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[eyad]

Hello gents,
I drive an Omega 2.2 16v, engine Z22XE
coolant level  slightly decreasing  evey 3-4 weeks , and this happened more than once. the alarm in dash board goes on , I add about 300 ml ( 2 coffee cups ) of coolant and the alarm goes away.

The car does not overheat ,
According to local Opel dealer there is no leackage or known problem ( i.e:normal ?!).
I could not see a clear sign of any leak anywhere in engine room .But I don't buy that its normal!

 if anyone has some tips of what could be worng , please arm me with info before going to maintenace again!.

[wakeyomega]

I had exactly this on my 2.5 Omega. Several years before I found the cause, the local dealer warned me I had a very expensive water leak. By accident I discovered is was no more than the radiator tap which was weeping. I was having to top up every 1000 miles. I never saw any water on the drive so must assume it was weeping very slightly but only under pressure. Good Luck

Pat

[old cruiser]

Also run your fingers round where the pipes join onto the coolant tank to see if they're wet, particularly the lower one as mine was leaking here(more noticeable after a few minutes of turning engine off) had same symptoms as yours
Cheers Pete

[eyad]

thanks guys,

since in this model there is no radiator cab , I'm assuming it could be the coolant tank or cover weaping  under pressure or the pipes joining coolant tank.

I'll examine these . thanks for the tips!.

[ians]

Could be your heater bypass valve seeping, although in my experience (2x) when they go they go.

If it is only leaking a bit it may be evaporating before it hits the ground.    

[tunnie]

thanks guys,

since in this model there is no radiator cab , I'm assuming it could be the coolant tank or cover weaping  under pressure or the pipes joining coolant tank.

I'll examine these . thanks for the tips!.

There is a radiator tap on the 2.2!!

Its the red tap on the passenger side, see here:



It also could be a weaping water pump, when was it last changed?

[ians]

I think he meant 'cap' but may be wrong..

[TheBoy]

All Omegas have radiator drain tap, as pictured by Tunnie above...

[eyad]

yes , there is radiator tab , I thought you were reffering for upper cap as in other cars.

any ways, about the heater bypass valve , how can i check it its  about to break.

[ians]

I am not sure where its located on the 2.2 - but its bound to be highly inaccessible

On my 2.0 , which may well be the same,  it is low down between the engine block and the bulkhead into the car.  Access from underneath.   Its a black plastic unti with three pipes coming off it and a vacuum pipe.  

Someone with a 2.2 can confirm though. (tunnie?)

Have a look under the car to see if there is any dripping when its running first of all.
Otherwise get it up on stands/ramp and see if you can locate any dampness on it.

You are not losing a huge amount of coolant so its likely to be difficult to detect unless the engine is running or just stopped.

..and watch you dont burn yourself on the exhaust

[eyad]

Folks,

I searched the hoses, water pump ....etc and coolant tank/cover for any sign of leak, evaboration or moisture just after turning off the car ....nothing un-usual.

how ever , I found a v. large wet area on radiator front side and traces of moisture below the radiator ( on the lower plastic protection cover )   near/ below the front bumper).

I think radiator is 1st thing to check ?

Just can't find the radiator tab, even running my fingers around it:-/

[TheBoy]

Folks,

I searched the hoses, water pump ....etc and coolant tank/cover for any sign of leak, evaboration or moisture just after turning off the car ....nothing un-usual.

how ever , I found a v. large wet area on radiator front side and traces of moisture below the radiator ( on the lower plastic protection cover )   near/ below the front bumper).

I think radiator is 1st thing to check ?

Just can't find the radiator tab, even running my fingers around it:-/

Being a hot country, the pool of water isn't condensation from A/C condensor, rather than related to your coolant loss?

[eyad]

its not summer yet here , and I did not start the A/C since months ago . usually the excess condenced coolant drops down the car into the ground via some hose.
 but the water pool on the radiator front  shouldn't be considred sign of leak/evaboration ?

[TheBoy]

its not summer yet here , and I did not start the A/C since months ago . usually the excess condenced coolant drops down the car into the ground via some hose.
 but the water pool on the radiator front  shouldn't be considred sign of leak/evaboration ?

Is it pure water that you see, or the sweet smell/taste of antifreeze?

[old cruiser]

have a closer look at the bottom hose as it could be weeping and running down from there, otherwise could just be a faulty Radiator.
Cheers Pete