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#1
02-21-2006, 02:01 PM
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76 450SEL Heater control problem
The climate control system is working well, but I am getting cold air instead of warm air -- with the heat dial turned all the way to the red zone. What would be the correction for this situation? Must be something in the controls area that is not registering the heater setting ?? What do you suggest
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Ben Harrison Carter 1999 Mercedes ML320 87K 1992 Mercedes 300CE 89K 1995 Corvette 29K -- Sold Dec 09 1989 Mercedes 420SEL 99K -- (Sold 4/08) 1968 Mercedes 230S (106K) (Sold 9/06)) 1976 Mercedes 450SEL 130K (Just sold - 06) 1961 Mercedes 220Sb (sold years ago) 
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#2
02-21-2006, 04:15 PM
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I believe you have your answer in the vintage forum post...
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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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#3
02-21-2006, 04:21 PM
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76 450SEL heater
I sent Col. Klink a private message re that and I really don't think it is the control unit itself, but rather a vac connection or electrical connection that can affect what the servo does .... I have to check all those and think the answer may lie there .... Ben Carter
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Ben Harrison Carter 1999 Mercedes ML320 87K 1992 Mercedes 300CE 89K 1995 Corvette 29K -- Sold Dec 09 1989 Mercedes 420SEL 99K -- (Sold 4/08) 1968 Mercedes 230S (106K) (Sold 9/06)) 1976 Mercedes 450SEL 130K (Just sold - 06) 1961 Mercedes 220Sb (sold years ago)
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#4
02-21-2006, 05:45 PM
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Does the center air vent drop out when you change from cool to hot setting? One needs to evaluate if the system is moving and that is one good way. If the air is there in the low temp position and goes away in the high temp position, be sure you have the comp switch off. If you still have no heat then there is an adjustment on the temp wheel to get more movement out of the servo but if its gone as far as its going the servo is a common prob.
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Steve Brotherton Continental Imports Gainesville FL Bosch Master, ASE Master, L1 33 years MB technician
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#5
02-22-2006, 08:41 AM
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450 Sel
Thanks for the tips; will be checking the whole system out this week and hopefully will find the control problem, either in the dash buttons or wheel or in another area of the elec/vac systems. Ben Carter
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Ben Harrison Carter 1999 Mercedes ML320 87K 1992 Mercedes 300CE 89K 1995 Corvette 29K -- Sold Dec 09 1989 Mercedes 420SEL 99K -- (Sold 4/08) 1968 Mercedes 230S (106K) (Sold 9/06)) 1976 Mercedes 450SEL 130K (Just sold - 06) 1961 Mercedes 220Sb (sold years ago)
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