Thread: Is my Temp Gauge Accurate? Stubborn High Temps!
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Old 06-14-2025, 07:45 PM
Frank Reiner Frank Reiner is offline
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Join Date: Feb 2011
Location: Modesto CA
Posts: 4,309
Quote:
Originally Posted by JacksonKotch View Post
Hi All!

I have recently purchased a 1985 300TD (222K mi.) that seems to have the common semi-kinda-sorta-overheat problem. The engine temperature generally settles around 95C-100C per the dash gauge. I blasted the parts cannon since I wasn't sure of some of the cooling system history, and the gauge reading didn't budge an inch. I've reviewed a ton of threads regarding this issue, but I'm looking for a sanity check before I continue troubleshooting...

Do you folks think this temp gauge reading is accurate vs what I'm measuring with my IR thermometer? See below for photos of the measurements.

Here are the parts I've replaced thus far:
  • Radiator (Nissen)
  • Water Pump (Kent Special)
  • Thermostat (P.O. replaced <500mi ago)
  • Sender (P.O. replaced <500mi ago)
  • Pressure Cap
  • Coolant (Green stuff replaced with Zerex G05)
Before digging further into the engine components, give a thought to confirming that flow thru the new radiator is what it should be.
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