[don terpening]

I hear a clicking noise inside my 92 190e under the glove box can anyone tell me what to look for maybe a relay or something ??

 

[doomrt]

I think it's the climate control vacuum...anyone can confirm?

 

[don terpening]

Thank's i will check it out

 

[93sportline]

Let me know what you find out. Mine does the same thing when it is cool outside. Dave

 

[Sincity]

Mine clicks during startup and when changing temperatures. It is the switchover valves for the Tempmatic system. I bought a new unit and it is on my "To Do" list. Hopefully it will solve my occassional hot air coming out of the side vents during AC usage.

 

[chowbow]

Same thing on mine. It recently started making that noise, and usually when the thermostat is in the 70-75 range and the car switches between slightly warm to slightly cool air. When it's hot out and I have the A/C on and the thermostat is low, it won't make that noise. It's one of those things I have to get to, but I'm a pretty big dummy when it comes to climate control related items.

 

[MTI]

If the "clicking noise" is a constant chirp, then it is likely to be the aspirator motor/fan. As the motor ages, the bushing inside the 12v motor start to bind and emit a chirping noise, sort of a smaller version of the noise that older blower motors make.

Located behind the glove box, the small electric motor driven fan creates an air current via a tube that runs up the the nearby A-pillar that terminates near the climate control's temp sensor mounted up between the visors. The air current is used to get an accurate reading of the temp inside the cabin.