Replacing your A/C belt or tensioner bearing.
Although the vehicle used in this case is an CRX SiR, the process is the same for a wide variety of Hondas.
As the car here is a JDM SiR, we will remove the power steering pump to gain a little more access to the A/C components. Also, as the power steering belt is the first on the pulley you will have to remove the belt first anyway so it's sensible to replace it at the same time.
You can now gain easy access the A/C pulley setup. Wind back the 10mm tensioner nut and loosen the 14mm pulley nut which will allow you to remove the belt. If you are not removing the tensioner, then you need only crack the pulley nut to allow the tensioner to drop.
Refitting is the reverse of removal. Be careful not to apply too much tension to either of the belts.
A close-up of the code numbers on the tensioner bearing. To save money you many be able to purchase a new bearing and press the old one out as an alternative to buying the assembly complete from Honda.