Thanks gents. Great advice. Re pulling injectors, it wasn't to clean them. It was to clean the carbon around the glow plug and get an eye on the carbon build up from the inside. Maybe spray some pb blaster or carbon cleaner on the back side. Something that would evaporate by the time i'm done. But I don't want to blow engine up.

Sounds like first thing i need to do is change that thermostat

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What Would Rudolph Do?
1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius