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Discussion Starter #1
My gfs 2010 focus dies when you turn the heat on. If you keep the heat off it runs just fine but as soon as you turn the heat on it dies. Any thoughts?
 

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Hello,
Before further troubleshooting, I want to double check a few things. Is it the car or the gf that runs hot/cold that way?
 

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Other than my silly joke, I got nothing. That symptom is crazy strange.

I can maybe understand, maybe guess, if the symptoms rolled in very slow (hot verses cold) but yours seems to cut-in/cut-out very fast... which makes it so strange.

Does the engine run ok if on AC, and temperature set to cold, and on each cabin-air fan speed (low to high fan speeds)?
 

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Discussion Starter #5
As soon as i turned the heat on the motor would die. I cleaned the negative terminal on the battery and it fixed it( for the moment at least) so now its back ti running normally
 

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My first though was a draw issue but it was starting fine so crazy for it to start but die from a blower draw. Test your starting amps on that blower. The bearing could be going out. Idk. Did it die at idle or at speed. Could be a weak alternator or battery.
 
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