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There were several postings last winter about not enough heat in 320/360's.  Someone mentioned that it was common that builders were connecting the heat scat tubing to the wrong connection point on the heat diverter valve.  While I live in a rather hot climate there were a couple of high altitude flights I made last winter that could of used a little more heat.  While poking around with the cowl off one day I noticed that the builder of my 320 did in fact connect it wrong - so I corrected it.  Well, now I can roast turkeys in there!  In fact, I had to put a cover plate over the inlet to the heat system this summer because the leakage in my 10 year old diverted valve was enough to make it very uncomfortable.

Anyway, I suggest you take a second look at how your tubing is connected because it does make a difference.  If connected per my very crude diagram below, you can get from 0 to 100% of the heated air.  If connected any other way, you will get heated air mixed with free air in the cowling area.

  ||
  ||   |---------|
  ||   |         |<---- Connect heat scat tubing here
  ||   |         |
--||----         --------
| ||   heat             |
| ||     diverter       |<-- Don't connect anything here
| ||        valve       |
--||---------------------
  ||
  ||<---- Engine side of fire wall
  ||


 R. Dan Ribb
 N320LC & L2K @ 20%

LML website:   http://www.olsusa.com/mkaye/maillist.html
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Please send your photos and drawings to marvkaye@olsusa.com.