False alarm. Blower quit again. I thought it was a bad connection at the fuse because it started blowing again after I jiggled the fuse. But then it quit again. Plastic fuse showed evidence of melting at the end. Is a melting fuse indicative of a specific problem.
If you've got an hypothesis, throw it out. When it worked after I replaced the amp, it only blew once the engine warmed up enough to trigger the 'no blow until warm' switch. After reading the manual I now know it should have been blowing on defrost when cold but it wasn't. It was blowing on defrost when cold after jiggling the fuse this morning but quit again after my wife drove it away.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

For pictures of the disassembly of the motor in an attempt to replace the brushes, see this thread:

http://www.peachparts.com/shopforum/diesel-discussion/244338-replacing-brushes-116-blower-motor-post2100320.html?posted=1#post2100320

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

Intermittant #3 (sometimes $9) fues failure on a 116 is usually the fault of a shorted A/C low pressure switch on the drier.

If your system works fine on Heat, but blows the fuse(s) in the A/C & Defrost positions, unplug the low pressure switch and the trouble will cease about 90% of the time.

I have seen hundreds of servos replaced only to have the same problem.

FYI W116 fans...Robert

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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership