Heater blower stop working
SOURCE: 94 bmw 318iC Heater not working
1st thing to check is the coolant level. Low coolant level results in no, or little heat (not enough coolant to circulate thru the heater core). What does your engine temp gauge indicate? (or is it just a warning light?) If the car is running at what appears to be lower than normal temp., u may have a thermostat that's stuck open. This would cause the engine to not reach operating temp, and u would not have heat. Check the above 2 items 1st, then let me know what u found. If that doesn't fix it, we will continue, let's do the easy and not too expensive stuff 1st!
SOURCE: heater blower not working
I don't know if this is a long-term solution but I found it on another "how-to" website: on my 2001 E46 I removed the fuse (#50) for one minute. Something about the transistors inside the FSU (final stage unit, or blower resistor) resetting themselves with the constant power removed. I replaced it and drove home, which is a 1-hr drive, and the fan was on steady the whole time. Which it hasn't done in the 3 yrs I've owned it. I tested it at other speeds and it worked well. Don't know how long it will last though. If not, you need to replace the Blower Resistor - there about $75.
www.bimmerwerkz.com is an excellent source of info! They have pics, utube video, and diagrams to help you.
SOURCE: HEATER FAN ON BMW 323I HAS STOPPED WORKING 2000
FOUND SOLUTION ON WEBSITE INDICATING ELECTRICAL PART REQUIRED.
SOURCE: heater not working on 1994 528i bmw but ac blower works
Hi it sounds like either the thermostat or the heater matrix, although if there is air in the system then this would also cause this fault. get the thermostat checked first as this could cause more damage if not fixed quickly.
The heater matrix or heater core may be blocked or not circulating the warm air, This is a more expensive job if it will not unblock.
Hope this helps
regards
dan
SOURCE: 2003 E39 525d Blower not working
The most common issue is the final stage (electronic resistor) but if this has been replaced its probably the fan motor. Try giving the fan motor a knock. They sometimes get stuck brushes
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