Webasto 12V Circulation Pump

[ken&ellen]

Tom, Parliment has a 12V Webasto pump on the self $206. according to their website. Ken & Ellen

[truk4u]

Paul - Message received... MP Pumps makes these for Webasto, so I'm good with the hot water.

Ken - Most likely the Parliament pump is 1 1/2" inlet/outlet.

[truk4u]

Finally got my circulation pump changed out and thought I would share my findings. The plastic impeller in the old pump had broken off and the pump was struggling to turn taking high amps to run.

The whole job cost about 250.00 bucks... The new pump manufacturer is MP Pumps. They make pumps for Webasto. The Distributor I bought from was Ohio Transfer & Pump. This pump has 1 1/8" inlet/outlet and if you buy the pump from Webasto (U-4814 or U4816) for the 2020 heater, the inlet/outlet is 1 1/2". So make sure you know what your pump inlet/outlet size is before buying.

Here's the website for the pump:http://www.mppumps.com/non-html/cata..._schoolbus.pdf


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New pump pulls 2.7 amps

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Old pump pulled 16.4 amps trying to run

NOTE - Be careful to not reverse the wires from the Webasto to the circulation pump. Black = + and Brown = -.

[Coloradobus]

Ohhhhh!!! Ouch!!!! Wish I had known this a week and 1/2 ago. Went out to Aquahot and bought a new pump for $500.00. I asked why so much and Lonnie of Aquahot said this is what Webasto sends them Hmmm, I feel ripped off! I know they need to make a few bucks, but reeeaalllyy!

[gmcbuffalo]

Tom
Looking at your old thread here with the last Pic of the broken impeller, did you figure out why it broke? These are centrifulgical pumps and work by creating a center low pressure and high periphial pressure hence the loaction of the inlets and outlets. You can block the inlet or outlet and these pumps and they will not break anything like a positived displacement pump will.

[gmcbuffalo]

Tom is this pump in addition to the Webasto pump in the Webasto housing? The only other additional pump that I have is the Prevost pump in the ceiling of the first bay that is operated a water pump switch on the dash with the heat controls.

[Jon Wehrenberg]

Every converter appears to address Webasto coolant circulation in a different manner so I am not sure anyone can generalize about pumps, their location or even their types.

[truk4u]

Greg,

I don't know what broke the plastic impeller, but my guess is the pump just got too hard to turn and the motor kept cranking breaking the shaft. The motor was also at it's end of life. This may have been the original equipment from 94.

This pump on my Liberty is mounted on the opposite side of the engine compartment from the Webasto. Like Jon said, there are many different configurations by the Converters.