It's there for a reason, and helps in any climate, tho' obviously more important in Duluth. First, make sure your thermostatic spring is still intact. I was lucky enough to get Max Merritt's last new one in the early '90s, but perhaps he or another Packard vendor has some NOS by now. Barring that, you might match yours with a carburetor choke spring at any long-established, serious auto supply house.
I inveigled John Kepich to produce the bimetallic manifold heat valve thermostatic spring's cover in stainless steel, since the factory's mild steel cover is often rusted away.
Kepich Exhaust, Mocksville, NC: (336) 492-5629
oldcarexhaust@gmail.com Grease the damper valve both ends with graphite powder which you can work in with kerosene, etc. Adjust it according to the Packard Shop Manual and you'll be good "for the duration."
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