help heater sucks

[mlovesj1020]

95 525i 170k miles .
well actually it blows but not very warm that is. nomatter what seettings i use the air coming out isn't more than luke warm, and the vents coming out of the rear of the center console allways blows ice cold. on warm days when i try to use my ac, the rear vent is ice cold but the front vents are slightly colder than cabin temp. ive taken out the ac and vent controlls and found that all the cables are connected and work fine, and the circut board for the ac switches are fine. not burnt or loose no dust. any ideas? thanks -john

[KBHumphrey]

First and easiest check is to pull the microfilter. If it's all clogged up, that could be preventing warm air from getting through. Beyond that you might be looking at the stepper flaps in the dash but hopefully it doesn't come to that.

[sfgearhead]

The air coming out of the rear vents is always cold, or rather external temp. That's just a duct for outside air. Close them in the winter if it's too cold.

As for your lack of warmth, definitely change your microfilter as that will greatly reduce airflow. After that, if it's still not warm, you're looking at likely a bad aux water pump or stepper motors, all the stuff up by the driver's shock tower. See the other thread on this subject.

[mlovesj1020]

replaced filter, old one wasn't that dirty though. still nothing. i guess ill try the pump and valves by the fuse box. thanks