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[bert]

hi ive had new water pump fitted to my 2.5 v6  the coolant is dripping high up at the back of the engine reving engine makes it drip faster can someone please tell what the problem may be and whats the soultion  many thanks

[joshwyatt]

hi ive had new water pump fitted to my 2.5 v6  the coolant is dripping high up at the back of the engine reving engine makes it drip faster can someone please tell what the problem may be and whats the soultion  many thanks

To me that sounds like the HBV (Heater Bypass Valve)...not an uncommon issue on the Omega's.
I've never had this issue myself, so can't advise any further, and I may well be mistaken...but that sounds like it to me.

[bert]

Thanks for the info is HBV easy to change cheers

[Andy B]

Thanks for the info is HBV easy to change cheers

about an hour, plus another 5 mins to put the plasters on! 
Off wipers, off scuttle panel, out with the wiper motor assembly - careful of you driver's wing paint. It's there to the side-ish of the brake servo, 3 hoses & a vacuum pipe on top.

[YZ250]

To add to what Andy and Josh said, there is a 'How To' in the Maintenance section of the Forum.

[YZ250]

Thanks for the info is HBV easy to change cheers

about an hour, plus another 5 mins to put the plasters on! 
Off wipers, off scuttle panel, out with the wiper motor assembly - careful of you driver's wing paint. It's there to the side-ish of the brake servo, 3 hoses & a vacuum pipe on top.

I know where you are coming from Andy. Don't do my knees any good either, kneeling on the landing panel. Good job it doesn't hurt your knuckles when you pull the hoses off

[Andy B]

...
 Don't do my knees any good either, kneeling on the landing panel. ......

I suffer from the same thing. 

[jordan681]

I changed my HBV in about a hour..  but needed hand surgery after.. lol...  but was worth it..   I used the following guide, worked a treat
http://www.omegaowners.com/forum/YaBB.pl?num=1193594464

[bert]

Thank you all for this advice i will have a go at changing the HBV myself cheers to you all

[Marks DTM Calib]

Remember, genuine part only....some of the pattern stuff is VERY poor quality

[bert]

yes fitted the HBV which i bought from vauxhall dealer cost was £38 fitted it by instructions but i forgot to say water was dripping from nearside back of engine it  was still dripping after fitting but not so much ended up putting radweld plus in  which i now have only a very slight drip i will leave over night was i right in putting the radwell in because i no some chaps dont recomend it still to late

[Mr Skrunts]

If still dripping from rear of engine and you have fitted a new HBV then it could be one of the core plugs, think Jimbob had this problem a while back.

[bert]

Thanks for info where are the core plugs  and what are there purpose cheers