Thread: S63 Oil Check
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      02-23-2021, 10:39 PM   #3
arucano
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My .02 on the Aux Radiator.... If you can bypass it, then there should be no harm in test running the motor (after the above oil procedure). Radiators are meant to cool the coolant. You can monitor this digitally via the double secret
test mode and shutoff motor if need be.

L[/QUOTE]

There is a dry run protection on the circulation pump motor so you might not get a permissive to start. You will need to make sure the system if full of coolant and then "jumper" the cooler hydraulic circuit.
Try turning the engine over "by hand" (crank front bolt or bar over via starter ring) to se if it is seized.
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