my a/c started blowing hot, and at first i thought it was the compressor but i got out and looked and felt the compressor and it is still very cold. On my marquis it has a cold and hot button and normally when i press the cold (blue) button, the spot that reads the temp say 60degrees but now when i press it it says 75 and fells like heater air. Has anyone else had this problem and if so what should i do to fix it?

 

must be a newer model. It's probably the blend door actuator. The newer models use an electric actuator and a plastic door. either the door is stuck, the link to the actuator is broke, or the hinge on the door is broken. (or something is loose and needs to be plugged back in)

If yours has the electric actuator, check out these sites:
http://www.blenddoorfix.netfirms.com/
http://www.conceptualedge.com/blend-door/

If the system uses vacuum actuators, you may have a leak in the system or a bad blend door actuator. or stuff is stuck/broken