Functional Check

Functional Check Flow Chart

Jaguar MK II Air Conditioner In-Car Fault Finding Chart

The procedure provides a check list of six tests on hand and automatic control. The sequence must be strictly followed 1/2 check-out is based on the satisfactory result of previous tests. This method avoids undue repetition of tests and back referencing.


Before the fault finding sequence is started, the car engine must be run to ensure that the water is hot and that there is adequate vacuum in the system. For subjective and cooling tests the engine should be running for the refrigeration compressor to operate.


EQUIPMENT

The chart is based on the availability of the following test equipment:

(i) VOLTMETER - to cover range 0-13V D.C.

(ii) CONTINUITY TESTER - to check for harness breaks

(iii) RESISTANCE METER - up to 20K ohms - to check sensors

(iv) VACUUM GAUGE - (not essential) - to check vacuum level in vacuum tubes.


PROCEDURE

The following sequence must be followed to cover all foreseeable faults:

HAND CONTROL

TEST 1 - "OFF" POSITION

TEST 2 - "DEFROST"

TEST 3 - AUTO - HIGH

TEST 4 - AUTO - LOW

AUTOMATIC CONTROL

TEST 5 - AMPLIFIER/SERVO RESPONSE

TEST 6 - SERVO FUNCTION

A/C Fault Finding:

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