Thread: M450 Webasto
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Old 02-01-2016
Doubledoc Doubledoc is offline
Senior Member
Join Date: Jul 2009
Location: Bend
Posts: 186

The fluid -antifreeze/water- is the same as the engine coolant. If the engine coolant is full (site glass visible when engine bay is open) so is the webasto system. The engine heat switch on the dash is just another way to start the webasto system.

Because the engine coolant is the same as the webasto system, one is heating the engine coolant so heat is lost to the engine bay. If it is very cold outside, one has a big heat loss thru the engine bay!

Something else I recently found is the diesel fuel filter location for the webasto unit. It is located inside the wheel well on the curbside at the front of the drive wheel well behind a small metal shield. It is hard to see but one it is there.

I had a lot of hose clamp leaks which took a while to find them all, but now our system is leak free.
Jim Colby
Bend, Oregon
'06 450LXI
"Dream Catcher"
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