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.
12 90 100 Replacing blower for electronics box
Necessary preliminary tasks:
- Remove control unit. See 13 61 501 REPLACING CONTROL UNIT (DDE) .(excl. N55) .
- Read fault memory.
- Switch off ignition.
Unclip connector (1).
Remove control unit (3).
Remove relay module (5) upwards.
Release screws (4).
Lift out oil equipment holder (2).
Unlock plug connection and disconnect.
Release air scoop (1).
Remove electric fan (2) with bracket.
Reassemble the vehicle.
Read fault memory.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.