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[jonathanh]

ok  is your vac tothe HBV switching on and off as it should?

If so then it is either a duff HBV (wouldn't be the first) or the heater dist unit is playing up.

I'd remove the vac from the HBV, select cold then if your cabin blowers go cool and return to hot when you select heat, that confirms the air dist unit is working.  In this case, new HBV

[omega trev]

right ill give that a go, i know that when i select cold the vac comes on and when i select hot it goes off but if i set to hi the air is warm then set to lo air is cold then set back to hi air stays cold, i then take the vac pipe off valve and replace immediatly and air goes warm again :-? :-? :-? :-?

[jonathanh]

I'm trying to work out whether it is a sticky HBV or somewhere in the air dist unit. when you try the above, block the vac feed to the HBV as well.

sounds like you're almost fixed:  now the downside is that if the previous expert managed to mess up the heater plumbing: what else did they get wrong?

[omega trev]

i know mate this a concern of mine aswell seeing as they did the head gaskets! not sure wether it might be better to sell it and get one from someone on here who knows what they are doing! i love the car itself and it drives great but im just hoping there arnt any more serious problems down there, as i said earlier in the thread it runs at about 97-98 around town but never goes to 100 and the water pipes do get quite pressurised although nothing has blown yet and i can still squeeze them slightly they arnt rock hard, is this normal for the 3ltr v6 lump?

[jonathanh]

i know mate this a concern of mine aswell seeing as they did the head gaskets! not sure wether it might be better to sell it and get one from someone on here who knows what they are doing! i love the car itself and it drives great but im just hoping there arnt any more serious problems down there, as i said earlier in the thread it runs at about 97-98 around town but never goes to 100 and the water pipes do get quite pressurised although nothing has blown yet and i can still squeeze them slightly they arnt rock hard, is this normal for the 3ltr v6 lump?

I think so - been a couple of weekssince I started mine up!!!  Will check at the weekend.  Look like you are nearly fixed

[Deva1992]

I know earlier V6's run very hot, mine always has done, but touch wood, have experienced no problems

[omega trev]

thanks mate thats reassuring mine is a 99 t reg and i think its prefacelift so thats good to hear  

[omega trev]

ive just had my hand up behind the dash and ive noticed that the heater matrix isnt actually fastened to anything could this be part of my problem? it does move around a bit.

[jonathanh]

no idea but it doesn't sound the best to me!!!

[omega trev]

me niether mate but its a rather dash out job to get to the bloody thing nitemare just had a look at a freinds mig its a 2.5 v6 cdx and his plumbing is the same as yours jonathanh, (from the hbv) so changing that back cant have been a bad thing, just need to get some consistancy now but im feeling more and more like hbv is knackered.
dont these things leak when they go wrong tho or is that not in all cases?