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[Ryanmt]

Hi guys, ive just acquired a 2.5 V6 CD (N reg).

The heaters only blow cold when set to warm, and cuffing freezing when set to cold. I could see my own breath on the drive home today. Not fun! The fan speed side of things still works fine

The cars getting upto temp just fine so i dont think its an airlock. Its had this fault for a while before i got it and its had the system back flushed incase it was a blockage in the heater matrix but it made little to no difference.

Is there anything i can test to narrow down the fault more? Im assuming its not the control itself as theres 2 and both sides of the car blow cold.

[unlucky alf]

if you can get to them try feeling the hoses as they go into the bulkhead & see if they are warm, or perhaps finding the 2 pipes on the matrix inside the car & check for heat, i take it yours has aircon?

[Bandit127]

Another punt here as I don't know which way round the vacuum works. But if no vacuum = heater is bypassed, then the vacuum pipe might have come off the Heater Bypass Valve (HBV)

[Ryanmt]

Its not got aircon. Ive felt the two pipes to the matrix and theyre definitely getting warm. I was wondering if the pump could have failed and its not circulating as fast as it could though

I had a look at the vacuum pipes and i couldnt see anything amiss, i wasnt sure where teh HBV was, i had a look round the pollen filter but couldnt see much except maybe a black rounded box bolted to the top of it?

[Bandit127]

This is the maintenance guide for changing it. More than you need to know really - but it will tell you what you do need.
http://www.omegaowners.com/forum/YaBB.pl?num=1193594464

[Ryanmt]

perfect, ill pilfer one from the scrapyard soon hopefully along with a new digi screen.

Thanks all