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Mazdas of this era are known for ignition switch weight fatigue. This phenomenon is caused by too much weight on the key ring pulling down on the ignition switch thus causing no continuity. Try wiggling the key to see if it starts. If so, replace the switch and then lightening your key rings to prevent recurrence.

Since he says nothing happens when he turns the key this diagnosis is likely. The other probable cause is a loose battery cable, likely the connection at the starter.

ON the radiator issue. Does it have a plastic top that was black but is now a OD green? If so you should get it changed soon as a catastrophic failure is possible and a leak in the near future is likely. If your son didn't mention the starting difficulty he may neglect "slight" overheating,


This guess my vote.

But I'll co with another obvious possibility not mentioned for $200 Alex.

Are you 100% sure the car is in park? If the shifter is just slightly off - or not in park, it's not going to start (this only applies to automatics, but so few people drive manuals these days...)

If the lights and radio work and the lights are nice and full and bright I doubt it is a battery/charging system issue. If you turn the key and NOTHING happens, I go with ignition switch or it's not in park (or more sinister problems after that). If the engine cranks (turns over) put doesn't start, it is either a spark or fuel problem.
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