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#1
08-23-2008, 12:24 AM
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Replaced Servo - Now I have no heat
I have had a leaking Servo unit for several months and just got around to replacing it today with an aluminum one (used) - went well, easy install. But, now I have no heat in any settings, including Defrost - A/C works fine. It was 90 degrees here today, but I couldn't get any heat.
Any suggestions - or troubleshooting tips? Never had a problem with heat before this... ryan
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RG Newell 1984 300D 1972 250 1986 560SL 1991 300CE 
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#2
08-23-2008, 12:31 AM
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did you completely bleed out ALL air from the cooling system? they are VERY hard to get all the air out. you need to park the car with it's nose up as high as possible, and open the upper radiator hose, and pour all the coolant in through the hose, until coolant exits the upper radiator fitting. then attach the hose and finish the fill.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 560SL convertible 1987 190D 2.5-5SPEED!!!  1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#3
08-23-2008, 02:03 AM
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if i remember correctly the vacuum lines on the bottom of the unit go on one way only, if they are reverese you will not get heat. this is a cold lockout feature that will not allow to operate until the car is up to temp
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1967 250 S 1967 280SE 1968 250S 1971 280 SE 1973 220 1974 280 S 1975 450 SEL 1976 220 D 1979 300SD 1983 300 SD 1985 230 TE euro 1986 280SL 1986 500 SEL euro 1986 190E 2.3 1990 300 SE 2003 C230 K 2004 C230 K 1987 560SEL 1987 300SDL now in canada 2005 C230 1998 C43 AMG Sold to DON 1993 190E 2.6 300TD Former daily driver Totaled current: R320 CDI Ram 2500 Cummins
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#4
08-23-2008, 08:51 PM
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I just tried to add coolant and the upper hose is full - I don't think I have air pockets as car seems to be warming up as it should...
The hoses on bottom are hooked up just as they were before... Any other ideas? ryan
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RG Newell 1984 300D 1972 250 1986 560SL 1991 300CE
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#5
08-23-2008, 09:36 PM
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possibly a bad amp? or the servo you bought may have failed, the aluminum ones also can have issues. after cycling the heat on and then turning the car off, do you hear the servo return to the park position?
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1967 250 S 1967 280SE 1968 250S 1971 280 SE 1973 220 1974 280 S 1975 450 SEL 1976 220 D 1979 300SD 1983 300 SD 1985 230 TE euro 1986 280SL 1986 500 SEL euro 1986 190E 2.3 1990 300 SE 2003 C230 K 2004 C230 K 1987 560SEL 1987 300SDL now in canada 2005 C230 1998 C43 AMG Sold to DON 1993 190E 2.6 300TD Former daily driver Totaled current: R320 CDI Ram 2500 Cummins
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