Hey fellas I noticed my heat isn't working in fact it blows like warm instead of hot air now ill shut the blower on 1 but leave the climate control on heat and I feel hot air coming out of the vents ill put the blower on 3 or 4 and back down to cold any ideas? Bad blower door or heater core?

Can you adjust the settings and get cold air out? If the blend door was the problem you wouldn't get either extreme. If you can get cold most likely the heater core is plugged or sludged. You can try to run water through the core in the forward and backward direction several times to remove buildup and see if that makes an improvement.