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Unfortunately (or fortunately for me) the radiator fans in mine have been fine, so I haven't explored them much.

If the cooling system was opened, it might need to have the air bled out. I can see if that were the case, you might have a hot motor, but since the coolant isn't really circulating, it could fail to trip the sensor? The expanding air could cause the burping.

Just in case @jwight warning isn't enough, the intake manifold is plastic.

Here's what they look like it they overheat....
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