hi Guys

 

Hoping someone can help point me in the right direction with an air con problem.

Last year air con went warm.

Checked on VCDS, low pressure. Got it regassed, was  ok for a short while then low pressure again.

Back to the garage, had 2 pipes replaced, one included the pressure switch (the pipe nearest the compressor).

Regassed, all good for about 6/7 weeks now blowing warm again.

 

This time VCDS shows no faults.

 

Address 08: Auto HVAC Labels: 1K0-907-044.lbl
Part No SW: 1Z0 907 044 AB HW: 1Z0 907 044 AB
Component: ClimatronicPQ35 120 0600
Revision: 00120022 Serial number: 00000000000000
Shop #: WSC 00000 000 00000
VCID: 76E3C779010EFD8E54-8022

No fault code found.

 

Ran a trace and this time the gas presssure looks OK (please see attached log).

Set the car to 16 degrees on Auto (outside temp 20+ degrees) and the blower runs on full whack and never slows because it's pushing warm air around.

 

If someone can take a look at the trace log and make sense of it - that would be most welcomed.

 

Even better if someone could point me in the right direction of what further tests I can do to try and resolve the problem before I have to relent and take it back to the garage.

 

Thanks in advance.

 

 

Edit: Car dash is permanently making a hissing noise which I understand is typical where the gas pressure is low - logs show pressure is OK.

 

Also noticed that the log shows no value for the fresh air intake - which may or may not be relevant (although it does sound like such a sensor value would be important in air con calculations...)

LOG-08-012-02F-037-04F.CSV

Edited 20 July, 20169 yr by nidgep

Have you checked the measuring blocks for the compressor shut off code?

Don't think so, but if memory serves the value was static at 0.

Where do I measure this Tech1e, and what values should I be seeing?

I've, done another VCDS scan and logged the output.

 

 

 

--------------------------------------------------------------------------------
    AUTO @16 degrees
--------------------------------------------------------------------------------

11:32:43 Group 001: General
  0.0  Compressor Shut-Off Code
  800 /min  Engine Speed
  0.0 km/h  Vehicle Speed
  04:00  Standing Time

11:32:43 Group 002: Compressor
  0.820 A  Compressor Current (actual)
  0.820 A  Compressor Current (specified)
  1000 /min  Compressor Rotations
  1.2 Nm  Compressor Load

11:32:43 Group 003
  4.4 bar  Refrigerant Pressure
  9.6 %  Radiator Fan Activation (actual)
  0.0 %  Radiator Fan Activation (spec.)
  ON  Engine Speed (increase)

--------------------------------------------------------------------------------
--------------------------------------------------------------------------------

11:33:02 Group 004: Temperatures
  27.0°C  Outside Temp. Unfiltered
  27.0°C  Outside Temp. Regulation
   -  Fresh Air Intake Temperature
  52.0°C  Coolant Temperature

11:33:02 Group 005: Outlet/Footwell Blower Temperature
  28.0°C  Left Outlet Blower Temperature
  28.0°C  Right Outlet Blower Temperature
  29.0°C  Left Footwell Blower Temp.
  29.0°C  Right Footwell Blower Temp.

11:33:02 Group 006
  25.0°C  Evaporator Temperature
  39.0°C  Interior Temperature
  90.0  Left Sunlight Intensity (G107)
  70.0  Right Sunlight Intensity (G134)

--------------------------------------------------------------------------------
--------------------------------------------------------------------------------

11:33:18 Group 007
     Turbine Voltage (actual)
  12.10 V  Turbine Voltage (specified)
  95.6 %  Turbine Load
  14.20 V  Voltage (Terminal 30)

11:33:18 Group 008
  14.30 V  Voltage (Terminal 15)
       
  0.0 %  Dimming (Terminal 58d)
  0.0  Country

11:33:18 Group 009: Rear Window Heater (Z2) && Aux. Heater
  OFF  Rear Window Heater (Z2 / Actual)
  OFF  Rear Window Heater (Z2 / Spec.)
  OFF  Aux. Heater Status
  0.0  Aux. Heater Current

--------------------------------------------------------------------------------
--------------------------------------------------------------------------------

11:33:34 Group 010
  OFF  Aux. Heater Request
  OFF  Heater OFF
  OFF  Back-Up Lights
  OFF  Front Wiper

11:33:34 Group 011: Air Recirculation Flap Control Motor (V113) / Potentiometer (G143)
     Current Value
     Specified Value
     Minimum Position (Lower Stop/Close)
     Maximum Position (Upper Stop/Open)

