Car: Fiat Punto 1.2 16V petrol
So, I had no problems with the driving of the car (no strange noises, no overheating), then the car was parked for ~6 h (so totally cool engine).
Then I've started it (also no weird sounds) went on the motorway, went from it (this took ~5-10 min in total) and then the engine temperature was starting to go up really fast until the red light went on, so I've stopped the car. Opened the bonnet (temperature went quickly to normal), shook a bit the temperature sensor to see if it's maybe malfunctioning (jittery reading or something), but it was all ok. The area near the sensor was indeed warm. Then I've checked the coolant, the coolant was cold so I've opened it slowly, but it sprayed all around (so it was under pressure). The coolant was all there, so no missing coolant. Electric fan is working. I've proceeded to drive further as the temperature seemed ok, after ~500 m same happened. I've put cabin heating at full + heater fan, but the air wasn't hot.
What do you think it could be?
I was thinking clogged hoses, water pump failure or thermostat failure (albeit not a normal failure mode of it).
Any tips on how to differentiate? I was thinking of using a thermal camera to see maybe something and then try to change the thermostat with a new one and test the old one if it works.
So, I had no problems with the driving of the car (no strange noises, no overheating), then the car was parked for ~6 h (so totally cool engine).
Then I've started it (also no weird sounds) went on the motorway, went from it (this took ~5-10 min in total) and then the engine temperature was starting to go up really fast until the red light went on, so I've stopped the car. Opened the bonnet (temperature went quickly to normal), shook a bit the temperature sensor to see if it's maybe malfunctioning (jittery reading or something), but it was all ok. The area near the sensor was indeed warm. Then I've checked the coolant, the coolant was cold so I've opened it slowly, but it sprayed all around (so it was under pressure). The coolant was all there, so no missing coolant. Electric fan is working. I've proceeded to drive further as the temperature seemed ok, after ~500 m same happened. I've put cabin heating at full + heater fan, but the air wasn't hot.
What do you think it could be?
I was thinking clogged hoses, water pump failure or thermostat failure (albeit not a normal failure mode of it).
Any tips on how to differentiate? I was thinking of using a thermal camera to see maybe something and then try to change the thermostat with a new one and test the old one if it works.