1988 bmw 325is heater keeps blowing 30amp fuse, tried to find a short but me heater blower fan isnt working what could be the problem. cant keep a fuse without blowing

It sounds like a short somewhere in the wiring to that system. You'll have to test all of the wires with an ohm meter to find it. It's easier if you have the wiring diagram for it

Why does the heater fuse keep blowing
This place offers a few suggestions, like fan motor old and pulling too much current, or fan switch, ect

Either you have a short to ground in the wiring harness or heater relay is bad. the relay I am referring to is generally located close to the blower motor and acts as a Potentiomiter to control fan speeds.

If it doesn't blow at all, and/or you only feel a small amount of air coming through the vents (not forced), it may be the blower motor switch.

Sounds as though the fan motor could have failed (the noise), if you have fitted a new resistor pack and the fuse is OK, probe around with a multi-meter tracing the supply (12Volts to ground) through switch to the fan. The heater/aircon blower is fuse 64 - 30amp (if I dont mistake). If the motor itself is shorting out then this would blow this fuse. Try a 12v feed direct to the motor terminal and see if it works.

Hope this helps.

hi

the problem lies with the selector switch.there is some short circuiting taking place inside the switch.so please replace the selector switch.

if my information was usefull please rate me

dead battery or ecu or less bite has clapst

maybe you have caused a short somewhere when replacing the overflow bottle... what i would do is run a 5 amp higher fuse NO MORE THEN 5 and if this blows then you have a bigger problem

Had my blower replaced last year, but my heat does not work. I can turn it up to 91 degrees and it is barely warm. Help please.

try the blower motor

Check for the busted fuse at the fusebox labelled
Fan. Hope this help.