How much does a new ac system cost for a car?

How much does a new ac system cost for a car?

Added (1). its a 2003 ford taurus. Already has a ac compressor in it but the bypass pulley is old and rusted and it was fixed before but they said it would be best to get a new ac system… It blows out hot air and when its cold outside it still blows out hot air if thats helps

Diable gear selector safty switch?

I have a 2003 ford Taurus Se, after starting the car the gear selector won't move out of park even after stepping on the break. The safty pin in the steering wheel cover won't release the gear selector. How do you disable this feature?

Car won't start after it overheated 2001 ford Taurus?

Please help me figure out if i should just buy a new car. I was driving on the highway and out of nowhere my car started to lose power. I heard some clanking in the engine and my car shut off wile i was still rolling. I pulled the car over, wile it was still off and there was a cloud of white smoke coming from the engine. I popped the hood and saw that there was water everywhere and water leaking from under the car. I let the car cool down for a wile and tryed to start it up and it would crank for about a second and then seize up. Now the car won't start and i'm not sure why. Anyone know if this is going to be an expensive fix? Or should i just invest in a new car?