BMW E32 heating and temperature control not working
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My E32 heater blows only hot air, what causes the fault?
The most common cause is a stuck water valve that lets too much hot water into the heater. The valve often sticks open because of limescale deposits, and you can try to free it by tapping it or oiling the shaft. If it does not free up, the valve is replaced.
Why does one side of the E32 blow warm air and the other cold?
It can be the water valve for that side, whose seals have oxidised or whose coil is broken. Another cause is a control motor that has come loose from the air flap or inside the air conditioning unit. The fault is found by taking off the air conditioning unit's panel and trying the motors by hand.
Why is there no warm air in the E32 front passenger footwell?
The footwell air flap's control motor may be stuck or broken, or the footwell vent is too high up. A clogged fresh-air filter weakens the airflow, so also check the filter and the air ducts.
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