Heat repair
 

It's amazing.<p>I buy a Chilton manual for my Mercedes 300D and it gathers dust.<p>I lost heat the other day. I went to the manual, nothing. I did the usual, flushed the system, check the thermastat, etc. Nothing, still blowing cold. <p>I search "Mercedesshop" and bingo everyone refers to the diapharm at the heat valve. Disconnect the electrical connector and alas it turns warm, we're getting "warmer".<p>I order and replaced the diaphram in about ten minutes and it's blowing hotter than hot.<p>What am I getting at, just a thank you to all the members that contribute and make this a very useful site.<p>The above was so simple why wouldn't it be in a Chilton manual?<p>Thanks again

Exactly, which part was bad??
My '80 300D has a "heat control unit", $$$$, that is cracked, corroded, clogged and condemned. The PO installed a regular plumbing shut-off valve, which is not so good(a PITA).
A new unit, I think, is available for $700