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lyle_H 12-01-2010 05:38 AM

defrost/blower issue
boys and girls,

circa 1987 420sel has issues....defrost comes on when it wants set temp....

also, in the morning, when cold, there is a blinking light /clicking noise from the air circulation switch on the acc(the one next to the defrost)...the blinking/clicking will take the blower off line

ideas please...cold in west texas


mbdoc 12-01-2010 09:10 AM

The system is signaling a short in the aux water pump, heater valve OR one of the sensors.

Try un-plugging the aux water pump or heater valve 1st.

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