When Climatronic and temperature sensor is tested ready where can be a problem showing digit number and stopping compressor

Did you by chance check for DTC'S diagnostic trouble codes?

Instrument Cluster Diagnostic Trouble Code (DTC) Index DTC Description Source Action B1255 Air Temperature External Sensor Circuit Open Instrument cluster Go To Pinpoint Test E . B1257 Air Temperature External Sensor Circuit Short to Ground Instrument cluster Go To Pinpoint Test E . B2097 Compass Module Failure Instrument cluster Go To Pinpoint Test B . U2013 Compass Module - No Response Instrument cluster Go To Pinpoint Test B . All Other DTCs - Instrument cluster REFER to Section 419-10 .

I expect the CAT isn't lighting up. After a relatively short time of normal driving the closed loop fuel control should produce the ideal conditions to promote the chemical process in the CAT that causes a sudden rise in temperature that begins the conversion process of reducing the harmful and polluting content of the exhaust gas and that is monitored by the post-CAT oxygen sensor.

The electronic brain needs to "see" that reduction in harmful emissions when compared to the pre-CAT oxygen sensor and when it does it should be ready for test.

I expect the CAT isn't working and while they don't last forever, their ruin can be hastened by all sorts of things from mechanical impact or being quenched in cold water (deep puddles), an oil burning engine, too much fuel, a leaky head gasket or merely old and tired sensors.
Your car has reached the sort of age when the overhaul should begin with a fuel pressure test and a fuel injector test...

Did you recently clear the trouble codes or disconnect the battery? Once all codes are cleared, the computer will not display systems 'ready' until they go through an evaluation cycle. Some of the systems require a certain number of drive cycles before they will display 'ready'. A drive cycle is usually starting the engine from a cold start (based on coolant temperature) and driving until certain conditions are met. I don't know what the requirements are for your car, but my 2003 pickup truck requires more than 10 drive cycles before it will make the O2 sensors and evaporative emissions 'ready'. Most states only require that a certain number of systems are showing 'ready' to pass emissions certification.

Could be internal or just a bad connection at the plug.

IF THE CLIMATRONIC DOES NOT GET ANY TEMP OR TEMP BELOW 5 DEGREES CELCIUS IT WONT GO ON!!!THE AC IS NOT WORKING!!!THE PROBLEM U ARE HAVING SEEMS TO BE A BAD CONTACT AT EITHER THE CONNECTOR AT THE TEMP SENSOR OR AT THE CONNECTORS UNDER THE RIGHT SIDE {DRIVERS SIDE}CONNECTORS LOCATED UNDER THE PROTECTIVE CAP OF THE STEERING HYDRAULIC RESERVOIR OR THE PLENUM CHAMBER {BLACK BOX LOCATED AT THE RIGHT SIDE OF THE CAR JUST BESIDE THE SERVO}LET ME KNOW IF U HAVE ANY QUESTIONS!!

Your motor for the temp door may not be working. It is all the way under the dash, toward the back, may be able to reach it and put your hand on it from under the driver-side foot well- but with the windows up so you can hear, listen to hear if the motor runs when operating the temp from cold to hot. If you have Climatronic, take a deep look at Climatronic blend door motor. The Climatronic is a fully controlled system. You absolutely need to use a scan tool to access the diagnostics and code memory. You may just need to clear the DTCs for compressor operation. Also, these are known for temp sensor problems causing no compressor operation. You pressure readings to indicate the clutch is not engaging. If you do need to replace your ac compressor this site looks like it has cheap prices, free shipping and great reviews http://www.buyautoparts.com/autoparts/Volkswagen/Golf/A-C_Compressor.html

Your AC compressor is activated via Climatronic control. The system regulates inside temperature activating the compressor or opening the flap from the heater core. This will be automatic when you set the temp you desired inside the vehicle. Unless you see the words ECON on the right side of the LCD display, your AC compressor will be engaged and the rad fan will operate to prevent the engine from over heating. Press ECON until you see it displayed and it will disengage the compressor and use only the interior blower fan to regulate the inside temp by opening the outside air flap and not from the AC.

• The dual temperature control is inoperative/does not operate correctly

• Circuitry.
• DATC module configuration.
• DATC module.
• Coolant control valve.
• Low coolant level.
• Air trapped in coolant circuit.
• Incorrect heater hose connections.
• Air temperature sensors.

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Visual Inspection Chart Mechanical Electrical

• Loose, missing or damaged A/C compressor drive belt
• Loose or disconnected A/C clutch
• Broken or leaking refrigerant lines
• Obstructed in-vehicle temperature sensor
• Disconnected in-vehicle temperature aspirator hose
• A/C registers are not working (open/close)
• Front floor ducts not in place
• Incorrectly installed in-vehicle temperature sensor
• Incorrectly installed ambient air temperature sensor

• Fuse(s)
• Blower motor inoperative
• A/C compressor inoperative
• Circuit short/open.
• Disconnected, loose fitting, or incorrectly installed electrical connectors and pins
• Cooling fan inoperative
• Relays not functional or not installed

1. As pinpoint tests and measurements are being performed, be sure to inspect for any disconnected, loose fitting, or incorrectly installed component, module and in-line electrical connectors and pins.

1. If the inspection reveals obvious concerns that can be readily identified, repair as necessary.

1. If the concern remains after the inspection, connect the scan tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the scan tool menu. If the vehicle selection cannot be entered:
   • check that the program card is correctly installed.
   • check the connections to the vehicle.
   • check the ignition switch position.
   • check that the battery voltage is greater than 9V.

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you can do this test

The DATC module self-test through the front panel display:

• can be initiated at any time. Normal operation of the system stops when the self-test is activated.
• is entered by pressing the OFF and FLOOR buttons simultaneously and then pressing the AUTO button within two seconds. The display will show counts of 1 to 25 in the center of the display window. Record all DTCs displayed.
• concludes by reporting all on-demand DTCs. Follow the diagnostics procedure given under ACTION in the DTC index for each DTC given.
• reports individual on-demand DTCs as four-digit DTCs (less the alpha character).
• will calibrate all the mode doors and check all analog inputs. The DATC module will only report on-demand (hard) faults that occurred while the DATC module was conducting its self-test.
• will light all control panel display segments if no faults are detected.
• will report individual on-demand DTCs without the °C symbol lit.

To exit the self-test, press any button. This will clear all on-demand codes from the DATC module memory. If no button is pushed DTCs will continue to be displayed.
Upon exit from the self-test the DATC module returns to operational status. The DATC module executes a hard (cold boot) reset which places the DATC system in the OFF mode.
If a condition exists but no DTCs appear during the self-test, GO to Symptom Chart Condition: The DATC System Is Inoperative, Intermittent or Incorrect Operation.
Always exit the self-test before powering the system down (system turned OFF).