QUOTE(Ashhh @ Oct 8 2018, 11:50 AM)
Hi guys.
My ride has broke down yet again. 2 weeks prior, I've already sent my car into SC due to overheating where the temperature rise up till the warning indicator pop out. They insist the problem is due to the fan motor not functioning well, so they replace that part only.
Only to found out 2 weeks later, the same issue happened again. I was on my way back from Melaka to Cheras, was cruising on highway only at 100~110 km/h; where suddenly the temperature rise till the warning indicator pop out.
My question to fellow drivers and experts, what can cause temperature to rise? Since the fan motor has been changed, that can be rule out for now. I check the water & topup, however it didn't solve the issue. Checked again once reached Cheras, the water only went down by a little. So I doubt there's any leaking there.
Already lodged an official complaint to Proton. Awaiting their reply and due action on this issue. I'm already tired of bringing my care to SC, yet the issue is not rectified properly

When the temperature hit high, did you notice if the fan was running when you stopped the car?
Even if fan failed, it's unlikely to cause high temperature at highway speed due to the draft you get through the radiator.
My suspicions :
1. Intermittent water pump failure/jamming
2. Faulty temperature sender/sensor
3. Sticky thermostat that reduces coolant flow