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#1
11-15-2006, 10:07 PM
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Before I start...
....taking parts off my 73 450SL, words of wisdom would be welcomed from the venerable forum members. I have the old style heater control system, with two actuators on the starboard side of the firewall that operate the heater control valve. The heater controls will close the valve but won't open it. I open it by pushing on the rubber membrane thing, thus pushing the little rod that opens the valve itself. When I push either of the levers on the dash down, the valve closes. So, given that long monolog, do you think the guilty party is the valve control or a vacuum leak between the actuators and the valve control ( hoses and connections look good) or could the problem be with the actuators.
__________________
'73 450SL -104,000 '91 420SEL -127,000 
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#2
11-17-2006, 12:56 AM
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vacuum actuator
If you are talking about the vacuum actuator, check to see if there may be a small crack, tear, or hole in the black diaphragm. That will keep it from operating and opening or closing the fluid control valve. The actuator is easily removed and you can test it by blowing into the tubes where the vacuum lines connect to it.
__________________
Gary 1973 450SL 1999 Silverado 4X4 Ext Cab 1999 Mercury Sable 1972 450SL Parts car Previously owned keepers: 1967 MGCGT - 3L-6 1972 Mustang Fastback - 351C Current Cylinder Index: 37
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