1997 Jaguar XJ6 Blower motors will not run

On all blower speeds except high, the ground circuit for each blower motor is via power transistor and A/CCM, allowing an infinite number of blower speeds. The A/CCM increases or reduces blower speed in correlation to vehicle speed, minimizing ram air effect. The A/CCM cuts off blower voltage if heating is selected when coolant temperature is below 86°F (30°C).

RETRIEVING TROUBLE CODES
System Self-Test
Ensure ignition is in OFF position. Press and hold AUTO and fresh/recirculated air buttons. See Fig. 1 . Turn ignition to ON position while holding buttons.
All A/C-heater control panel lights and segments will flash on and off. If any lights or segments do not light, an A/C-heater control panel or light fault is indicated. Press AUTO.
NOTE:If "0" is displayed, there are no stored fault codes, wait 30 seconds for system self-test to finish.

Press face vent mode button. This button will allow scrolling through stored fault codes. The A/C-heater control panel will flash 2 digit fault codes. See FAULT CODES table.
A fault code followed by a beep indicates an active fault code. A fault code not followed by a beep indicates an inactive fault code stored in memory.

Could you give me a link to the fault code you referenced.

FAULT CODES
Fault Code....ComponentFault
0....Normal OperationNo Fault Codes, Wait 30 Seconds For System Self-Test
11..... Motorized In-Car AspiratorOpen/Short Circuit, Code Not Stored For Blown Aspirator
12..... Ambient Temperature SensorOpen/Short Circuit
13.... Evaporator Temperature SensorOpen/Short Circuit
14.... Coolant Temperature InputInstrument Pack Output
15 ....Heater Matrix Temperature SensorOpen/Short Circuit
21... Solar SensorOpen/Short Circuit
22 ...Compressor Lock SensorOpen/Short, Low Refrigerant Charge, Low Compressor Oil, Loose Belt
23... Refrigerant Pressure SwitchOpen/Short, (1) Low Refrigerant Charge
24 ...Differential PotentiometerOpen/Short Circuit
31 ...Left Fresh/Recirculated Potentiometer(2) Open/Short Circuit
32 ...Right Fresh/Recirculated Potentiometer(2) Open/Short Circuit
33... Cool Air By-Pass Potentiometer(2) Open/Short Circuit
34... Defrost Potentiometer(2) Open/Short Circuit
35 ...Center Vent Potentiometer(2) Open/Short Circuit
36 ...Foot Potentiometer(2) Open/Short Circuit
41 ...Left Fresh/Recirculated Servo Motor(3) Open/Short Circuit
42 ...Right Fresh/Recirculated Servo Motor(3) Open/Short Circuit
43 ...Cool Air By-Pass Servo Motor(3) Open/Short Circuit
44 ...Defrost Servo Motor(3) Open/Short Circuit
45 ...Center Vent Servo Motor(3) Open/Short Circuit
46 ...Foot Servo Motor(3) Open/Short Circuit
(1)Temperatures below 32°F (0°C) may set false fault code due to low refrigerant pressure. Temperatures above 95°F (35°C) may set false fault code due to temporary high refrigerant pressure.
(2)Open or short in potentiometer feed circuit. At times, motor may overrun and set additional codes. Cycling ignition on and off 2 or 3 times may correct problem.
(3)Open or short in motor drive circuit or sticking or jammed motor flap.

I know what code 23 would mean. The system needs to be recharged. There is probably a leak in the system. What would be some things to check for the code 24 Differential Potentiometer Open/Short Circuit. Also is there a blower motor resitor on this vehicle and where would this be located?