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#1
10-15-2008, 07:16 PM
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350 SL Heater control
My heater is running hot the whole time, no too much of an issue at the moment, but I'd like control back!!! I have attached a picture of the engine compartment and have identified a possible cause - but I don't know what the parts are called!! - it seems as if a piece of plastic has broken, any help and advice would be much appreciated
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#2
10-15-2008, 10:11 PM
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You need a heater control valve. The replacement unit is one piece with a built-in vacuum unit. Dealers and the online places all sell them.
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Chuck Taylor Falls Church VA '66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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#3
10-16-2008, 09:02 AM
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chuck is correct, you can manually turn off your heat by disconneting the vacuum push rod and moving lever to off position
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Ron 2015 Porsche Cayman - Elizabeth 2011 Porsche Cayman - Bond,James Bond Sadly MERCEDESLESS - ALways LOOKING ! 99 E320 THE Queen Mary - SOLD 62 220b - Dolly - Finally my Finny! Sadly SOLD 72 450SL, Pearl-SOLD  16 F350 6.7 Diesel -THOR 19 BMW X5 - Heaven on Wheels 14 38HP John Deere 3038E Tractor -Mean Green 84 300SD, Benjamin -SOLD 71 220 - W115-Libby ( my first love) -SOLD 73 280 - W114 "Organspende" Rest in Peace 81 380 SL - Rest in Peace
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#4
10-17-2008, 07:58 PM
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Hello,
Yes, the heater always defaults to the heat position for safety so that the defroster is always available. You will have to disconnect the vacuum and wire the valve closed so the spring does not keep it on.
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Joe Alexander Blacklick, Ohio 1964 220SE Rally (La Carrera Panamericana someday) 1966 Unimog 404s (Swedish Army) 1969 300SEL 6.3 (sold) 1969 280SL Pagoda 1973 280SEL 4.5 1974 450SLC FIA Rally car (standard trans) 1982 300D turbo (winter driver) 1986 560SEC 1989 Unimog FLU419 (US Army) 1991 300TE (wife) 2002 SLK 32 AMG (350 hp)
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#5
10-18-2008, 10:49 AM
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Quote:
Looks like it has mechanical fuel injection - Is it a euro spec car? North American 350SLs had EFI (electronic fuel injection) Answers by others above should hopefully solve your heater problem.
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Graham 85 300D  ,72 350SL, 98 E320, Outback 2.5
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Linear Mode
