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REPORT NUMBER - BMW3997421 MAKE BMW | MODEL E39 535 YEAR 04-1997 | ENGINE 6 cylinder
Customer Complaint
No interior fan on any setting
Problem Summary
Climate control, interior fan motor not operating on any speed. All climate control functions working and LCD display for fan control working correctly showing variable speeds, as the system has a variable speed fan.
Diagnostic Sequence
Test all fuses and circuit breakers in the fuse box to check power supply to fan control system. Then scan the electronic control systems with an appropriate scan tool.
image 1
Remove the under dash panels on the drivers side to access the fan variable speed controller (image 1)
image 2
Find the variable fan speed resistor and check the wiring connections for power (image 2)
Fault Description
The fault on this car is in the variable resistor that controls the fan speed for the internal ventilation system (image 3).
First you need the replacement part from BMW, resistor part no. 64116923204. Make sure that you check the chassis no. with BMW on ordering because they do vary between models. Fit the new resistor into the hole with the two required screws install the wiring and then test the fan operation. All should again be working correctly, you may also want to check that there are no error codes stored in the computer using an appropriate scan tool.
image 3
Recommended Time
In our situation our labour time for this job was 2.5 hrs, this is taking into account research time , location of parts and the actual time spent fixing the problem.
Useful Tips
For further information on BMW common faults and problems visit The Automotive Technicians website at www.theautomotivetechnician.com.au
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