I have a 2000 Nissan Frontier XE King Cab. I'm new to Nissan Frontiers so I don't know much about them. The truck is used but in real good condition. The problems is - the air conditioner and heater blow well. The air conditioner blows 'cool' air - not cold. The heater blows 'warm' air - not hot. Can someone tell me what I should check and how?

The other problem I have is - how do I replace the lights behind the A/C switch. There are two switches one for circulation and one for air conditioning. The light behind the air conditioning switch is out. How do I replace it?