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[jonathanh]

Hmm confusing.  

Getting both pipes hot seems to suggest that the matrix is getting hot flow.  

What bothers me is that you are getting vac when your heaters are set to 'on'  The system is set up so that when vac is applied the HBV diverts from the matrix.  

If you have climate control, try resetting the servos - somewhere in the manual tells you how to do this.

Also, can you trace the plumbing of the HBV - which pipes go where?

[omega trev]

ok folks
ive had the wipers and scuttle drain off and had a look at the plumbing on the hbv so as follows - the pipe from the back of the engine goes into the inlet of the valve - the top pipe from the outlet of the valve goes down to a tee - the bottom pipe from the outlet goes int the top part of the bulkhead and the bottom pipe from the bulkhead goes into the same tee as the top pipe off the valve
hope that makes sense! i dont have a hand book for the car so i dont know how to reset the climate servos if anyone can help me on that
cheers ian

[Pete Elite]

ok folks
ive had the wipers and scuttle drain off and had a look at the plumbing on the hbv so as follows - the pipe from the back of the engine goes into the inlet of the valve - the top pipe from the outlet of the valve goes down to a tee - the bottom pipe from the outlet goes int the top part of the bulkhead and the bottom pipe from the bulkhead goes into the same tee as the top pipe off the valve
hope that makes sense! i dont have a hand book for the car so i dont know how to reset the climate servos if anyone can help me on that
cheers ian

    You press and hold the Auto and Off buttons for about 5 to 10 seconds and you should here the servos working

[omega trev]

great stuff mate thanks a lot

[omega trev]

right ive tried the reset trick and no difference does the plumbing i described for the hbv sound correct?

[jonathanh]

ok folks
ive had the wipers and scuttle drain off and had a look at the plumbing on the hbv so as follows - the pipe from the back of the engine goes into the inlet of the valve - the top pipe from the outlet of the valve goes down to a tee - the bottom pipe from the outlet goes int the top part of the bulkhead and the bottom pipe from the bulkhead goes into the same tee as the top pipe off the valve
hope that makes sense! i dont have a hand book for the car so i dont know how to reset the climate servos if anyone can help me on that
cheers ian

muppets!  Top of HBV goes to top bulkhead - at least on mine.  Swap em over and see

I'm also not convinced that you vac pipes are right.  the vac feed to the HBV should be on when the valve diverts - when the climate system is set to full chill.  no vac should be applied when it is calling for heat.

[omega trev]

unreal, what a set of jokers! ill swap em over and see what happens. would swapping them cure the fact the temp going quit high and a fair bit of pressure? also the vac pipes are a f)^&*ng maze how would i sort them out if they were incorrect?

[jonathanh]

there's a piping diagram on here somewhere MarkDTM I think posted it some time back.  

[omega trev]

nice one ill have a look for it. im still a little concerned about the pressure though it does get quite high although no hoses blown or blow off at the expansion bottle cap so maybe im worrying over nowt?

[jonathanh]

the cooling system is pressurised on the omega - nothing wrong with it if you are getting pressure when hot.  the cap acts as the pressure relief valve.

try here!  http://www.omegaowners.com/forum/YaBB.pl?num=1152565204

[omega trev]

ok mate thanks for the reassurance im gonna swap the hoses over at the weekend and see what happens so ill post the results i might well give it a flush through while im at it it wont hurt

[omega trev]

ok folks here we go
i have today done a complete overhaul on the plumbing of the heater pipes and vac pipes to and from the hbv so here goes. the vac pipes were totally wrong, the pipe coming from the vac pump went directly to the hbv and the vac pipe coming back from the bulkhead wasnt connected to anything at all  so i have put the pipe from the pump to the ingoing on the bulkhead and connected the pipe coming from the bulkhead to the hbv so i now hav vacuum when the cooling is set and no vac at all when set to hi. also water pipes from the hbv were also incorrect bottom of valve going to top of bulkhead top of valve going to tee peice so ive changed them to. then i did a flush and filled with fresh coolant. the problem im having now is when i start the car with the heaters set on hi the blowers get warm no probs, then i set the climate on lo and get aircon (cold air), then i set back to hi and they stay cold. if i take the vac pipe of the hbv and then replace it the blowers the return to warm again :-? :-? :-? could this mean a knackered or sticky hbv?
yours in frustration
ian

[Andy B]

ok folks here we go
i have today done a complete overhaul on the plumbing of the heater pipes and vac pipes to and from the hbv so here goes. the vac pipes were totally wrong, the pipe coming from the vac pump went directly to the hbv and the vac pipe coming back from the bulkhead wasnt connected to anything at all  so i have put the pipe from the pump to the ingoing on the bulkhead and connected the pipe coming from the bulkhead to the hbv so i now hav vacuum when the cooling is set and no vac at all when set to hi. also water pipes from the hbv were also incorrect bottom of valve going to top of bulkhead top of valve going to tee peice so ive changed them to. then i did a flush and filled with fresh coolant. the problem im having now is when i start the car with the heaters set on hi the blowers get warm no probs, then i set the climate on lo and get aircon (cold air), then i set back to hi and they stay cold. if i take the vac pipe of the hbv and then replace it the blowers the return to warm again :-? :-? :-? could this mean a knackered or sticky hbv?
yours in frustration
ian

Sounds like you need a trip to Rufforth next weekend where you'd be able to get advise & be able to compare under bonnets with yours (oooer! )

[omega trev]

i know mate this would be a massive help but sadly im away and cant make it although i would like someone who really knows what they are doing to have a ganders at the old beast as i dont trust anyone at all other than the top legends on here

[omega trev]

so what do any of you think then does the things ive mentioned point to dodgy hbv or is it something to do with the vac pipe not releasing when i switch back to hi, as i said as soon as take the pipe of and then replace it the heaters go warm again
any ideas