CarFix · Guides
Battery, charging, cooling, and thermostat faults
No-starts, battery lamps while driving, fans in traffic, and engines that never warm up.
Cold mornings expose weak batteries first
Slow cranking, repeated jump starts, and electronics resetting are early signs that a battery test belongs on the next bay visit.
DiagnosticsAlternator not charging: battery light on while driving
A red battery lamp on the move often means the alternator or belt—not only a weak battery. Test charging voltage before you buy parts.
SafetyCoolant leak and overheating car: common causes before the engine warps
Sweet smell, puddles under the car, and a rising temperature gauge mean stop and book cooling-system diagnostics.
SafetyRadiator fan not working: overheating in traffic but fine on the highway
If the gauge climbs only in queues, suspect the electric cooling fan, relay, or coolant sensor—not only a leak.
DiagnosticsThermostat stuck open: car not warming up and higher fuel use
Heater stays cold and the temperature gauge never rises? A stuck-open thermostat is a common, bookable fix.
FAQ
Battery light on while driving — battery or alternator?
Often charging (alternator/belt). Test voltage before replacing only the battery.
Overheating only in traffic?
Classic electric fan / relay issue when there is no ram air.