The temperature warning light in my car keeps coming on at speed - what's wrong?
The temperature warning light keeps coming on in my car at speed despite the head gasket being changed twice and a new fan. It doesn't come on unless you push it quite hard. What's wrong?
Asked on 11 September 2017 by Lyz Jones
Answered by
Honest John
Reads as if the temp sensor/sender switch is not switching on the electric fan, or the electric fan is not working. Test the fan by applying 12v directly. If it runs, then replace the sensor/sender switch in the engine block that switches the fan on and off. (You can't do it because it requires a large socket you are unlikely to have, so get a garage to do it.)
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