My car is ****ed up some how but I have no idea what it could be.It happened 2 days ago and i took it to the mechanic and he didnt find any problems. I was driving with the heat on like how i normally do and i dropped my friend off at his house and when i went out of his driveway then but it into first to leave the street my car just died. then i tried to started it up cuz i thought i just stalled it since i didnt give it enough gas but i had to hold the switch for 4 or 5 sec. until the engine turned on but right after that it dies. so i turned off my heat and it started up fine but the right headlight dimmed and the right blinker on the dash stayed lit and the service engine light went on it drove fine when the heat was off so i decided to turn it back on but once i did the car just started to die and i was in 4th or 5th gear so i downshifted to think maybe ill be get more power but it just kept on dieing but my smart gf turned the heat off and it went back to working again but the right blinker and my right headlight was dimmed. of course the mechanic couldnt find anything wrong with it. Then today after i got my car back i was driving and i turned on the heat and the same **** happened.
do you guys have any ideas what is wrong? and how i can fix it.

 

sounds like a short... check the harness around your heater core (it's under the dash)

 

on the passenger side or the drivers?

 

Go to Auto Zone and have them do a diagnostic test to see what the check engine code was.

 

Bad ground maybe? not sure but thats my guess

 

heater core is behind the glove box

alternator?

 

yes, the heater core is in your pass side footwell. It sounds like a harness problem, no doubt. The fact that turning the heat off makes it better makes me think that the problem is the harness around your heater core, but it may be somewhere else (like around the alternator, though I've had problems there, and the symptoms were much different). +1 for getting the fault code read, if you have a handheld, it can tell you what the fault code is as well.

 

It only happens if i have my headlights on if that information helps

 

you have a short. most common place to look is where the harness goes through the firewall or any other wires going through the firewall. sometimes the grommets pop out and allow the wires to rub against the metal firewall. i'v see it happen a few times on foxs

 

Agree with above, insulation has broken & shorting out to another wire or to the metalwork , firewall, bracket, sharp edge, etc etc. You need to get it sorted or the next thing will be possible Alternator damage or even a fire is possible!

You could try pulling the fuse to the heater fan, ( Disconnect the battery negative cable) & then connect an Ohmeter to the heater side of the fuse terminal. You should normally get a reading of a few hundred ohms, with the Fan switch turned on. If it reads a direct short (0 Ohms or very close), get someone to wiggle the harness around until you find where the reading fluctuates, you will have then found where the problem is.