I have a 2000 A6 2.7T. When I first turn on the climate control, everything works great. Air is cold and fan blows well. Then slowly, the air blows less and less. About 20 minutes later, I barely have any air coming out of the vents. What does come out is still cold. At that point, even if I manually control the air blowing level and direction, all that happens is that I hear the fan running louder and louder. The only thing that I found to work is to press the ECON button. About aminute after pushing the ECON button, everything returns to normal. Thanks for any help you can provide.

 

Possible complaints
Note[/align]


t
For all complaints marked *, refer to →Chapter“Checking pressures”.



t
If problems are only encountered at one evaporator on vehicles fitted with two evaporators, also check the pressures in the refrigerant circuit.



t
Total cooling system failure *



t
Insufficient cooling output at all vehicle or engine speeds *



t
No or insufficient cooling after driving a few miles *



t
No or insufficient cooling at one or both evaporators (on vehicles with two air conditioner units). *



t
Compressor, air conditioning system magnetic coupling -N25- or air conditioning system compressor regulating valve -N280- shut off by pressure switch (e.g. -F73, -F118, -F129- or air conditioning system operating and display unit -E87- or Climatronic control unit -J255-) on account of excessive or inadequate pressure *



t
No or sharp decrease in fresh-air supply after driving several miles (evaporator iced up) *



Other possible problems:



Compressor noise



–
Re-tighten securing bolts for compressor and compressor bracket with a torque wrench.



–
Check routing of refrigerant pipes; they must not touch other components and must not be subject to strain (align if necessary).



Noise (refrigerant hammer) occurring immediately after switching on air conditioner and/or when cornering or braking:



–
Discharge, evacuate and re-charge refrigerant circuit (too much refrigerant in circuit).
Note[/align]


Too much refrigerant oil in the circuit may also result in this problem (no adjustment of refrigerant oil quantity, for example, on replacing compressor).



Water sprays out of vents (in dash panel or footwell) although air conditioning system is otherwise functioning properly:



–
Check proper routing of condensate drain; it must not be crushed or kinked.



–
Check condensate drain valve; it must not be gummed up with wax or underseal and must close properly.



–
Check plenum chamber cover; it must not be damaged and must be properly installed (to stop water running into evaporator).



–
Check water drains in plenum chamber; they must not be blocked (e.g. by leaves).

 

Components for the control and regulation of the air conditioner (in the engine compartment)[/align]Components for the control and regulation of the air conditioner (in the engine compartment)[/align]









Notes:

â—†After completing repair work, always interrogate and erase fault memory, perform basic setting, and check the encoding of -E87.
â—†To drain the refrigerant circuit, vehicle must be taken to a specialist air conditioner workshop.
â—†Check refrigeration capacity =>Page 87-173.
â—†Servicing the refrigerant circuit =>Page 87-10.
â—†All components marked with * are actuated during the final control diagnosis => Page 01-99. [/ul]










â—†Note the different codes for operating and display unit -E87 => Page 01-146.
â—†An electrical check can be performed on all components marked with ** =>Page 01-285. [/ul]

Vent frame for forced air extraction

â—†The sealing lips on the vent frame must be able to move freely and close by themselves (Checking =>Page 87-104). [/ul][/ul]
Note:
In order for the vehicle interior ventilation to work properly, the air ducts which run through the luggage compartment trim and lead to the two vent frames (under the bumper on the left and right) must be unobstructed.










Compressor (with magnetic clutch -N25) [/ul]
Important:
The compressor may be removed only if the refrigerant circuit is empty.[/align]Notes:

â—†The procedure for work on the compressor, removing and installing ribbed belt, detaching and re-attaching compressor from/to bracket, removing and installing compressor bracket, differs according to the type of engine and the design of the compressor. See servicing refrigerant circuit Page 87-28 onwards and [/ul]
=> Relevant Engine Workshop Manual, Mechanical Components; Repair group 13

â—†The compressor is installed on the right or left of the engine depending on the engine type [/ul]










