I just finished replacing the TX (expansion) valve and receiver/dryer in my 87 190d. Evacuated it , held vacuum,then charged it up with good old R12. My Pushbutton control unit does not supply the proper ground signal to the Kilma relay so I installed a temporary switch in the ashtray which does the same thing. Result is the compressor runs as long as the engine is running and the switch is on, crude but effective. All engine compartment compressor safeties are functional. In my testing I found cruising down the freeway I was getting center outlet temps below 28-30 deg on the third fan speed. I wasn't sure if this was desireable or safe so I switched the fan to high and got 36-37 deg at the centre outlet. Is there a lower limit on safe operating temps for this type of system and if so what is it and why. Cheers Dan

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