guys there is a lot of discussion on this you need a new themistor. They cost about $5.
check these out http://www.peachparts.com/shopforum/showthread.php?threadid=14376&highlight=barrie+temp+sensor
http://www.peachparts.com/shopforum/showthread.php?threadid=7854&highlight=barrie+temp+sensor

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Martin Ingram
Colorado Springs
2005 320 CDI
2006.5 VW Jetta TDI
1991 560SEL (179000 Sold)
1972 280SEL 4.5 ('The Lead Sled' 320000 miles when sold.)
1972 220D (225000 when sold)