I bought my 2004 XKR last December. The air conditioning system seemed to operate normally during the early spring, so I was surprised when, on the first 90F day, there was no cool air. Plenty of airflow but no cool air. After some research I ran internal diagnostics and found, and reset, Fault Code 11. I'll drive it tomorrow to see if I have cool air. My question: will a fault code 11 cause this lack of cool air?

 

Here is the JTIS information on the A/C unit including how to read codes and what the codes mean:

In your case #11 Motorized in-car aspirator malfunction Harness / connector fault Sensor open / short circuit.
Panel fault codes are not stored for motorized in-car aspirator motor failure.

Hope this helps.
and remember
Happy Motoring...


To check for error codes in the Climate Control System with the internal diagnostics via the ‘Panel

Codes’

1. Ignition off - hold down AUTO and RECIRCULATION buttons and

switch on the ignition

2. press AUTO button - if ZERO shows, there's no stored

error codes

3. press FACE button repeatedly to scroll through stored

fault codes

4. press FACE and HEATED REAR WINDOW buttons together to

clear a fault code.

5. repeat step 4 if there's more than one code

6. press FAN button to exit Interrogation Procedure

.

Control Panel Fault Code Listing

Reference fault code #23*: In ambient temperatures below 0°C, this code may be logged

because the low ambient causes a temporary low gas pressure. Where the ambient temperature

rises above 40°C, with the engine close to overheating, electrical feed to the compressor clutch

may be cut and code #23 registered.

0 Normal operation no fault codes present None Wait 30 seconds for system self-check.

11 Motorized in-car aspirator malfunction Harness / connector fault Sensor open / short circuit

Panel fault codes are not stored for motorized in-car aspirator motor failure.

12 Ambient temperature sensor malfunction Harness / connector fault Sensor open / short circuit

After rectification, disconnect the vehicle battery for 10 seconds to reset the system.

13 Evaporator temperature sensor malfunction Harness / connector fault Sensor open / short

circuit Refer to PDU

14 Water temperature input malfunction Instrument cluster output Refer to PDU

15 Heater matrix temperature sensor malfunction Harness / connector fault Sensor open / short

circuit Refer to PDU

21 Solar sensor Sensor open /short circuit Refer to PDU

22 Compressor lock signal fault Low refrigerant charge, low compressor oil level, loose drive belt

Harness / connector fault Adjust items as required

23 Refrigerant pressure switch malfunction Harness / connector fault Switch open / short circuit

Refer to PDU23 Refrigerant pressure low refrigerant charge *Leak from damaged pipe or joint

Rectify as required and recharge system

24 Face vent demand potentiometer fault Potentiometer open / short circuit Harness / connector

fault Refer to PDU

31 LH fresh / recirc. potentiometer fault Harness / connector fault In certain circumstances the

servo motor may over-travel and cause further logged faults. This may be cured, following fault

rectification, by cycling the ignition ON-OFF-ON 3 times Refer to PDU

32 RH fresh / recirc. potentiometer fault Harness / connector fault In certain circumstances the

servo motor may over-travel and cause further logged faults. This may be cured, following fault

rectification, by cycling the ignition ON-OFF-ON 3 times Refer to PDU

33 Cool air by-pass potentiometer fault Harness / connector fault In certain circumstances the

servo motor may over-travel and cause further logged faults. This may be cured, following fault

rectification, by cycling the ignition ON-OFF-ON 3 times Refer to PDU

 

The AC system loses approximately 5% of refrigerant per year. If it is otherwise working correctly apart from chilling, I would eliminate this before considering possible failure of individual components.

There are DIY kits available for recharging the AC by topping it up or specialists have machines which drain the system entirely and recharge with the correct weight of R134 refrigerant and PAG oil.

Graham

 

Wise advice indeed. If your A/C system has never been serviced, that would be a proper first step....

 

The day after I cleared the fault code I went for a drive and verified that fault code 11 was no longer present - but still no cool air. Time to get out the gauges.

 

I just checked my A/C system which seems to be functioning at some level on my 2003 XKR and got a code of 46 following the procedure listed by vettegood. After clearing the code and operating the system again, the same code returned. Any info available as to what code 46 means and how it is cured?

 

No idea what any of this means but here it is
46 - Foot vent motor fault harness / connector fault servo motor seized or sticking flap seized or sticking, refer to PDU

46 - Foot Vent Servo -
Fault description - Foot vent position not reached within 30 seconds
Possible causes - foot vent servo drive circuit open circuit high resistance or short circuit - Foot vent servo failure