Yesterday I installed 2 digtal stats that I got for Christmas in our Challenger. Coleman Mach is direct replacement. The thermostat controlling the heat uses all the wires, the other one doesn't use one wire. Most of the wires are the same colors, 2 were different. (white to blue, red to purple) .. Just switch one by one to the new stat.. Couldn't be any easier to do. As mentioned, the mounting holes are even the same. Took about 20 minutes to change both. Highly recommend.
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