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Drivers have been warned over the hidden car compartment mechanics "don’t want you to know". Top YouTuber and content creator Scotty Kilmer has revealed petrol and diesel cars contain a hidden air filter that "nobody knows about”.

He said: "Today I'm going to tell you about the hidden air filter fitted in your car that nobody knows about. It's called the cabin air filter. You squeeze the glove box and it comes out. If you look inside, there’s a cover that snaps off and out comes the cabin air filter.

"This filters the air that goes into your air conditioning and heating system. Clean it out once in a while by whacking it on concrete until all the crumbs come out of it. If it's real dirt, you can go and replace it.

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