I must have bad luck with water pumps, as it went out on my Dodge Intrepid, Nissan Quest, Ford Explorer, and my Mercedes.
They all went out with no warning. Not even a sound like a bearing is going out.
They just started leaking.
I don't think the cold has anything to do with it. Just age.
When I did mine, I replaced:
Bearing bracket - $138.00
Belt Pully - $34.00
Belt - $42.00
Water Pump - $228.00
T-stat - $28.00
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".