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What is the ideal thread sealant to use on parts involved with the cooling system? Temp sensors, fittings, etc. My new temp sensor from Deere has white paste looking stuff already on it. But I'm also installing.g a block heater on the tractor and pickup. Plus a coolant filter on the truck as well.
 

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High Temp thread sealant

When I replaced my block heater, my JD dealer recommended the Locktite PST592 thread sealant. I was particularly impressed with the applicator on the tube. It was very well designed to get the sealant down into the threads with great uniformity. I also used it to seal the block plug that I removed to drain the block. No leaks.

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