I have a school auto shop trying to fix the heater in my chrysler pacifica heater . The blower motor wont work on any speed they checked the power and sais everything seemed to have power going to everything do u have any other ideas they can try? I will gladly tell them because its a head ache

You need to specify if the car has Auto Temp Control or Manual......this is Manual. .Power is great, but its not going to work unless it also has ground. The black wire at the motor is ground, then it goes to the blower speed resistor, If you ground the Black wire, and the blower runs, the motor is OK, If you ground the Dark Blue /Gray wire it should work full speed. If it does not, then replace the resistor. The a/c controller grounds the Resistor. so if you ground the DB/GR wire and it works, then the controller may be bad. These guys should have access to a wiring diagram.