11:33:34 Group 012: Left Temperature Flap Control Motor (V158) / Potentiometer (G220)
  33.0  Current Value
  37.0  Specified Value
  37.0  Minimum Position (Lower Stop/Close)
  217.0  Maximum Position (Upper Stop/Open)

--------------------------------------------------------------------------------
--------------------------------------------------------------------------------

11:33:52 Group 013: Right Temperature Flap Control Motor (V159) / Potentiometer (G221)
  31.0  Current Value
  31.0  Specified Value
  31.0  Minimum Position (Lower Stop/Close)
  219.0  Maximum Position (Upper Stop/Open)

11:33:52 Group 014: Center Flap Control Motor (V70) / Potentiometer (G112)
  220.0  Current Value
  219.0  Specified Value
  230.0  Minimum Position (Lower Stop/Close)
  27.0  Maximum Position (Upper Stop/Open)

11:33:52 Group 015: Defroster Flap Control Motor (V107) / Potentiometer (G135)
  35.0  Current Value
  37.0  Specified Value
  225.0  Minimum Position (Lower Stop/Close)
  37.0  Maximum Position (Upper Stop/Open)

--------------------------------------------------------------------------------
--------------------------------------------------------------------------------

11:34:28 Group 016: Air Flow Flap Control Motor (V71) / Potentiometer (G113)
  26.0  Current Value
  28.0  Specified Value
  223.0  Minimum Position (Lower Stop/Close)
  28.0  Maximum Position (Upper Stop/Open)

 

 

The compressor current remains the same as the current (specified).

 

VCDS log info after RPM incease.

 

 

--------------------------------------------------------------------------------
    AUTO  @16 DEGREES WITH RPM INCREASE
--------------------------------------------------------------------------------

11:36:30 Group 001: General
  0.0  Compressor Shut-Off Code
  1800 /min  Engine Speed
  0.0 km/h  Vehicle Speed
  04:00  Standing Time

11:36:30 Group 002: Compressor
  0.820 A  Compressor Current (actual)
  0.820 A  Compressor Current (specified)
  2300 /min  Compressor Rotations
  1.3 Nm  Compressor Load

11:36:30 Group 003
  6.4 bar  Refrigerant Pressure
  9.6 %  Radiator Fan Activation (actual)
  0.0 %  Radiator Fan Activation (spec.)
  ON  Engine Speed (increase)

--------------------------------------------------------------------------------
--------------------------------------------------------------------------------

 

Interestingly, there were times during the scan that measure blocks 002 and 003 threw errors (no info from the controller).

Can anyone advise on the next steps please?

Any advice much appreciated.

These are the values you need to check.

Thanks Tech1e

 

From the log info above these are the values that match the image info.

• 0.0           Compressor Shut-Off Code
• 0.820 A      Compressor Current (actual)
• 0.820 A      Compressor Current (specified)
• 27.0°C      Outside Temp. Unfiltered
• 25.0°C      Evaporator Temperature
• 39.0°C      Interior Temperature

Does this help?

 

I noticed that you had previously posted the following info

 

 

Code for compressor shut off    0
Actual compressor current 0.820 amps
Specified compressor current 0.820 amps
Outside temp
Evap temp
Interior temp

If shut off code is zero, the actual and specified currents and temps all match to one another the compressor is goosed. Will need a new compressor and system flush with a new drier.

 

Based on the info from my scan logs and the info you posted, I'm guessing (hoping) that the compressor is OK?

I would say looking at that the compressor has failed. Interior temp is high but I would guess that's to do with the very hot weather.

It's saying the compressor should be working but isn't. New compressor/oil, system flush and drier.

Oh dear... :-(

 

How much are we talking?

Main dealer around £1600

Ouch!

 

Maybe an email to [email protected] and see if local dealer will fit.

 

Thanks again for your help - will update post once I have more info

Just make sure it's flushed and the oil set correctly or you will be doing it again in no time.

How do you flush the system. I've spoke to two different air con guys who both said you can't flush air con on cars anymore due to the smaller core bars on the condenser and the dryer being part of it. What they did say, if debris so how got into system. You strip it all down and replace parts.

Our AC machine had a flushing system built into it. The dryer is part of the condenser, you just flush through it and replace afterwards. Done God knows how many over the years and if flushed to remove debris and set the oil level right never had one come back for a repeat repair.

Hey meta55b -

I have curently exactly the same problem.

 

At the end, was it your compressor that was bad?

All the best,