David, 

I had to go through 3 in an Isuzu trooper once before it ran in the
proper temperature.
DON"T RULE OUT MFG. QUALITY CONTROL ISSUES.

It's a cheap part, but a PITA procedure on some cars to keep redoing.

If you want to only go there once, get a OEM dealer part, not one from
your FLAPS.

Just my $.02 of past experience.

Dan 

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From:    David M <>
Subject: 

I went on the first extended test drive today after
replacing my thermostat. The temperature gauge still
does not move above the lowest thick bar. If anything,
it's worse than it was before. Is it possible the
replacement thermostat was bad (it was a brand new
Behr)? Or, is it possible there is some other problem?
The van drives well and puts out lots of heat from the
vents. The fan is not running. I hate to think I'm
damaging the engine.

David ('87 Wolfsburg 2.1 auto)