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#1
09-21-2004, 12:42 AM
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No heat in 300SD
My 116 300SD is not currently blowing hot air. last year i replaced the servo with a used one, and this one isn't leaking, and i don't see why it shouldn't work. Is there a way to test the amp under the passenger-side of the dash? What about the push-button unit? All the correct vents work and the compressor comes on with defrost or A/C on. When I had the wheel to 85 degrees, it blew cold outside air through all the dash vents, so could this whole problem be related to the dash temp sensor? Please let me know of any suggestions you guys might have.
Thanks David
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_____________________________________________ 2000 Honda Accord V6 137k miles 1972 300SEL 4.5 98k miles _____________________________________________ 
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#2
09-21-2004, 01:27 AM
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Try turning it all the way up til the wheel clicks. This should select full heat, floor vents.
If you still get the wrong vents selected, it's the pushbutton unit for sure, otherwise, you need a new amplifier. Usually it gets toasted when the servo goes bad. Peter
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1972 220D ?? miles 1988 300E 200,012 1987 300D Turbo killed 9/25/07, 275,000 miles 1985 Volvo 740 GLE Turobodiesel 218,000 1972 280 SE 4.5 165, 000 - It runs!
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#3
09-21-2004, 09:34 AM
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The 116 doesn't have the click feature like the 124's and the 126's. It goes all the way up and all the way down, but doesn't click, unless mine's never worked correctly. The heat worked fine this moring to take my dad to work. (His 300E's getting the rear camber fixed and b/joints.)
Thanks David
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_____________________________________________ 2000 Honda Accord V6 137k miles 1972 300SEL 4.5 98k miles _____________________________________________
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#4
09-21-2004, 04:01 PM
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Quote:
Just because it isn't leaking doesn't mean it should work, the servo mechanism inside could be shot and burned out. Point of note, a frozen servo WILL smoke a amp assy, and a burned amp CAN smoke a new servo.
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Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
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