PeachParts Mercedes-Benz Forum - View Single Post - W123 No Heater/No Blower. Where to start?

whunter · #14 03-26-2013, 01:30 PM

Quote:

Originally Posted by Everybodyghost

That might be the best quick fix until I can get to that parts car.

Am I correct in assuming, that because I'm getting hot air, that the mono valve and aux water pump are functioning properly? Sorry, I'm having some trouble really understanding exactly how this system works, what it needs to function at all, and what can be removed for less luxury, but more heat. haha. Every car I've owned has just had a bunch of cables.

The heater pump generally has few issues, put a 2 amp fuse in the pump ground and ignore it.

There is no isolated mono valve on the evil servo system.

The large black box, in the engine compartment contains the plumbers nightmare.

This box has water valving, electrical switching, and vacuum switching.

It is famous for developing cracks/leaks inside the box = soaking electrical and vacuum with hot liquid or STEAM antifreeze = more damage.

There is a digital replacement option, basically the same price as a rebuilt Servo, but it has better durability/fewer problems.

If you plan to fully learn how it functions, I hope you have at least a few weeks free time for reading.

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