c250td overheating

[shaungriff]

gutted .. went out in my c250td tonight & temp gauge got higher & higher until it was in red. heater blowing cold. yet the hoses don't seem pressurised like head trouble. no oil in water etc. gonna check tomorrow when light. as anyone had any problems with water pump impellers etc ? i hope its not head trouble. thanks shaun

 

[BlackC55]

Water pump impellors have been known to break down and no longer pump. Some of the new ones are plastic!!!

Duo valve may not be opening properly allowing hot coolant into heater system.

Viscous fan may not be operating causing the over heating.

Head gasket may have gone but very very unlikely on these engines.

Hope this helps

 

[television]

gutted .. went out in my c250td tonight & temp gauge got higher & higher until it was in red. heater blowing cold. yet the hoses don't seem pressurised like head trouble. no oil in water etc. gonna check tomorrow when light. as anyone had any problems with water pump impellers etc ? i hope its not head trouble. thanks shaun

Yes there can be problems with the water pumps where the impeller stops, and no circulation once that happens

 

[shaungriff]

thanks for replies... i'm hoping it is the pump. when i got home i found the radiator was cold apart from top corner near top hose. i don't think its the thermostat otherwise the heater would be nice & hot. also if it was head gasket trouble i would expect there to be extra pressure in the cooling system... tomorrow will tell. is it possible to check the impeller without removing the pump such as reaching down the water outlet ? thanks again shaun

 

[BlackC55]

REmoval of pump is the only way to check.

 

[television]

http://www.detali.ru/cat/oem_mb2.as...GM=717.417&CT=M&cat=19S&SID=20&SGR=015&SGN=01

That a lousy way of fitting,no way of testing on the engine.

Is it worth just replacing the impeller Black C55

 

[shaungriff]

i'll take a look in the morning... i'll be happy if its the pump.

 

[shaungriff]

well i removed the water pump & found the plastic impeller had broken in 2 & fallen off so i was very happy. fitted new pump, antifreeze etc ... everything ok now. luckily i wasn't on the motorway when it went otherwise i could've wrecked the engine... the new pump has a metal impeller. thanks for everyones advice shaun

 

[television]

Good work young man, so pleased that you are all sorted, It brings the best in forums out into the open, with what can be done for minimal cost.

 

[230K]

Hi

Same thing happened mine newer impellor is cast alluminium. See Pic attached.

230K

 

[television]

Hi

Same thing happened mine newer impellor is cast alluminium. See Pic attached.

230K

Sadly we are the ones that have to pay for these experiments :cry: :cry: :cry: