I am guessing it is the monvalve coil, one poster repair his by finding that one of the coil wires had broken.

To check if the coil is working, ground to the engine the pin on the monovalve that you saw did NOT have the voltage, then connect lead. This should cause the monovalve to close and allow you continued summer coolness.

If valve is working, witht he pusbutton on EC, move the temp control to MIN, the vlave should be closed. The push button contols closes the circuit to ground. Moving the temp controller off MIN, the grounding will be still trhough the push button controller but is controlled by the "temperature controller" located behind the glove compartment. Setting the temp control to MAX leaves the circuti fully open.

Note, the Haynes manual says that you must rem,ove the centrol console to access the push button control. It is suffecient to remove the radio, then pry off the wooden panelling ....

Michael

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82 300TD Turbodiesal +250, 000
86 Volvo 740 GLE 220000
85 Honda Civic 120000