NO HEATING hi i have a heating problem my car is 1998 318i bmw. My defroster doesn't seem to be blowning air but you can hear the fan working. Any help would be great cheers

Hi there,

Page 104 of the user manual articulates the climate controls functions of the vehicle. Defrosters are identified as buttons 16 (front) and 15 (rear). Temperature control with buttons (6) down and 8 (up).


All Docs BMW 7 Series Owner Manuals

sounds like blower bearings are dried out and will eventually lock up the blower..sometimes you can spray wd40 in the blower bearings and it will work fine for a while.. also check vacuum controls to the baffle dors in the ductwork..may have some leaks there.. should hear a slight hissing if really bad..repost findings

it is your blend door motor

Don't worry I'm sure you will get the solution of your problem, just check the link I attached
Bmw e46

Sounds like the blower motor 4 the climate control system may have gone out

Fan motor is not working.

Either head gasket or air in the cooling system or the aux electic fan is not coming on.

Hi, Sounds like you have tried about everything. Ok the aux. coolant switch is for the electric pump for the heater core will not cause an over heating condition just a longer warm up of the heater core. Has the cooling system been bleed properly if there is a trapped air pocket it will not let coolant circulate. Was the new thermostat installed correctly? They have a vent that needs to be towards the top or they trap air on the back side and cant take an accurate reading to open and close. Other areas to look at would be proper operation of the fan clutch, if they fail they can cause the fan to not lock up properly and supply enough air movement through the radiator. The aux. electric fans and their temp switches do you hear them coming on are they coming on at the right temp.

check your hoses see if when runnig they close up,if not loo for vents for letting are out of the system if ther is a air pocket inyour coolant system it willcause the engine to overheat make sure to run the heat when refilling coolant system. if this fails to solve your problem look for a gurgling sound coming from the rad or over flow tank look for this when engine is cold and runnig if you do hear this then you might have a blown head gasket.you can buy a blown headgasket detection kit from your local auto parts store if you do hear or see this symtom.

you might check to see if theres air coming out at the floor level or the windshield level..if so you have a stuck regulator for the air control