Also filed
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Why the Inside of Your Windshield Gets Greasy Instead of Just Foggy
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Why Your Car's Air Conditioner Leaves a Puddle Under the Passenger Side
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Why a Car Battery Can Test 'Good' but Still Fail the Next Cold Morning
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The Oil Level Is Rising Instead of Falling: Why Some Diesels Can Dilute Engine Oil With Fuel
In this issue
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Why a Diesel Car's Idle Speed Suddenly Rises: It May Be Regenerating the DPF
A slightly higher idle, cooling fan, hotter exhaust smell and changed start-stop behavior can coincide with active diesel particulate filter regeneration.
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Why Your Car's Radiator Fan Can Keep Running After You Turn the Engine Off
Cooling fans can continue after shutdown for several legitimate reasons, but context matters. Learn how coolant temperature, air-conditioning load, turbo heat soak and diesel regeneration change the diagnosis.
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How to Read Tire Sidewall Codes Beyond the Tire Size
Learn how to read tire sidewall codes to understand load index, speed symbol, construction, and date codes, and why your vehicle's placard and manual are crucial.