[CP1]

It appears that the temperature sensor for the AC is behind a little grille between the temperature up buttons (automatic air). If there are not two separate temperature sensors, how can it adjust each side individually? If there are separate sensors for right and left, where are they?

Enquiring minds want to know.

 

[Woolly]

CP1 - 1/29/2005 7:37 PM

It appears that the temperature sensor for the AC is behind a little grille between the temperature up buttons (automatic air). If there are not two separate temperature sensors, how can it adjust each side individually? If there are separate sensors for right and left, where are they?

Enquiring minds want to know.

it doesnt really... you set your temp, your seat cover set's hers, if you are warm/cold you adjust yours, likewise she. the sensor you mention purely takes an average (between the two sides) and controls the temp from that.

 

[CP1]

Huh? It seems to me that you need two sensors to control two temperatures.

 

[Woolly]

CP1 - 1/29/2005 9:56 PM

Huh? It seems to me that you need two sensors to control two temperatures.

Yeh you would to control 2 temps - all the MB system does is maintain an average betweenthe L & RHS , It doesn't control the 2 sides seperately.

 

[CP1]

If it doesn't have two measuring points, what is the meaning of the temperature values that you dial in?

Are you saying that if one side dials in 75 (the I'm sooo cold person) and the other side dials in 65 (the I'm soooo hot person) that it's no different than both sides dialing in 70? Why bother?

 

[dbslk]

Whilst the temperatures cannot be maintained on either side of the cabin I thought the blowers do work independantly.

When my passenger has changed their temperature dramatically I thought their side blew air at them while mine remained calm.

 

[CP1]

dbslk - 1/31/2005 10:06 AM

Whilst the temperatures cannot be maintained on either side of the cabin I thought the blowers do work independantly.

When my passenger has changed their temperature dramatically I thought their side blew air at them while mine remained calm.

Fan speed does nothing for temperature. One would think that the system needs to change the hot/cool relationship on each of the sides.

 

[dbslk]

But surely if the car can control seperate hot/cold supplies to either side then you can blow different temperature air to that side?

 

[steve-p]

There's a single sensor in the cabin, but there are an additional pair of sensors measuring the temperature of the air which is being fed in. There's one for each side, and both sides operate independently.

 

[CP1]

steve-p - 1/31/2005 3:29 PM

There's a single sensor in the cabin, but there are an additional pair of sensors measuring the temperature of the air which is being fed in. There's one for each side, and both sides operate independently.

Do you think they are inside the plenum?

I just tried a little test. Had the system set at 70/70 and then changed to 75/65. Absolutely NOTHING changed. The air velocity or temperature out of the vents didn't change at all. I seriously question that there are additional sensors.

Where's a wiring diagram when you need one???

 

[steve-p]

There's a file from Mercedes-Benz called "287 HO 01 electrical & climate control (FAH) 10-05-04.pdf" which describes the whole system including the three temperature sensors. I can't remember where I downloaded it from though.

 

[CP1]

You are correct, sir. There ARE exchanger temperature sensors. Thanks. I forgot that I have all those PDF docs.