Whats wrong with the loop, its only a coil with a thermostat bolted to the bottom, usually the 2 O rings that hold the thermostat to the tubes perish and are easily replaceable from a generic O ring assortment pack.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)