Quote:
Originally Posted by N41EF
The car is the manual climate control, doesn't have the digital display. I have read many threads about the evap temp sensor, is it something I can check with a meter? I'm guessing it's a temp/resistor, anyone know what it should read (besides open or shorted). Thanks again, Chuck
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The manual version of the W202 climate control system does not have the LCD panel and you can't read the actual values via the panel. The system does have diagnostic codes that can be retrieved via an MB scan tool.
I don't think the manual system uses vacuum pods to direct the airflow - I'm pretty sure it uses some sort of cam mechanism to directly move control flaps based on the position of the rotary selector switch on the front panel. When the panel is removed you have to line up a male/female nylon rod that transmits the movement of the control knob into the innards of the HVAC box - if the HVAC control head was removed at some point in the past its certainly possible the control rod was not properly reconnected. You should be able to feel some resistance as you move the air control rod through a 360 degree range. If you don't feel differing levels of resistance (and hear things moving around inside the dash) you need to remove the control panel and check the nylon rod to see if its correctly installed.
Test values for the evap temp sensor are
temp 10C -> 5.2-5.8k Ohm, 20C -> 3.2-3.6k ohm, 30C -> 2.0-2.3k ohm, 40C -> 1.1-1.25k ohm