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I have 2008 Dodge grand caravan sxt with a intermittent front blower motor problem,when the blower dont work we have no power on blue supply wire.Thank for any help

You're gonna have to help us out here a bit in order for help to come your way. What engine? What trim Caravan?

On a whim I pulled a diagram for a Caravan SE with a 3.8 engine. I don't see ANY plain blue wire in the cooling fan circuitry. There is a Dark Blue/ Violet wire. Where is this wire? Where are you testing? Does it fail on low speed or high speed?

I think the blower in question is the heater blower motor, correct? If so the blue wire is fed through the blower relay that is in the power distribution box. The blue is power and speeds are controlled by ground through the resistor.

Ooops, my bad. Somehow I had coolant fan on the brain.