AC blowing warm air
Narrow down a car AC problem by comparing airflow, cooling at idle, and driver versus passenger vents. Learn what to check before paying for a recharge.
The WrenchClue guidebook
Engine & cooling
Follow the clues behind heat, leaks and rough running.
5 guides
Why your car is overheating
What to do when your engine overheats, why a full coolant reservoir can be misleading, and how traffic, highway driving, and AC use guide diagnosis.
Tracing an engine oil leak
Learn what an oil spot under a parked car can tell you, what to do after an oil change, and why the source of the leak matters more than the puddle size.
Blown head gasket symptoms
Learn which combinations of coolant loss, white exhaust, and rough running suggest a head gasket leak, what can mimic it, and when to stop driving.
Bad spark plug symptoms
Learn how worn or fouled spark plugs affect starting, idle, and acceleration, what the firing end can reveal, and how a shop separates plug and coil faults.
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