Air conditioning not working effectively

Your valves r tapping could be low on oil. I had a slight tap in one of my cars the engine is still going strong thousands of miles later

Does it start off blowing cold then goes to room temperature, or was it cold and now any time you turn it on its room temperature

From Owner's Link:

Maintenance Minder B Scheduled Maintenance
Recommended service for your 2006 Honda Ridgeline:

Replace engine oil and oil filter
Rotate tires
Inspect front and rear brakes
Check parking brake adjustment
Inspect tie rod ends, steering gear box, and boots
Inspect suspension components
Inspect driveshaft boots
Inspect brake hoses and lines (including ABS)
Inspect all fluid levels and condition of fluids
Inspect exhaust system#
Inspect fuel lines and connections#

Adjust the valves during services A, B, 1, 2, or 3 if they are noisy.

Maintenance Minder 6 Scheduled Maintenance
Recommended service for your 2006 Honda Ridgeline:

Replace VTM-4 rear differential fluid: Driving in mountainous areas at very low vehicle speeds or trailer towing results in higher level of mechanical (shear) stress to fluid or frequently fully loaded. This requires differential fluid changes more frequently than recommended by the Maintenance Minder. If you regularly drive your vehicle under these conditions, have the differential fluid changed at 7,500 miles (12,000 km), then every 15,000 miles (24,000 km).

Change your cabin air filter. It works just like the filter in your home a/c. If its clogged it will restrict airflow.

See if the same air pressure happens with the heat on. Check your vents to see if any are closed.

2006 thru 2008 have a/c blower connection recall. Take it to Honda they will replace the wiring harness.

if you have your old filter still in there look at which way the arrow points on it. If not the leave the filter out and turn your air on. Feel with your hand which way the flow is going.That will tell you the flow.

replace the hepa filter located behind the gove box.

the tire pressure is low, and after driving a few miles it warms up, the air expands and the light goes off, when tires are cool, check and set all of your tire pressures to what is listed on the door decal. if the tire are hot take the decal and add 4psi

Hi there. When a compressor is replaced, two things are in fact being replaced - both the compressor and the refrigerant (Freon) and if the problem is resolved as a result which of those two replaced elements caused the original problem? Well you will never know and so before the compressor is replaced you need to have you’re A/C system recharged – it’s by far the most cost effective initial thing to do. In general A/C systems loose at least 10% of their effectiveness each year through loss of refrigerant and so given the age of your car; it’s the first thing to focus on. A professional A/C centre will also be able to tell you whether your compressor is working properly after having a refrigerant recharge by the monitoring the operating pressures in the A/C system.