Use a straight edge or laser alignment tool to ensure pulley alignment is parallel. Check that all mounting brackets, pulleys, tensioners and idler wheels are secured tightly to the engine.

I bought a replacement idler tire from eBay for $6.50. It fixed the problem, tape deck works perfectly now.

According to Ford, the noise is most obvious on cold start-up in temperatures below 40°F, usually stops after about 10 minutes of driving and is due to grooves forming in the nylon belt idler pulley.

A squealing noise is indicative of a problem, but might not require replacement of the belt. Misaligned pulleys or a seized tensioner or idler pulley can generate some noise as well.

According to Ford Motor Co., the noise is most obvious on cold start-up in temperatures below 40º F, usually stops after about 10 minutes of driving, and is due to grooves forming in the nylon belt ...

TOM Another possibility is a bad idler pulley or tensioner pulley. Those are sort of "dummy" pulleys that are used to alter the direction of the belt.