Hot air from defrost and cold air from center vents when turn on ac in 190-e 2.6 mercedes benz 1989' help please

Check the fuses, 1,18, and 19

Center vents only open for A/C or cold air. If you turn to full cold then the pod that controls that door has gone bad or the dial has it closed off.

Sounds like the Defrost selection is selected. Is any cold air coming out? if not check the charge on the A/C freon.

The vacuum pods are going out most likely, spendy fix. Go to crutchfield.com for radio solutions as they have MB wiring kits to bypass the fader for new stereos.

Try closing the windows, the AC on some Mercedes require all windows to be closed for the side vents to work.

center console unit has a vaccum leak.
do you hear the vaccum pump in the trunk cycling over and over?
take it to benz for service very very difficult to fix.

hello,good day,seems your recirculating pump need tobe check,ty

Hey, what setting is your A/C on Max AC? AC? Cycling air in vehicle or taking it from outside

The car icon on the right in this image is what I'm referring to when I say cycling air in vehicle.


Also, do you ever have cold air blowing? on any setting or any speed? if not, find your A/C fan, it is smaller the the engine cooling fan, sometimes there are 2 fans together. The AC fan should be located at the front of the vehicle and is usually electrically powered.

Also try to find your compressor, looks something like this:


is it running? is one pipe hot and one cold? (the pipes I am referring to are inlet and outlet pipes of the A/C compressor unit.)

Hope this helps, keep me posted

hello,good day,seems you have problem in your recirculating pump,check the electrical connection for good contact,or you can plug-up for testing purpose,ty

chances are a blend air servo motor is not operating and a door is stuck open which lets the hot air from the heater core out through the vents