1999 Pontiac Grand Prix less heat

I started my vehicle and let it warm up for 40 minutes and when I got in I noticed it wasn't putting out as much heat as it did a few days ago. I checked the radiator hose's to see if they were warm and the top hose was warmer than the bottom hose also the hose's that run to the heater core were around the same temp. If you need to know the car sat for 2 days and it has been colder than it was a week ago. Another thing I noticed was the rad hose's had what seemed to be a lot of pressure built up in them, just wondering if this is normal or if there is some thing wrong here. If you need to know anything else just let me know.