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[omega3000]

Had to take my missuz to hospital today "not very well at all" anyway on the way back just for a kick in the teeth the car decided to shoot the temp gauge straight into the red zone , luckily enough i wasn't far from home so got it back without to much trouble . I have checked every hose/HBV/rad and cant see how its overheating ... the drivers side engine bay is wet around the header tank and the car has lost only half a cup of water 
I have ran the car on tickover for over half an hour and it wont overheat , just seems when the car is driven it wont keep cool ...no oil in water or water in oil ...correct antifreeze was used from vx 

Any ideas .

tia 

[martin42]

could it have been an air lock?
if you want me to pop over for a 2nd opinion let me know 

[amba]

If its wet around the drivers side by the header tank could well have built up pressure and leaked through cap which could point to an airlock .

These things always happen at the worst time....Hope wife is ok mate

[omega3000]

could it have been an air lock?
if you want me to pop over for a 2nd opinion let me know 

That would be great martin , just dont know why its doing it ...i noticed it was getting higher than usual on the gauge the other day then today it just boiled over .

Will PM you may address .

Thanks very much for that 

If its wet around the drivers side by the header tank could well have built up pressure and leaked through cap which could point to an airlock .

These things always happen at the worst time....Hope wife is ok mate

Thanks amba , wife is sleeping now after a lot of tests 

[martin42]

no probs mate,just need to get changed and il be over 

[omega3000]

All seems ok for now , maybe need a new header tank cap but i possibly didn't tighten the cap enough to seal properly . Will have to keep an eye on it for a while . If an air lock will this be an ongoing problem that will sort itself out or is there a way to properly expel all possible air out the system 

Thanks to martin ....nice car by the way 

[martin42]

No problem Steve,pleasure to help out,and thanks 

[Dishevelled Den]

Well done 42.

[cem_devecioglu]

Had to take my missuz to hospital today "not very well at all" anyway on the way back just for a kick in the teeth the car decided to shoot the temp gauge straight into the red zone , luckily enough i wasn't far from home so got it back without to much trouble . I have checked every hose/HBV/rad and cant see how its overheating ... the drivers side engine bay is wet around the header tank and the car has lost only half a cup of water 
I have ran the car on tickover for over half an hour and it wont overheat , just seems when the car is driven it wont keep cool ...no oil in water or water in oil ...correct antifreeze was used from vx 

Any ideas .

tia 

check your thermostat.. when you start up your engine (engine cold), keep your hand on the coolant hose that goes to the rad.. if it warms up slowly , you need a new thermostat, but if you feel a sudden heat flow , your thermostat is ok..

[omega3000]

I have trawled the site looking for info on the subject , the only thing i was going to try was put the heaters on full with the cap off and try and burp the system squeezing the pipes as i go ...then i read a comment that the omega does not need this doing as it does it automatically ?

Totally confused now ... but ill try what you said Cem 

[cem_devecioglu]

I have trawled the site looking for info on the subject , the only thing i was going to try was put the heaters on full with the cap off and try and burp the system squeezing the pipes as i go ...then i read a comment that the omega does not need this doing as it does it automatically ?

Totally confused now ... but ill try what you said Cem 

now seen , yours is 97..  when you have spare time, like a sunday, disconnect the rad from the engine and try some rad cleaners (lime dissolver style) , wait some time and use lots of water from a hose.. you will be shocked
 
ps: weekly check your engine for coolant loss.. just in case..

[Andy B]

I have trawled the site looking for info on the subject , the only thing i was going to try was put the heaters on full with the cap off and try and burp the system squeezing the pipes as i go ...then i read a comment that the omega does not need this doing as it does it automatically ?

Totally confused now ... but ill try what you said Cem 

An Omega will self vent/bleed air from the system, but helping it doesn't do any harm. 

[omega3000]

I have trawled the site looking for info on the subject , the only thing i was going to try was put the heaters on full with the cap off and try and burp the system squeezing the pipes as i go ...then i read a comment that the omega does not need this doing as it does it automatically ?

Totally confused now ... but ill try what you said Cem 

An Omega will self vent/bleed air from the system, but helping it doesn't do any harm. 

Ok i have a few things to try .

Heat on full , cap off and burp system.

Check hoses for temp and how fast they get hot .

