Help! My coolant temp heats up fast in idle or slow-moving traffic (around 210F+) then decreases when I start driving (around 170F-190)

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Camar068

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Kentucky
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David
Truck Year
1986
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K10/LM7 5.3/4L60e/np208/3.73/32"
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10 yrs Air Force
Plenty of controllers out there if you don't want to build one. However you do it, I wouldn't T into the cooling hoses for the temp probe. I'd get one that goes into the head.
 

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