Thanks again Jeff. That will give me some things to investigate. Weather man says this weekend temperatures will be alot nicer than the teens we've been dealing with so I will get some driveway time in.
I think I'm looking right into the "box" part of the reservoir when I remove the cap (no long filler neck) so I guess I should easily be able to see any turbulence in there,.
I can only say that the fluid looked quite brown when I checked it last Friday night.
Mike.