Lack of Hot Air

[Tom_VR6 0]

Im not getting any hot air in the car - not that I need it with this great weather we have been having but still, its the principle.

 

Ive read all the threads I could find on heater matrix, bleeding water system and thermostats, so far I have:

- Tested the thermostat: a OK

- Replaced the thermostat housing that joins to the block as it was cracked

- New heater matrix has been fitted as the old one leaked

- Filled the water up once from the expansion tank -> FLUSH -> and then from the top hose of the rad

- Ran the engine until the fans kicked in and squeezed all the pipes to try and clear any air lock till my hands were red

 

All the hoses are getting hot BUT the one going up to the heater matrix from the engine might just be full of hot air and not water - not 100%.

Temps seem to be rising as they should and all the rest seems to be as it should.

 

All of this came about after replacing the engine. New engine running and sounding great, most importantly no smoking + compression test came back good.

 

Any ideas would be MUCH appreciated as I feel I have done all I can think of.

 

Thanks!

[rado 0]

poss water pump

some of vws had probs with water pumps the fin would losten on the shaft and not pump water a round enough to feed ,matrix etc

[Tom_VR6 0]

Any idea how I could test this? Any other symptoms I should look out for?

I could try the water pump from the old engine if I could diagnose the problem.

[belfastfumanchu 0]

Do you get heat for the first 10 mins or so until the engines warmed up and then it goes cold ? If so then change your bypass valve.

[Tom_VR6 0]

No heat at all Im afraid.

 

Where is this valve - might just go and check it anyway?

[belfastfumanchu 0]

I was arsing around there and posted a reply showing you the bypass valve here

http://the-corrado.net/.archive/forum/viewtopic. ... 076#670076

[Tom_VR6 0]

I can now tell you its not the water pump - took it out and it spins nicely and all the fins are there.

[Tom_VR6 0]

and I dont have a bypass valve on mine so presume its part of the heater matrix - that is new.

 

Back to square one - any more ideas anyone?

[Tom_VR6 0]

Just noticed the pipes on the heater matrix are the wrong way round - would this make a difference?

[belfastfumanchu 0]

Was just told today by VW that theres 373 bypass valves on back order for the whole UK. I've been waiting on my new one for 2 months...anyone else here on the waiting list?