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Environmental control temperamental


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My heater/ac works when it wants to. It gets cold or hot based on the setting but the fan comes and goes as it wants. I have replaced the resistor pack and tested the fan for operation with power directly applied. It works well. When I connect it to the environmental control it only works after you've driven for a while. When you stop it will quit and you have to drive for 15 to 30 minutes before it works again. My controller has the temp on it rather than the red and blue temp control. I have removed it and looked for dirt or obvious problems. Does anyone have any ideas where I should look or techniques to use to troubleshoot the circuit?

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