Sudden overheating

[Superpie747]

Engine overheating,  STOP now came on and luckily enough I was in sight of the emergency lay-by on M62 not so smart motorway!!
Never had any issues with temp before runs on half all the time and 99% of my journeys are motorway miles.
Temp rocketed up literally to red in seconds. AA assistant came had a look towed car to next junction but couldn't find anything so after the van running in idle for 20mins or so plus giving it a few revs the temp stayed at its normal level. So AA said give it a Drive and he'd follow behind yet after a few miles on motorway again it shot back up... Tow home so now looking for any possible hints as what it may be ??

[Sol]

Sticking thermostat? Broken spring etc.

[Superpie747]

I was hoping maybe thermostat as very sudden plus ok when in idle just a bit of an odd one as no leaks apart from a bit of water out of expansion tank.

[OMG]

Is it obviously overheating? Not the sender faulty? To be the thermostat it presumably would have to shut after it has already opened, seems unlikely.

[Sol]

True - maybe the plug has come off the sensor at the battery side.

[Superpie747]

New thermostat ordered as been leaking for some time guys in garage showed me the white dried up scale underneath thermostat housing, bit of a lump not like old school thermostats. Bottom rad hose wasn't getting correct Circulation so they believe it to be faulty thermostat. I think I've got it right they did explain.

[Buki]

I had the same thing last year. For some reason, the impeller of the water pump separated from its shaft... As a result, there was no circulation of the coolant trough the system. But at the same time, at idle, the engine could maintain normal temperature. Fixed by replacing the water pump.



           

[Superpie747]

I'm hoping thermostat will fix problem, I Will endeavour to report back after garage has finished with Van. Seems like there maybe a common fault with the overheating issues

[Superpie747]

Latest update, new thermostat which had a leak on it as said above however after fitting sadly still not getting circulation so next up is water pump and Cambelt may as well do Cambelt as comes as a kit plus van has 72000 on clock 2017 plate!!

[Sol]

Ouch