Will try this and let you know how it goes ...many thanks peeps 

Its a new rad cem  but if i get no joy from the above im going to take the rad off anyway and dig deeper 

[Rods2]

It might be the fan switch or relay for the main fan, so only the auxiliary fan works. Engine, will go into the red and then cool down due to the auxiliary fan pushing air through the radiator

I'm sure somebody on here will know at what temperatures the fans switch on.

[omega3000]

It might be the fan switch or relay for the main fan, so only the auxiliary fan works. Engine, will go into the red and then cool down due to the auxiliary fan pushing air through the radiator

I'm sure somebody on here will know at what temperatures the fans switch on.

That could be a possibilty , i only heard the fans cut in yesterday when it had run into the red ....
I have topped the coolant up then screwed the filler cap on more secure than it was , the temp sits at 95 but no fans are cutting in ...i noticed the gauge rises a bit more when the car is turned off but then as soon as its driven it settles back to 95 .

Squeezed all the pipes with cap off and the stat appears to working correctly.
Where is the fan switch or relay thingy  easy to get to 

What temp should the fans cut in normally , im thinking that all is fine but when it gets to a point of too much heat and needs the assitance of the cooling fans its just boiling over 

[albitz]

May be of some help ?
http://www.omegaowners.com/forum/index.php?topic=90487.0

[omega3000]

Thanks Albs 
The gauge does sit at 95 like in the guide but this quote :

If it climbs a tad above normal and is then brought back down by the fans cutting in then, again, that is normal.
 

Mine does climb above normal but i cant hear any fans cutting in 

[albitz]

Sounds like you need to check out fuses etc for the fans.I vaguely remember when I had similar trouble,there was a fuse (10A iirc)in the engine bay  fuse/relay box for the fans.Its almost hidden by the big thick wiring loom which is in there.Might be worth a look.

[omega3000]

Sounds like you need to check out fuses etc for the fans.I vaguely remember when I had similar trouble,there was a fuse (10A iirc)in the engine bay  fuse/relay box for the fans.Its almost hidden by the big thick wiring loom which is in there.Might be worth a look.

Will check...

If i was to just keep the car running on tickover should the fans cut in eventually like they normally should say in traffic ...im thinking the switch is faulty if the fans dont cut in .

[RobG]

Sounds like you need to check out fuses etc for the fans.I vaguely remember when I had similar trouble,there was a fuse (10A iirc)in the engine bay  fuse/relay box for the fans.Its almost hidden by the big thick wiring loom which is in there.Might be worth a look.

Big green 30A fuse

[albitz]

Nope.This was a small red one.

Just check all of them.

[omega3000]

Nope.This was a small red one.

Just check all of them.

 
All else fails i have a hammer     

[RobG]

Nope.This was a small red one.

Just check all of them.

That`s supposed to be without aircon #8a

http://www.omegaowners.com/forum/YaBB.pl?num=1176542235/0

[omega3000]

Nope.This was a small red one.

Just check all of them.

That`s supposed to be without aircon #8a

http://www.omegaowners.com/forum/YaBB.pl?num=1176542235/0

My aircon has been removed /bypassed with non aircon belt ...if that makes any difference   

[albitz]

I think it would be 18A from that diagram. Bypassed aircon shouldnt make any difference afaik.

[omega3000]

Fusebox in engine bay.

1 GREEN 30 AMP fuse blown

1 SUSPECT GREEN 30 amp blown next to it .

Is this been my problem 

[albitz]

Probably.Replace them and see what happens.

P.S I said small red fuse,but it may actually have been green.

[omega3000]

Probably.Replace them and see what happens.

P.S I said small red fuse,but it may actually have been green.

Had some spares so i have replaced them , found a spare temp switch so that will be my next step if all else fails ..relays look ok but dont know how you tell if they are faulty other than looking for signs of being burnt out 

[omega3000]

These 2 blown 



What do they control/fuse for 

[RobG]

Probably.Replace them and see what happens.

P.S I said small red fuse,but it may actually have been green.

[omega3000]

Hi, i have sorted the overheating problem out ...crossed fingers an all  took the car for a long drive with a bit of town work stop/starts then left the car running when i got back . Fans are cutting in at normal temp keeping it at a level 95 .
Can only presume it was an air lock and/or the header tank cap was not on tight enough 

Didnt find out what the two 30 amp blown fuses were for 

Thanks for all the assistance 

[albitz]

Did you replace the fuses before you went for a drive ?

[omega3000]

Did you replace the fuses before you went for a drive ?

Yes albs i did , it was the first drive since i replaced the fuses