Greetings Peter,

You can rest assured that you don't have a servo problem, cause you don't have a servo unit on your car unless it's an '80 The monovalve came out in '81 and everything since then is controlled by it, heat qty. wise that is. If you are getting no fan air movement at all I'd be checking the fan resistor to see if perhaps it has gone out, but first check the fuse to see if it has blown for you. In some previous owner cars they installed a 10 amp fuse in place of the 25 amp and it didn't last very long under a load. Your blower fuse should be red in color if it is the right one installed. Hard to imagine that all the resistors (4 in all) would have gone out in your resistor group that controls fan speeds. Even if the fuse looks good, replace it and post back your results.


Charles

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"Tell me and I will listen, Teach me and I will learn, Show me and I will accomplish, Involve me and I will succeed."
'84 300SD 256,000 Gold on Brown (Mileage Award)
'86 300E 246,000 Blue on Tan