Re: [Chrysler300] Heater A/C control question

[Bob Jasinski <rpjasin@xxxx>]

Mike,

I'm a Chrysler guy but have also owned a number of older Mercedes with the servo device you are describing. 

I can tell you from experience that the only way to restore operation is to replace the servo. Having said that, here is some good advice.

Don't buy a new servo. The cost is high, close to $400.00, and if you plan on keeping the car awhile it will crack again.

There is a man named George Murphy at Performance Analysis Co. Oak Ridge Tenn. 865-482-9175, that specializes in rebuilding the servos and also offers a rebuit unit with an aluminum body that is crackproof. George knows these things well and is very helpful on the phone. His least expensive unit is a rebuilt OEM type for $249.00 and you get core value for your old one. When he rebuilds them he also enhances the original design by some tricks he has developed to make them more reliable. If the car is worth preserving, go with the rebuilt aluminum body unit which should last the life of the car, it's about $75.00 more.

The system works well once it is fixed right. Caution, there are some other small companies out there that are "rebuilding" the units also. Don't buy from them, they don't know what they are doing and they have a high failuure rate. I tried to save a buck and bought a cheaper rebuilt unit, went through three of them and not a good one in the bunch. 

Fix it right the first time and you will be happy in the long run.

Bob J






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