BMW E60 Webasto runs but no heat reaches the cabin
Why does the E60 Webasto run but the cabin does not warm up?
A common cause is the Webasto's own circulation pump, which is broken and cannot get the coolant circulating. The coolant then overheats and the Webasto shuts off after about three minutes. Fault codes may not appear. The pump is behind the left front wheel, under the inner wing, in the frame rail.
Which circulation pump fits the Webasto?
The codes of the original pump are 86541B and the newer 1320443A. An equivalent pump is the Pierburg 702073130. The Bühler and Pierburg covers are not interchangeable, and the cover's seal groove can differ, so check the fit before installing.
What if the heat does not reach the driver's side with an aftermarket Webasto?
In an aftermarket Webasto the pump may be connected to the hoses the wrong way round. Turning the pump 180 degrees has fixed the heating. If only the driver's footwell is cold, the cause can also be a clogged heater core.