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When bypassing the servo, hot water will no longer be flowing to the bottom of the servo. Therefore, the temp controlled vacuum "switch", mounted on the bottom will never close (actually, the vacuum switch opens, turning on vacuum to the electric switch, which closes), and the fan will not run in heating position. A vacuum source must be applied to the switch, or an electrical bypass be affected to allow the fan to run. Now if your fan is FUBAR, you will get a bit of air thru the heater cor with forward motion of the car, if you open the recirculation vents to allow outside air in to the cabin...
Fixing the sevo is a $600 or so proposition, replacing with rebuilt. Unwired Tools has a digital option for roughly the same cost, and is purported to work wonderfully. ScottinSoCal on the "other" forum has reported his retrofit, with desirable results, and no more worry about the servoc taking a dump in 2-4 years...
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RM Smith
1988 560SL
"Where is it again that we are going, and why are we in this handbasket"?
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