The safty button on my gear shifter wont push in... I can't get my car out of park. It is a 99 cont auto-trans zetec.

This morning I started my car and let it warm up. When I got in my car to goto work, my heater was turned on. I put the car in drive, I felt a light thump, and my heater shut off. All of this happend right when I put it in drive. I put it back in park and tried turning the knob on the heater. It wont turn back on. At this time I go inside to let my mom know, when I go back out to my car I start it back up. I push down on the break, and the button on my shifter will not go in. I've tried stomping on my break, turning my wheels... everything. I looked under my hood and I dont see any belts broke or out of the ordinary.

Please help me, my car wont go in drive!


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