Evil Servo bypass

[imagesinthewind]

My 78 300SD has no heat. A few years ago it didn't have heat and i took it in and had the amplifier replaced. That fixed it and had heat. Last winter my heat stopped, there was clicking behind the glove box, intermittently the heat wouldn't work and I figured the amp was going again, but never got around to replacing it. I spent all winter with no heat and cold defrost.

it getting cold and I want to get a part time job delivering pizza so I need heat this winter. I replaced the amo with a known working one and no heat. All the buttons work and blow air (cold) so I guess it's the evil servo this time. Or could it be the thermostat?

If it's the thermo, I can replace that pretty easily, if it's servo, I cannot afford to replace it so it will be bypass time. I did a search and there are many many threads on it, but I want the best one and hopefully one that give my feet heat as well as hot defrost.

I know that every winter this comes up, so please have pity and patience with me.

Thanks and glad to see all the familiar names still here!

Ginny