2002 Acura RSX Heater problem

check fuse and relay under hood then have it scanned the control may be bad.

9 times out of 10 the blower motor will go out here is how to test the blower and and how to replace it with the location as well.

https://www.2carpros.com/articles/how-to-test-an-automotive-hvac-system-blower-fan-motor-a-detailed

Check out the images (below). Please let us know what happens.