â—†Only compressors with magnetic clutch -N25 were installed until model year 2001. Depending on the engine version, from model year 2002 a compressor with magnetic clutch -N25 or regulating valve -N280 will be installed=>Pages 01-27 and [/ul]
=> Parts List

Air-conditioner magnetic clutch -N25 * [/ul]
Note:
Only compressors with magnetic clutch -N25 were installed until model year 2001. Depending on the engine version, from model year 2002 a compressor with magnetic clutch -N25 or regulating valve -N280 will be installed=>Pages 01-27 and
=> Parts List











â—†Servicing magnetic clutch -N25. [/ul]

‒"Zexel" compressor => Page 87-42.
‒"Denso" compressor =>Page 87-48. [/ul]

â—†Checking and adjusting gap width between pulley and clutch plate of magnetic clutch. [/ul]

‒"Zexel" compressor => Page 87-42.
‒"Denso" compressor =>Page 87-48. [/ul][/ul]










Condenser [/ul]
Important:
The condenser may be removed only if the refrigerant circuit is empty.[/align]
Ambient temperature sensor -G17**

â—†Removing and installing: [/ul]

‒Unclip sensor from mount in bumper.
‒Remove bumper (only for a -G17 in which the connector is not directly on the -G17). [/ul][/ul]
=> General Body Assembly, Exterior; Repair group 50; Body front; Lock carrier service position


‒Detach connector. [/ul][/ul]










Air conditioner pressure switch -F129**/high-pressure sender -G65 **

â—†Function, removing and installing pressure switch -F129 => Page 87-23
â—†Function, removing and installing high-pressure sender -G65
=>Page 87-22
â—†The measured value of high-pressure sender -G65 is displayed in the function "Reading measured value block" of operating and display unit -E87 => Page 01-348
â—†Fitting location in all vehicles except 2.0l and 3.0l petrol engine [/ul][/ul]
Notes:

â—†Up to model year 2001 pressure switch -F129 was installed, in vehicles from model year 2002 the high-pressure sender -G65 is installed instead of pressure switch -F129 (different version of the -E87). [/ul]










â—†Pressure switch -F129/high-pressure sender -G65 may also be attached on the left of the condenser, depending on the condenser version. [/ul]

Reservoir [/ul]
Important:
The reservoir may be removed only if the refrigerant circuit is empty.[/align]
Condensation drainage valve

â—†Checking, removing and installing =>Page 87-100. [/ul]
Restrictor

â—†Installed in the refrigerant pipe [/ul][/ul]
Important:
The union is only to be opened if the refrigerant circuit is empty.[/align]










Service connection

â—†High-pressure side
â—†For specialist air conditioner workshops, for measuring, draining and filling. [/ul][/ul]
Note:
Always screw on cap with seal.

Service connection

â—†Low-pressure side
â—†For specialist air conditioner workshops, for measuring and draining. [/ul][/ul]
Note:
Always screw on cap with seal.

Dust and pollen filter:

â—†Removing and installing => Page87-105. [/ul][/ul]











â—†Observe change intervals [/ul][/ul]
=> Maintenance Manual


â—†Different versions (with or without activated charcoal filter layer => Page 87-106) [/ul][/ul]

Air flow flap

â—†Removing and installing positioning motor -V71* (with potentiometer -G113) =>Page 87-136.
â—†In vehicles up to model year 2001 positioning motor -V71 not only moves the air flow flap, but also the fresh/recirculated air flap (air flow flap is closed in recirculated air mode).
â—†For vehicles with right-hand drive note the information on the relevant display groups in the function "Reading measured value block" =>Page 01-157 [/ul][/ul]










Fresh/recirculated air flap

â—†In vehicles up to model year 2001 moved together with the air flow flap by positioning motor -V71.
â—†From model year 2002 the fresh/recirculated air flap is moved by positioning motor -V113 =>Page 01-235 display groups "008" and "009" in the function "Reading measured value block"
â—†For vehicles with right-hand drive note the information on the relevant display groups in the function "Reading measured value block" =>Page 01-157 [/ul][/ul]










Sunroof with solar cells

â—†Testing operation => Page 01-379
â—†Removing and installing [/ul][/ul]
=> General Body Assembly, Exterior; Repair group 60

