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Re: Cooling problem
There is a dye you can out in your fuel that will show up in the coolant with a UV light if you have a leaking head gasket, cracked head, whatever the case may be. Another thing you can do is use a test kit to pressurize the system and see if it leaks down.
If you are heating up under load and not at idle that would make me think of air in the system and only drawing significant coolant while loaded with more rpm.
Dan
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Forgive my typos, big fingers and little Android digital keyboard....what a mess 
06 GMC Sierra crew cab Z71 DD leveling kit, 34's, bumper, LED lighting. Still doing stuff to it.
67 El Camino Custom 300 Deluxe. In progress.
55 GMC 371 2 1/2 ton. Upcoming project.
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