From the Duct Tape Guys
The choke on my 1983 AMC Eagle refuses to work when it’s colder than 35 degrees outside. Is there any way to fix this situation with duct tape?
Duct tape a heating pad to the engine temperature sensor and it won't know that it is less than 35 degrees out. In the absence of a heating pad you can substitute a little kitten (just kidding). – DTG