Air quality sensor -G238

â—†Function => Page 01-387
â—†Checking => Page 01-389
â—†Removing and installing
=>Page 87-108 [/ul][/ul]
Note:
The air quality sensor -G238 is installed in vehicles from model year 2002 (change in design of the -E87)

Radiator fan control unit -J293*

â—†Only installed in vehicles from model year 2002 with a 2.0l or 3.0l petrol engine [/ul][/ul]









Notes:

â—†The type of actuation of the radiator fan depends on the model year of the vehicle and the engine version [/ul]
=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder

â—†The type of actuation of the radiator fan in vehicles from model year 2002 => Page 01-252 (Reading measured value block, display group 014) [/ul]
=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder
=> Relevant Workshop Manual Ignition and Injection System; Repair group 01
=> Relevant Workshop Manual, Diesel Direct Injection and Glow Plug System; Repair group 01
=> Parts List










Air conditioner high-pressure sender -G65

â—†Function, removing and installing
=>Page 87-22
â—†The measured value of the sender is displayed in the function "Reading measured value block" of operating and display unit -E87 => Page 01-348
â—†Fitting location in vehicles with 2.0l and 3.0l petrol engine [/ul][/ul]
Note:

â—†In vehicles from model year 2002 the high-pressure sender -G65 is installed instead of the pressure switch -F129 (change in design of the -E87).
â—†High-pressure sender -G65 may also be attached on the right of the condenser, depending on the condenser version. [/ul]










Compressor (with regulating valve -N280)

â—†Replace pulley =>Page 87-62.
â—†Checking, replacing compressor drive unit => Page 87-70 [/ul][/ul]
Important:
The compressor may be removed only if the refrigerant circuit is empty.[/align]Notes:

â—†The procedure for work on the compressor, removing and installing ribbed belt, detaching and re-attaching compressor from/to bracket, removing and installing compressor bracket, differs according to the type of engine and the design of the compressor. See servicing refrigerant circuit Page 87-28 onwards and [/ul]
=> Relevant Workshop Manual Engine, Mechanical Components; Repair group 13










â—†The compressor is installed on the right or left of the engine depending on the engine type
â—†Only compressors with magnetic clutch -N25 were installed until model year 2001. Depending on the engine version, from model year 2002 a compressor with magnetic clutch -N25 or regulating valve -N280 will be installed=>Page 01-27 and [/ul]
=> Parts List










Regulating valve for air conditioner compressor -N280 *

â—†Check actuation and function => Page 01-352 [/ul][/ul]
Note:
Only compressors with magnetic clutch -N25 were installed until model year 2001. Depending on the engine version, from model year 2002 a compressor with magnetic clutch -N25 or regulating valve -N280 will be installed=> Page 01-27 and
=> Parts List

[IMG]local://upfiles/12092/05226F2EAA904962ACC3BBD6EFFE6E7D.jpg[/IMG]

 

Thanks for the response, but can you be more specific. Have you seen this problem before?

 

how specific can I get??

 

You can quit being a ******* retard and posting useless bullshit nobody wants to read. I am a tech also and have worked with guys like you, Google doesn't doesn't help at work does it? I don't even undstand that bullshit you like to post. You probably passed all8 ASE's first try too, good job, do you actually know how to turn a wrench or diagnose a problem? I have worked with geniuses that could pop off alignment specs from an 88 celebrity but when it comes time to put back in the caliper bolts they forget to tighten them, or forget to pump the brakes before driving the car and hit the brick wall behind them. The smartest tech I ever met fucked up more than my 7 year old would if he had a wrench in his hand and the posts you make remind me of that tech.

Gitpark, are you sure the auto function isn't on while the air is running? Auto will get the interior to the desired/set temp. and decrease fan speed once the car is at that temp. Try setting it to acertain lets say 70 degrees them when the fan slows down turn theTEMP. down to the lowest setting, the fan should turn back on high. If the auto buttom is lit up the auto function is on. To run without auto function on press the auto button to shut off air cond. and press econ to turn it back on and be sure the auto light is off.