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#1
04-01-2008, 04:49 PM
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Heater Servo Unit
I just had the heater servo unit replaced on my 1978 Mercedes 450sl due to coolant leak. Now the air conditioner is just blowing hot air. Mechanic said one has nothing to do with the other. He said there could be a vacuum line that wasn't tightened. Does that make sense? I really don't want to drive another 60 miles to have it checked out if the air conditioner problem is a seperate issue. Can someone please help me. Uninformed woman. THANKS.
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#2
04-02-2008, 09:55 AM
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Sounds like BS to me... Tell him to finish the job right! While it is certainly possible that your A/C crapped out at the exact same time for unrelated reasons, it is fairly unlikely and quite a coincidence!
It could be, however, that whatever flap/valve turns off your heat has been broken all this time and you never noticed it before because there was no heat in the first place. In other words, your A/C is in fact working, but your new heater is overpowering it. Either way, I'd think the mechanic ought to have fixed that. Standard disclaimer: If you have the electronic climate control from the era then all bets are off, there is some kind of newer replacement unit available for it though.
__________________
___ /<>/>/> 1967 230S automatic Boston, MA
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#3
04-02-2008, 07:37 PM
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Your mechanic is FOS. The servo is an integral part of the climate control system. If the AC worked with the old servo, you should not accept the repair if it doesn't work with the new one. Rebuilt servos can have problems.
__________________
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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#4
04-04-2008, 09:12 AM
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Always on heat
The flow of hot water is controlled by an electric valve which is part of the servo. If the heat isn't turning off then the valve is stuck or the amplifier is blown. You should have this checked right away. If the valve is stuck then the servo will draw power even when the car is off. This will drain the battery and eventually the car won't start.
You should take it back. You've already paid for the repair. You shouldn't have to pay for it again. It is quite possible that the replacement servo failed almost immediately. Whatever it is, it's not your fault. The repair tech should fess up and tell you what's really going on.
__________________
Steve S Support Tech UnwiredTools, LLC www.unwiredtools.com 1982 380SLC 1994 E320TE 1998 E300DT
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#5
04-04-2008, 09:36 AM
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Now before you guys get up a lynch mob perhaps you ought to find out more about the problem. We don't even know if the A/C worked BEFORE the servo replacement!
I'm not saying there isn't a vacuum line off or possibly a faulty servo but before you send her off to do battle with the wrench shouldn't you diagnose the condition?
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