...
While we are on the subject of cold weather, one other "cooler" item comes to mind for the OP.
I have heard that heavy duty aftermarket transmission coolers sometimes work so well, that in severe cold weather the transmission does not reach proper operating temperature. The result is somewhat akin to the overly thick damaged oil that forms from overheating, in that the transmission may not shift properly. The fix was to bypass the cooler in cold weather, and some brands may have built-in bypasses.
In the distant past I have had very cold starts where the OEM-cooled auto tranny had that buzzing for a while, indicative of a hydraulic pump with an air bubble in it. The last ten years we used a manual transmission, or Prius, neither of which have that cold-related noise problem.
Wes
...
