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[smity]

Ok i brought this car on friday and its running great just a bit unsure on the temp because the gauge seems to be noticeably moving between 92 - 96 no matter what im doing i.e driving, stopped its like its heating up then fans cool down then heating up an so on all the time but not getting dangerously hot but just doesn't seem right ive never seen a temp gauge move up and down like this (also never owned a omega)

So i checked the fault codes and got

21 Throttle position sensor - High voltage
91 Oxygen sensor heater - High voltage

(think them codes are correct)

Now does the oxygen code correspond with the temp problem?

Any views on this would be great.

[TheBoy]

Double check the codes aren't a 12 and a 19, as a 19 is a problem

[smity]

I will go and double check but im sure its 21 and 91 as i think i got 12 first

Cheers

[smity]

balls, im no sure its 12 and 19 so how big a problem is that?

[smity]

Anyone im supposed to be going london in this tomorrow 350mile round trip

[Entwood]

Have a quick read here :

http://www.omegaowners.com/forum/YaBB.pl?num=1198358852

might answer your question... and my Miggy is dead .. suspect crank sensor ...

[Bandit127]

Drifting slightly off topic but...

The boiling point of water depnnds on its pressure. In the low pressure of the Himalayas water boils at 65 deg C.  Cooking is dangerous as it a) no longer processes indigestible compounds and b) no longer kills bacteria.

Water boils at 0 deg C in a vacuum which is why you don't want to step outside of a spaceship to admire the view.

A car's coolant system is generally pressurised to 5 - 7 psi once up to temp. At 7 psi, water boils at 115 deg C. Therefore (if your expansion tank cap is working) 96 deg is nowhere near boiling point.

This has an unfortunate health implication though. Consider steam coming from your system that is at 7 psi and well above 100 deg C. You take the cap off to take a look... You have just depressurised the whole system and instantaneously lowered the boiling point by 15 deg and the whole lot goes up. That's how people get hurt.

Anyway, hope this helps.

Jim

[smity]

Have a quick read here :

http://www.omegaowners.com/forum/YaBB.pl?num=1198358852

might answer your question... and my Miggy is dead .. suspect crank sensor ...

Ok after reading that i will not be traveling to london in my omega will have to sort another car out some how.

So how hard are these to change?

This won't have nothing to do with the heat problem, thats if it is a problem

[Entwood]

Guide to changing the crank sensor here :

http://www.omegaowners.com/forum/YaBB.pl?num=1174321688

The temp problem is probably totally seperate .. if it is a problem ... do you run with air con / climate control always on or always off ??

If its always off you don't run some of the fans which can cause some fluctuations in temp of coolant..... when always on it seems to be more stable for some reason.

I might be wrong here.. if so a grown up will soon correct me

[TheBoy]

19 is a failing crank sensor. If it does fail completely, it will be going to the nearest garage on a low loader.

Alas, I've been there, done that, came back from France in an Astra and Focus.

[smity]

Drifting slightly off topic but...

The boiling point of water depnnds on its pressure. In the low pressure of the Himalayas water boils at 65 deg C.  Cooking is dangerous as it a) no longer processes indigestible compounds and b) no longer kills bacteria.

Water boils at 0 deg C in a vacuum which is why you don't want to step outside of a spaceship to admire the view.

A car's coolant system is generally pressurised to 5 - 7 psi once up to temp. At 7 psi, water boils at 115 deg C. Therefore (if your expansion tank cap is working) 96 deg is nowhere near boiling point.

This has an unfortunate health implication though. Consider steam coming from your system that is at 7 psi and well above 100 deg C. You take the cap off to take a look... You have just depressurised the whole system and instantaneously lowered the boiling point by 15 deg and the whole lot goes up. That's how people get hurt.

Anyway, hope this helps.

Jim

Thanks mate this does help, i just wondered why its fluctuating so much

[ffcgary1]

Is you car showing any signs of a problem in its running or are you just concerned at the temp gauge going up and down. if its the latter then i would not be too concerned as it is fairly normal to move about a bit on the omega. But saying that my transit connect goes to half way and does not move at all regardless of the traffic i am in but all systems are different and all gauges are diff. So if it does not overheat and does not fail to start then your car wll be fine.

[TheBoy]

In the cold weather, it could drop to around 92 whilst moving nicely. In traffic, will go up to 96 ish before fans drag back down to 94 ish

[smity]

Guide to changing the crank sensor here :

http://www.omegaowners.com/forum/YaBB.pl?num=1174321688

The temp problem is probably totally seperate .. if it is a problem ... do you run with air con / climate control always on or always off ??

If its always off you don't run some of the fans which can cause some fluctuations in temp of coolant..... when always on it seems to be more stable for some reason.

I might be wrong here.. if so a grown up will soon correct me

Yes i had read somewhere that running the air con will keep it cooler so today i have had the climate control on but with ECO pressed and it was fluctuating haven't tried it without yet or with AC on.

[ffcgary1]

I dont think that you have any probs with the system mate, enjoy the trip to the smoke in your miggy and stop worrying about a prob you dont have.