Hyundai i10 - Overheating warning

[kiethton]

Some help if possible....

Parent's I10 - 2011, ~65k miles has started showing a red coolant warning

Strangely I took a look at the car yesterday - came on (from cold) within 1/2 mile and would always go off if you turned a corner but re-appear shortly afterward. Not looked to have lost any water and the oil cap is clear - due a service soon though looking at the colour.

Have done a little googling and can't see a likely cause - have instructed them to not drive it until I can get somebody to look at it - what do we think is the likely cause? - initial thoughts are a sensor/waterpump but wouldn't have thought it'd get hot enough within 1/2 mile?

[E-bmw]

Firstly check your manual, you say "red warning" is that level low or temperature high?

If it is coming on round corners you probably need to bleed the system & fill it back up, best done from cold.

[Coilspring]

Live data would help, to see what temperatures are being shown. Could be the temperature sensor, but could be an airlock as above, or a wiring issue affected by rubbing on something when cornering.

If it was mine without any data I would change the sensor 1st, see what happens then.

[kiethton]

Thanks all - have left it with a tame mobile mechanic to take a look when he can - I couldn't see any leaks etc myself - system full and hasn't been disturbed recently (did 200 miles last week)

ETA 200 mile journey, not 20....

Edited by kiethton on Monday 25th March 17:16

[GreenV8S]

If you checked the coolant level, it can't be a true low coolant level fault. If it comes and goes within a few seconds it can't be a true overheating fault.

Given the behaviour you describe I'd be looking for a wiring/connection fault. I'd look at the connector to the low coolant sensor or temp sensor first, and then look for loom mechanical damage or heat damage. A wriggle test is a good way to locate intermittent problems like this.