So, how did MB change it after 74? The AC system in my 76 is pretty basic.
I wouldn't have thought they would have changed anything much before
they went from the 115 to the 123 models?
Any ideas?
RB
On Sep 7, 2014, at 3:01 PM, Peter Frederick via Mercedes wrote:
Actually, there a simple but difficult to properly repair cause for blower failure in the
W114/115 -- the damper flap that switches from heat to AC has a change-over switch on it
that switches the fan control over between the AC blower and the heater blower. If this
servo (vacuum operated) leaks, or the switch fails -- very common, by the way -- the
switch-over can get stuck between the two positions with neither fan blowing. The servo
is long unavailable (not used since 1974) but you can "cheat" and simply wedge
the blower switch (and the damper) in the correct position manually.
Otherwise, it's the blower switch or the motor, and the motor is pure hell to
replace. On that car, you have to remove the evaporator.
Peter
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