AN EXPERT mechanic has revealed a free check before a long drive which could save your LIFE.
Scotty Kilmer said the number one cause of a car dying while it drives down the road is a worn out alternator.
He then suggested a quick tip which will help drivers avoid expensive repairs and issues.
On his popular Youtube channel, Kilmer said: "The worst thing that can happen to you while driving is having your car just stop running while you're going down the road."
Scotty continued: "Your alternator supplies electricity to the car so if it goes bad your car will then run off the electricity from the battery.
"Just like an electric car, when the battery gets depleted it will stop running."
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Drivers can now check vehicles themselves to find out exactly what is wrong without spending a penny on expensive mechanics.
He described to his audience of over 70k followers how to check their alternator.
Kilmer said: "If you've got one of these battery jump boxes, just connect it to the car.
"After it starts, if you disconnect the battery jump cable and it dies, that means the alternator is not working."
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The clip inspired other suggestions from viewers.
One said: "Don't forget to check your accesory belt at the same time. It drives the alternator, power steering and water pump.
"A worn belt will break suddenly leaving you in a world of hurt."
Another quipped: "Waiting for Scotty's second channel on marriage tips."
It comes as another mechanic expert revealed how to fix your air con to save hundreds of pounds.
Craig, from Walsall Wood Tyre & Service in Walsall, West Midlands, took to to explain the issues that could affect your aircon.