Do you mean if it doesn't start, it will if you turn the AC off? Also, when you say "doesn't turn on", do you mean the starter will not crank the engine or the engine cranks but will not run? If it doesn't crank, does it make any sounds such as a rapid chattering or buzzing sound?
It really sounds like the battery is not always being recharged while driving or there is an intermittent connection. If the generator is intermittent, when it stops working there should be a warning light on the dash or the voltage gauge will drop down a little.
I don't know why turning the AC off would help unless the compressor clutch coil is shorted and affecting a circuit that is tied in with the engine's electrical system. The way to prove that would be to unplug the clutch, turn the AC on, (which won't cool now), and see if the problem still occurs. There still could be an intermittent connection. The AC system could be drawing additional current that makes the bad connection act up. If that's the case, the problem will gradually get worse until it even acts up with the AC turned off.
Thursday, June 3rd, 2010 AT 1:37 PM