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Would not be compressor, as it runs only with cooling. When switched to defrost, valves close/open to direct air to vents at bottom of windshield. I suspect something has fallen into one of these vents.
Squeal from a new belt/pulley isolates the problem to a loose belt. Rule of thumb: in the longest span of the belt (between pulleys), you should be able to deflect the belt by 3/8th inch by pressing on it. This is easier with a drivebelt installation/tightening tool kit - available in the loan-a-tool programs run by Advance Auto Parts and Autozone.
There is a very good chance the belt that drives the power steering pump,is slipping.When it slips,you loose the power steering effect and it makes it hard to turn.It will slip under load.i.e when turning.Check the fluid level and belt.Replace belt if need be.I think this will be the problem.The squeeling is the belt slipping.Hope this helps you
Change the fuel filters these clog up. Make sure none of the fuel injectors and spark plug wires are shorting out against hot parts. Check out the cost to replace the ignition switch, it is most likely your problem? Do you have any problems with the lights? Are any of the fuses blown out? How long does it take before it will start again? Does the computer show any codes? The hobby shop on base might be able to help you trouble shoot your problem, maybe you get lucky and someone there can help you. Does putting on the brake shut the motor off?