Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW1993740IL (E32/2) V8-3982CC 4.0L DOHC (M60)REPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSCOMPONENT TESTING - IHKA (AUTOMATIC CLIMATE CONTROL SYSTEM)A/C COMPRESSOR CLUTCH DOES NOT ENGAGE
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
A/C Compressor Clutch Does Not Engage
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION A/C Compressor Clutch Does Not Engage
A/C Compressor clutch does not engage "^D^206 Status list/44 A/C relay" indicates "ON" and ^D^900/04 IHKA defect code overview" indicates "No defect code stored"
Possible cause:
Fuse F9, relay working circuit, refrigerant low pressure switch, refrigerant high pressure switch, incorrect refrigerant level, A/C compressor clutch with quenching diode or connections in working circuit defective
NOTE: The A/C relay is not driven by the IHKA control unit for as long as the A/C relay is stored as defective by the IHKA control unit.
Test prerequisite:
Correct refrigerant level, fuse F9 and system voltage OK
NOTE: In the case of defect "A/C compressor clutch does not engage" in the Series 750i, the lock sensor additionally installed in these vehicles must be checked first.
Troubleshooting Charts
Possible cause:
Fuse F9, relay working circuit, refrigerant low pressure switch, refrigerant high pressure switch, incorrect refrigerant level, A/C compressor clutch with quenching diode or connections in working circuit defective
NOTE: The A/C relay is not driven by the IHKA control unit for as long as the A/C relay is stored as defective by the IHKA control unit.
Test prerequisite:
Correct refrigerant level, fuse F9 and system voltage OK
NOTE: In the case of defect "A/C compressor clutch does not engage" in the Series 750i, the lock sensor additionally installed in these vehicles must be checked first.
Troubleshooting Chart-Part 1:
Troubleshooting Charts
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.