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 MANUALSBMW1987L7 (E23) L6-3430CC 3.4L SOHC (M30)REPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSSYSTEM PERFORMANCE TEST
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)
System Performance Test
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)SECTION System Performance Test
SYSTEM PERFORMANCE TEST
AMBIENT TEMPERATURE/RELATIVE HUMIDITY REFERENCE CHART:
- Verify the complaint.
- Check the blower - is it delivering the necessary volume of air?
- Refer to the Testing and Inspection, and Diagrams / Electrical for detailed diagnosis and repair procedures.
- Inspect/replace the microparticle filters.
- Check the temperature of the air coming out of the A/C outlet ducts.
- Close all the windows and doors.
- Install an additional fan at the front of the vehicle.
- Engine speed = 1500 RPM.
- Blower speed = Medium.
- "Snowflake" button = A/C On.
- Temperature selector = Maximum cooling.
- Insert a thermometer in the center face vent.
- Operate the engine for approximately five minutes to stabilize the A/C system.
- Check the thermometer reading.
- Refer to the chart above and compare the test results.
- If the face vent discharge temperature is well above the indicated temperature for the given humidity and ambient air, perform the checks listed in "Verified System Malfunction Follow-Up".
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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.