Coolant: why colours must not be mixed and what to do if they were
Coolant colour guarantees nothing — the additive package is what matters. The types, the consequences of mixing, and how it shows up in diagnostics.
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Blog
Electric window not working: motor, mechanism, or module
A window that moves slowly or stops warns long before it fails. How to separate the motor, the cable mechanism, and the electronics.
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Hesitation under load: the car will not pull
Hesitation under load has a dozen causes but one order of investigation. What to look at first and why fuel trims beat guesswork.
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The engine uses oil: where normal ends and a fault begins
Manufacturers allow oil consumption, and that is not an excuse. Where the line is, how to tell burning from leaking, and what diagnostics shows.
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Rattling underneath: heat shield, mounting, or silencer
A metallic rattle at particular revs usually costs almost nothing to fix. How to tell a heat shield from a blown silencer, and why not to run it on.
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The fuel filter: symptoms of a blockage and why diesel is a special case
A blocked filter shows up under load and at high revs. The symptoms, and why on a diesel the question is more expensive.
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The handbrake will not hold: cable and electronic parking brakes
Most people test the parking brake once a year, at the annual inspection. Why cables stretch, how an electronic parking brake differs, and why winter use needs care.
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Ignition coils: the symptoms people mistake for spark plugs
Coils and plugs produce similar symptoms but are tested differently. How swapping separates them, and why coils die in groups.
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Oil change intervals: why the schedule and reality disagree
The schedule was not written for your route. What "severe conditions" means, why it applies to most drivers, and how to work out an honest interval.
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The cooling fan will not run: where to look
The fan is the last line of defence against overheating. How to test it in two minutes and why the fan itself is usually innocent.
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Rough when cold, fine when warm: why that happens
A symptom that disappears as the engine warms is a clue, not a triviality. Why a cold start exposes what a warm engine hides.
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The auxiliary belt: squeal, cracks, and why a snap stops the car
The accessory belt drives the alternator, water pump, and steering. The wear signs and what happens the moment it snaps.
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