that shudder system is a joke so far we had 2 caddy's that had that system 1 ran fine with it and this one cant have it we had to use a socket to hold it permently open. the 1937 caddy we had was running to hot no matter if you were in winter or not. really nice car but need a ton of body work the guy who bought it owns the trucking company that ships all of walmarts goods with in the country.