B0186Front Blower Motor Speed Performance
- Generic OBD-II code · Body
- How the car detects it
- B0186 is not in the publicly available J2012 lists, and no manufacturer uses it for front blower speed. Saab assigns it to the solar sensor of the 9-3: B0186 01 is a short to B+ in that circuit, after which the climate control assumes cloudy weather. A speed performance fault, as the title puts it, differs from the circuit faults B0181 and B0283: the wiring is intact, but the fan does not turn at the commanded speed. Denso's patent US10300764B2 shows how a blower control module checks this with a Hall sensor. If the rotor has not moved after about 2.7 s it reports a locked rotor to the climate module, power is cut and a in one example a restart follows after 20 s, five times at most until the next start. US5554913A names the classic cause: foreign objects sucked into the intake jam the wheel.
- What you may notice
- Blower speed does not match the selected stage or fluctuates
- Fan stops and restarts after a pause, sometimes with a grinding noise
- Likely causes
- LikelyLeaves or other debris drawn in through the air intake, braking or jamming the fan wheel
- PossibleWorn blower motor bearings or brushes, motor runs slowly or stalls
- RareHeavily clogged cabin filter loading the motor
- Repair
- Medium · Often possible to do yourself.Typical cost: €30 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.