What diagnostic tools can confirm a faulty thermostat in the Changan Alsvin?

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What diagnostic tools can confirm a faulty thermostat in the Changan Alsvin?

Is it sufficient to rely on temperature gauge behavior and warning lights, o r should owners use OBD-II scanners to monitor radiator and engine head temperatures?

Zarnish asked on 11 Jun 2025 11:46:31 am

1 Answer

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Car Mechanic Expert - on 11 Jun 2025 11:50:11 am

You can confirm thermostat issues using:

OBD-II scanner: Monitor live temperature data from both ECT engine coolant temperature and IAT intake air temperature sensors.

Infrared thermometer: Check temperature differences between upper and lower radiator hoses.

Manual test: Feel radiator hoses—cold lower hose during overheating suggests thermostat is not opening.

⚠️ Don’t rely solely on the dashboard gauge—it often lags behind actual engine temps.