Honda Repair Questions? Ask a Mechanic for Answers ASAP
The drain hoses sometimes get clogged with leaves and debris that makes it past the cabin air filter. Most of the time we can unclog these tubes by just blowing some air into them. The squealing noise should go away after that.
Also are you sure that the noise isn't coming from the rear ac fan? They have a separate drain tube that can also become clogged. Same fix.