fully warmed up.
"49c" is an exact output of the coolant sensor that feeds the dash. The dash sort of lies, in that its slow to respond, and displays any temp from 80c to over 100c as "90". 49c doesnt lie, and tells you exactly what the sensor is reporting.
Oil temp will show around 80-90c once the engines fully warmed up.
