3000 getting hot

LTFT

Member
1968 3000, Replaced water temp. sending unit , lost about 3/4 gallon anti-freeze, filled back up with 50/50 after replace, and gauge running in the red. Washed radiator and still shows hot. Did not get OEM unit.
 
Well, It was at fast idle, Got up in red bigtime, 155 degrees on water sensor, what puzzled me was maybe 2 inches behind water pump on intake side was 185 degree and on that same side, the rest of it was 155. Think your right, sensor not calibrated to gauge. Thank you.
 
(quoted from post at 19:56:44 05/02/20) Well, It was at fast idle, Got up in red bigtime, 155 degrees on water sensor, what puzzled me was maybe 2 inches behind water pump on intake side was 185 degree and on that same side, the rest of it was 155. Think your right, sensor not calibrated to gauge. Thank you.

Sounds to me like your thermostat is sticking, and not opening correctly.
When I first got my 3000 diesel, my heat gauge never moved from the 'Red'. Turned the key switch on and the gauge went right to Hot, and stayed there.
Tested the thermostat in a pan of hot water.....was just barely opening.!!
Changed the thermostat, and heat sender.......TADA working fine now.!!!!

Gary
GB
 

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