Hello. It seems that belt tensioner is either 'weak' or the serpentine belt is not turning 'true'. Also, if the harmonic balancer is NOT 'fully' seated on the crankshaft, the belt will turn not 'true'. Usually if the belt tensioner if not strong, it will make a 'squeaking' sound. Good luck and keep me informed; if you want to.
We have the same problem, the ground wire from the battery is too small of a gauge. Replace it and it should be fine, get a size up gauge or you can use the same but expect it to happen again within a year when it corrodes again. It's a common defect in this model.
If you're finding it difficult to service/repair your car, get one of those online manuals.
You will not have to wait for others to answer, or rely on mechanics and all.
www.reliable-store.com
My personal suggestion would be to go for these repair catalogs. I know this website www.reliable-store.com that i used to get manuals from, and they
have all models online.
I also brought for my 1989 BMW, such old model, they had it and it was very good manual. Go ahead, I bet.
Since you eliminated the relay and blower resistor as possible problems, the only thing left is an intermittent blower motor. Have had the problem before and when the motor was replaced, the problem was gone.
Check for broken B+ or ground wire inside the flex boot from the body to the driver door . Common problem on all make vehicles . Open the door a couple million times an they can break . Well , hope it's that , these systems are controlled by electronic control modules . Computer's inside your doors , your vehicle has the same set up as the vehicle in this video ,check it out .
Dodge Grand Caravan No Power Window No Power Locks CAN Trouble
Did you replace the alternator with a new or used alternator? The transmission is controlled by the alternator on pacifica's. Check your caytilatic converter for the humming noise..
Look closely at #6, probably bad connector or wiring to coil. Get it somewhere else a 'new engine' sounds like a real bad outcome under the circumstances.
look near throttle body for backpressure transducer and mechanical egr valve, bpt burns up if plugged causes exhaust leak.e g r will need replacing also.