Good call on the radiator fan clutch: the cardboard test will help with this.

My current car is E 70 with N 55 motor which is terribly efficient and when the temps drop very very slow to get to temp.

With ⅓the radiator blocked i have to turn off the cabin heat for at least ten minutes just to get to 75 C.

Today at -7C i never saw 90C with 30 min. of driving.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)