does not work: climate fan for vent or heat; a/c won't engage

[tucsonjwt]

We had a related thread here recently which started with a blower resistor question, so you might look at that.

My similar issue was due to no power to the controls, which was all because of a bad power harness at the heater control. I would remove the heater control and start wiggling the harness connector while operating the controls and see if it makes any difference. You can check for power at the harness using a 12 volt continuity tester and see if your heater control is the problem or if power supply is your problem.

You will likely have to remove the dash pad to get at the harness, unless you are a very small and agile person.