#1: Temperature increase while engine not running? Author: melwong, Posted: Sat Jul 14, 2012 10:37 am ---- My temp usually stays at 70-80 C, but i noticed that after i shut the engine say to pump some petrol and switch on again, i noticed the temp goes up to 90 C. Is this normal?
#2: Re: Temperature increase while engine not running? Author: ARRAN, Location: WiltshirePosted: Sat Jul 14, 2012 11:49 am ---- Common sense tells me no, as a car shouldn't get hotter if the engine is not running.. could be a faulty temp sensor.
#3: Re: Temperature increase while engine not running? Author: devotedsniper, Location: Tamworth, StaffordshirePosted: Sat Jul 14, 2012 12:17 pm ---- I'd say it's normal, a cars engine doesn't instantly cool down when the engine stops and because there's no air passing through the radiator (as well as the water isn't circulating) the engine is no longer being cooled hence the temperature increase.
At least that's my logic since every car I've owned increases the temp for a short period of time after being switched off.
#4: Re: Temperature increase while engine not running? Author: kandlbarrett, Location: SwindonPosted: Sat Jul 14, 2012 1:04 pm ---- +1 normal. The engine heat is soaking into the coolant. "Heat soak." It is normal.
In normal driving conditions open road / traffic lights / open road the temp can go up by 7 or 8 degrees before the thermostat reacts and then when the cold water hits the engine it can drop by 12 or 13 degrees before it closes.
To avoid people worrying a lot (most) modern cars have the temp gauge fed by the ECU and not direct by the sensor. In this scenario the gauge is usually damped so that it does not move even though the temperature of the water at the sensor is fluctuating.
The 206 is NOT one of those cars so the gauge represents the water temp not what the ECU wants to show you.
NOTE: That is why a lot of the latest modern cars have a fan that will continue to run after the engine is switched off. Most drivers don't get to witness this but if you do a motorway thrash (usually takes several miles at 100+) then stop and switch off you will hear it.
I am not sure if the diesel 206s do this but my company diesel Focus does as does my company diesel Vauxhall Insignia.
#5: Re: Temperature increase while engine not running? Author: V9977, Location: Athens, GreecePosted: Sat Jul 14, 2012 2:59 pm ---- Eerm..
The water pump stops circulating > heat soak > temp rise
Totaly normal for decades on every vehicle, it can get as high as 100 C then drops quickly
once the engine is running again and pump is turning.
#6: Re: Temperature increase while engine not running? Author: enfantprodige, Location: LiverpoolPosted: Sat Jul 14, 2012 4:19 pm ---- It's normal, especially on petrol engines.
The running temp on mine was always around 90 (sometimes 85, some other a little bit more than 90), but after turning the engine off it went up to 100; switching the engine on again it went back to 85-90.
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