As the blower motor is working the first items to check will be the two fuses in the system that provide power to the control head.
Quick way to test fuses AND verify that there is actually power at them is to use a test light.
https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester Connect it to a good ground and just touch the small tabs on each side of the fuse to see if there is power on both sides. Power on one side only = blown fuse.
There is a 10amp HTR fuse in the panel at the left end of the dash and a 10amp ECM-B fuse in there as well. Test both of those.
If both test OK then it is most likely a bad control head. That is because failure of one of the temperature sensors won't shut the system completely off.
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Friday, December 8th, 2017 AT 3:19 PM