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[dispondent 1]

i was after some heat from the heater ( none , stone cold ) when i came across a vacume pipe off of what i assume is by pass valve put it back on result ice cold from heater vents ! took it off again result cold but not ice cold ! so took pipes off heater matrix flushed it with hose pipe back and foward result , wicked heater all good! put vacume pipe back on result cold again pipe back off heater good?
the vacume pipe in question goes through bulkhead where heater matrix pipes go, so can i assume heater by pass valve needs replacing? any help much appreciated , bob

[markiemark]

hello mate..just posted same prob when i came across your thread....did you cure problem...does dash have to come out to do this valve or can you bypass this pipe you mentioned.....going to look at this myself at weekend....cheers mark

[ians]

is the HBV plumbed correctly?  You've not had it out and mixed the pipes up when putting it back..?

[jonathanh]

right - the HBV should work by diverting heat past the matrix when vac is applied.

take the vac pipe off and check whether you have permenant vac even with your heater controls on full heat.  if so then suspect the vac solenoid.  If not and you get vac on only when cold is selected and no vac otherwise then suspect the HBV is incorrectly plumbed

I doubt you have a HBV failure 'cos it is diverting when vac is applied as it should do

[vauxfan2k]

I have been studying this issue for the last while and it seems 95% v6 related,

My 2.5v6 estate and 3.0 elite heaters are working great, but my 2.5 cdx is cold when the weather is cold, afaik nothing has been connected wrong, heaters work ok in summer (doh!!) I have the use of a 2.0 16v just now while I do work on it and the heater is significantly better than the v6 ones. must be a different setup.

I remember back in my cavalier days, the 2.0 8v had rubbish heaters but the 1.8 had amazing heaters, again different systems.

 :-? :-?

raises more questions than it answers I know...

[dispondent 1]

no i have not had hbv out ( but dont know if anyone else has ) the heater will not work if the vacume pipe is connected but seems ok when disconected will check vacume on hot /cold  in next couple days, and no mark you can replace/check valve from under bonnet its behind engine there is a thread on how to get to it, and flushing heater matrix can be done easily from under bonnet, this forum is most explicit and all on here seem most helpfull , but do what i did and trawl through all the problems others have had and most of the problems seem common to all. regards bob.