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Q: heater core problem on 2003 Mitsubishi Diamante

if the pipe or faulty
o-ring leaks from my heater core...what would it affect to make the neutral light flash alternately while im driving? and the car has poor acceleration...the car drives but i cant hear the transmission shift through each gear like it should. plse help
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probably not related unless the heater core is leaking fluid onto neutral saftey swith or related wiring and causing interference,sounds like a job for a qualifyed shop
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