4630 coolant

MHG

Member
Hi guys. Checking fluids before starting after a long layover found a thick rusty sludge in the top of the radiator. Engine oil was not contaminated. Tractor has always had coolant conditioner. Because I was in a hurry didn't have time to check anything else. Any guesses on what is wrong or where to start diagnosis? Thanks in advance MHG
 

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