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mikebulriss · 04-13-2017, 18:23

As weird as it sounds, you need the front AC toggle switch on the small control panel on left side of the driver station to be switched to "on" for that front electric heater to come on. I know, counter intuitive, but that's the way they wired them, shut your front AC off at its themostat. Then as well of course, you then need the right side switch below the thermostat to heat side and then the thermostat switch on the bottom left to be turned to on. Then slide the temp setting to something above ambient temp and it should turn on.

And there may be a breaker in the electric box in the back also for the front heater also. Can't remember from the 91 right now.