Indeed. When I swapped in a new engine, my temps were really weird. Took awhile to figure it out, but the PO had cut out the guts of the thermostat. Putting in the proper thermostat solved the problems.

http://www.peachparts.com/shopforum/diesel-discussion/322553-engine-temperatures.html#post2991951

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Current Stable

• 380SL (diesel)
• Corvette C5
• Manx
• Baja Bug
• F350 Powerstroke
• Auburn Boattail Speedster replica

i have never even heard of this po system and will check that too

I haven't seen anyone note in this thread that the dash temp gauge should be checked for accuracy by comparing its reading to some other measuring tool ie IR thermometer. I do this after confirming that the temp isn't obviously so hot my engine is in immediate danger.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.

Check Post #6....

Tip for radiator lovers =>

Radiator Fin Tool | Frost Auto Restoration Techniques

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!