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Old 04-22-2018, 09:08 PM   #1
mawallace
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Water coolant temperature gauge moves rapidly to overheat and then back to normal

After driving my car for 4 miles this evening at about 70 mph my temperature gauge went from the normal 90 degree position to 130 and beyond in 5 secs. The overheat warning light and buzzer came on. I took the foot off the accelerator to bring the car to a standstill and the gauge went straight back to the normal position.

Lifting the bonnet there were no signs of overheating and I drive the rest of the journey at 70 mph with no issues.

I don't think the car could have overheated and it would not have been possible for the coolant temperature to rose then fall so quickly. Any idea's as to the cause. Car has done 50000 miles.

It's a 2.0 tdi
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Old 04-22-2018, 11:53 PM   #2
adam1991
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Computers. Sensors.
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Old 04-22-2018, 11:56 PM   #3
tmw2442
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Have you had any work done recently?
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Old 04-23-2018, 01:00 PM   #4
minu94
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Air bubbles in your coolant most likely
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Old 04-23-2018, 02:11 PM   #5
Sweetjones_29
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Bad thermostat or radiator fan.
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Old 04-23-2018, 09:57 PM   #6
mawallace
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Quote:
Originally Posted by tmw2442 View Post
Have you had any work done recently?
No work done in the last two or three months. Always serviced on the schedule.

Driven today circa 200 miles and seems to be fine. There was point when the gauge rose from 90 to 110 - but then fans cut in and it back down!
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Old 04-24-2018, 10:13 PM   #7
The Fed
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Quote:
Originally Posted by Sweetjones_29 View Post
Bad thermostat or radiator fan.
I bet thermostat.
__________________
(Mostly) Posted by Josh/AWE. Flapper valves are open at idle, close after 1100 RPM during part throttle. Full throttle 1st-4th gear the valves open until throttle let off. 4th gear, 1500 RPM to full throttle closed, closed until 3500 RPM, then open until lift off throttle.
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Old 05-26-2018, 02:57 PM   #8
Storm19999
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The problem

Hi if it's a 2013 on car it's not computer issues or a thermostat. It will 100% be a sticking warm up shield on the water pump. New pump and belt kit for you. If it's warranty your only get a pump no belt kit.

Quote:
Originally Posted by mawallace View Post
After driving my car for 4 miles this evening at about 70 mph my temperature gauge went from the normal 90 degree position to 130 and beyond in 5 secs. The overheat warning light and buzzer came on. I took the foot off the accelerator to bring the car to a standstill and the gauge went straight back to the normal position.

Lifting the bonnet there were no signs of overheating and I drive the rest of the journey at 70 mph with no issues.

I don't think the car could have overheated and it would not have been possible for the coolant temperature to rose then fall so quickly. Any idea's as to the cause. Car has done 50000 miles.

It's a 2.0 tdi
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Old 05-26-2018, 10:59 PM   #9
mawallace
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Yes turned out to be water pump
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