When working fairly hard e.g. cruising at 80-90 mph, my Omega now tends to run very hot (approaching 100C) compared to earlier. Recently, this caused the oil level check warning to show, although it was not short of oil. I have had a new thermostat fitted, but this makes no difference. My dealers have checked it out, but can't pinpoint the problem. It seems that either the engine is generating more heat than the cooling system can get rid of, or the cooling system is not dispersing enough heat. Any ideas?

David H, July 2007

where is the omega thermos ate its not getting hot

david, October 2013

Hi have you checked the temperature sensor to make sure you are getting the correct signal.

technician 740314, November 2012

is the fan kicking in? it really could be that simple.

AndyG, September 2011

hi
i have a vauxhall omega 2.0 went to london last week tempreture fine on motorway but as soon as i hit traffic it started to over heat,also happened the other day went to bath 150 miles fine on the motorway till i hit traffic then started to overheat fan cuts in as it should do so not that any ideas
thanks

karl, August 2011

keep cycle no of engine not exceeding 3000cycle/min so heat production will decrease

opels lover, June 2011

Hi I'm Ade had the same problem changed thermostat now changing water pump was told it's a common fault the dealer as assured me that the both usually go together awaiting for car to return from garage with new pump to see if that works il let you know if it's resolved

Ada, March 2011

sounds like water pump or slight obstruction check all pipes and especially pump + thermo

jomega, February 2011

nik i have a similar prob but thefaster i go the cooler car gets hope u sort the problem and can help me sort mine

smeg, November 2009

Probably a bit late to help you but may help somebody else. The oil pick up pipe has a metal "tea strainer" to collect large particles before they get to the oil pump. This part is "cup" shaped and collects debris until the time arrives that it can no longer suck oil up fast enough to supply the engine. drain the oil, remove the lower part of the sump, remove the pick up pipe and bracket and wash it out. about an hours work in total.

Russell, September 2009

sounds like head gasket is leaking under pressure

magss, May 2009

suspect head gaskets are letting by under heavy loads, which is expensive if you get a garage to do it, alternatively the radiator could be a little clogged causing higher tempertures under heavy loads but not at nominal loading on the engine. Try flushing the cooling system and then add a flushing agent and leaving for a week or so and then flush again before refilling with correct coolant and water mix. If this dosent rectify the problem then it probably the head gaskets on there way out, which could go on for ages like they are or could let go tomorrow.

nik, January 2008

Thanks Paul.
The thermostat is new, fitted on my instructionat a cost of over £300 by the Vauxhall main dealer, so it had better be right! Fitting the new one made no difference. Everything else checked except the water pump - dealer's view is that a water pump either works or it doesn't (my experience too), and this is a 'nearly OK' problem - at 60 mph it doesn't overheat, only at 80+ or otherwise working hard. I am not losing coolant. I was hoping to find someone who had similar symptoms.

David H, July 2007

Make sure the thermostat is the right one and is in the right way. Make sure you have enough coolant and the right mixture of cooolant and water. Check to make sure your clutch fan or electric fan is operating properly. Make sure your water pump is working and not leaking. There is a weep hole at the bottom of the water pump. That should not be wet. Make sure your not getting water in the oil, it will be brownish or foamy, not a good sign( bad head gaskets). These are some things to check.

Paul, July 2007