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Re: liquid noises coming from the dash board
Heated water goes to your heater core under your dash..though you shouldnt be hearing it usually..be sure water level is up at radiator overflow reservoir and pay attention in cabin of any sweet smell of coolant indicating a failing /leaking heater core....look for damp carpet on passenger front area if suspicious
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If it doesn't turn to the Face/dash. Then you have some work ahead of you. The motor is turning(causing the knock sound) but the door in the plenum isn't. The gear is what's causing the noise. But I could be wrong. Older cars don't have this. Year make and model please.
your heater core is behind the dash on the passenger side. The antifreeze travels through it as its cycle through the engine. Thats what gives you hot air when you turn your heater on. If you find that there is water dripping or pooling in the floor board of the passenger side then your heater core needs to be replaced and its not an easy task.
Have BMW do the diagnosis. The noise you're hearing is the "re-circulate fan". It's supposed to run for up to a minute after you turn car off. It re-circulates oaf through front vents/cabin filter. Trust me, you do not want to "operate" on that dash.
The noise you are hearing is the blend door motor. It is a DC motor that moves a door in the heater box that controls the temperature of the air coming out of the box. There are two typical possiblities, one, the blend door motor is bad and two, the blend door is broken and the motor cannot move it.
Hello Ray. There could be two things causing this. First, and most likely, is a plugged drain for the heater evaporator case. If this drain is plugged, water can accumulate in the box and slosh around. In the engine compartment, on the firewall, usually on the passenger side, near the bottom there is a small tube sticking out. Run a pipe cleaner or a small wire up inside it and work it around until the debris is cleared. Secondly, your cooling system may be low on coolant. Air mixed in with the coolant circulates through the heater core creating noise. Check your coolant levels. If it's low, then you should check for leaks in the system. Thank you for using FixYa.
Re:- the buzzing behind the dash:- Its tiny a fan which carries on running in humid conditions to circulate the air so you dont get blasted by warm air when you use your climate control.It circulates air across the humidity sensor. It keeps running for a while after you switch off, and starts again when you open a door. It does this so that there is less delay in getting the climate control to the right setting when you switch on (or restart).