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pump noise

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Wow, thanks for all that red!

It is pushing glycol, the temp is 30-40F.  I would guess it is coming from the pump and not the motor, since it gets quiet when the nut on the pump is loosened.  I suppose it could be from the motor though.

Like I said, I need to take it apart and figure it out.  I'll let you know what I come up with.

Perhaps the impeller is contacting the housing?  When you loosen the nut it creates enough clearance for the impeller to turn freely... but that also allows air in.  Check the seals on the housing.  They may be worn and allow overtightening, moving the housing into the impeller's rotational path.

Maybe - I'll check that out too.


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