98 Honda Accord AC Whining

Have you checked the cabin filter lately ? Possible low air flow perhaps ? Is the whining noise coming from under the hood or in the area behind the glove box where the evap. coil and blower are located ?

AC work is really not for the DIY especially in a situation like yours as it probably involves checking the pressures to verify system operation and from there it could be anything but you don’t just throw parts at an AC problem it’s really not practical.

That said I would start by checking the cooling fan operation as if one or both of the cooling fans are not working when the AC is on this could be the cause of the problem and that would be a relatively easy fix.

I know this is an old topi, but did anyone ever find out what was making the whining noise? My son’s 1997 Honda Civic EX is making a whining noise when the A/C is on and it is coming from behind the glove box.
I’m thinking it might be the expansion valve restricting the refrigerant, but don’t know for sure. All of the A/C components were replaced before this happened minus the A/C refrigerant lines. I wonder if a flush was ever done on the vehicle. Do expansion valves typically make a whining noise when they are starting to fail?
Any help will be appreciated.

Thanks!