heater matrix replaced but still no heat - needs some kind of valve?

[Andy Jeffries]

as above...garage says that this valve is no longer made so i have a new matrix but still no heat..what valve are they goin on about and where can i get one from!?

please help as i have no car atm and i cant handle having no heat after spending money on a new matrix!!!

[Diamond Hell]

It sounds like they're talking about the pressure reducing valves in the engine bay.  If you've had a Golf3 matrix fitted you don't need them as it can take the pressure, so that's probably your solution.

[Andy Jeffries]

hmm...its just a mk2 matrix thats been fitted...apparently its the valve that connects to the heat control to regulate the water going into the matrix? hope someone knows what the hell im goin on about?

[cняis]

the two pipes going to your bulkhead - connected to your new matrix - if these have alloy coloured "valves" on them (mounted about 3 inches up the pipework) they could be blocked. these valves are big and you cant miss them. there will be a small "bypass" pipe joing the two valves.

if the pipes have no valves on them then... i guess you could have an air lock? in which case you will need to bleed the coolant.

i assume you connected all the heater control cables back up? 

[Andy Jeffries]

you should have two pipes going through your bulkhead. if these have alloy coloured "valves" on then they could be blocked. if the pipes just feed have no valves on them then... i guess you could have an air lock? in which case you will need to bleed the coolant.

so these valves could in theory be cleaned and re used rather than being replaced - frustrating thing is that they are behind the dash so it needs to come out again and that means more £'s as i just dont have the confidence to do it!

what do the valves actually do?

[Horney]

No that valave is in the engine bay. No need to remove the dash again.

Nick

[cняis]

you should have two pipes going through your bulkhead. if these have alloy coloured "valves" on then they could be blocked. if the pipes just feed have no valves on them then... i guess you could have an air lock? in which case you will need to bleed the coolant.

so these valves could in theory be cleaned and re used rather than being replaced - frustrating thing is that they are behind the dash so it needs to come out again and that means more £'s as i just dont have the confidence to do it!

what do the valves actually do?

sorry i edited the original post (a bit misleading), the valves are in you engine bay, not under the dash. pls re-read my first post 

[Andy Jeffries]

No that valave is in the engine bay. No need to remove the dash again.

Nick

so at no point they were behind the dash rather than in the bay?

car is an 88 btw...

[Horney]

Correct-a-mundo. It should be just the right of the engine on the pipes that head off through the bulkhead.

Nick

[Andy Jeffries]

Correct-a-mundo. It should be just the right of the engine on the pipes that head off through the bulkhead.

Nick

so...what does this valve do?