Loyale Sedan (3 Door) 4WD F4-1781cc 1.8L SOHC Turbo (1990)
SUBJECT:
THERMOPROTECTOR TESTING PROCEDURE CLARIFICATION
THIS BULLETIN IS TO BE USED AS AN ADDENDUM TO SERVICE BULLETIN 10-58-90 DATED 05-30-90
THERMOPROTECTOR DIAGNOSIS AND SERVICE PROCEDURE CLARIFICATION:
THERMOPROTECTOR FUNCTION (DEFINITION):
The thermoprotector and circuit is designed to open the compressor clutch circuit when the compressor head temperature reaches or exceeds 330~F.
THERMOPROTECTOR'S SERVICE PRECAUTION:
Never attempt to service the compressor's thermoprotector without first completely discharging the A/C system. High side pressure is in contact with the
thermoprotector's internal surfaces. Removal without discharging the A/C system may cause an extreme safety hazard.
THERMOPROTECTOR TESTING:
The thermoprotector circuit must have continuity at temperatures below 330~F. The continuity test can be performed with the A/C system off, see Figure
1.
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Locate the thermoprotector connector and disconnect the thermoprotector from the wiring harness.
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Using a volt-ohmmeter or continuity test light, measure or test for continuity across the two thermoprotector wiring connector terminals
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If the circuit is open or no continuity (ohmmeter shows infinity) the clutch will not engage the A/C system, the thermoprotector must be
replaced.
Follow the replacement procedure in Service Bulletin 10-58-90 dated 05-30-90.