Galaxy Tdi Head Gasket And Heater Overflow Connection

[ianskill]

1.9 2005....hi,hope someone can help.  Its looking likely i have head gasket failure due to no antifreeze  2 month ago.  i completely broke the propeller from the pump pulley and engine through out smoke.   I left car to thaw,changed the damaged water pump and refilled.  Ever since i am loosing water like 2 liters per 30 mile. Heaters get warm and not overheating,or pressuring at all from expansion tank.No oil contamination or signs in water. I have found out today where the water is loosing.   Bulkhead passenger side,there is like an overflow,something to do with the heaters,heater matrix,above glove box.It is directly under the brake pipes.  Its trickling out of that with felt pressure blowing from it,some wet also from this has got into pass footwell.   Is this some kind of blow off relief valve in even of the coolant system pressurising? thanks for any help

Edited May 4, 2018 by ianskill

[BrianH]

Given theres no pressure in the header tank I'd have thought it unlikely you've blown the head gasket, I can't make out from the photo where your leaking bit is, but there are some plastic bits in the cooling system, its possible the frozen water has split one of them. I'd suggest you remove the leaking bit from the car and inspect it closer to try and see where its leaking from/which bit to replace.

 

Have you got any of the other signs of hg failure - White spots in oil etc?

 

There is also a run on pump fitted to most, this is likely to make more water flow out around that point as its somewhere close in the pipework, Those appear to me to be the pipes that feed the rear heater.

[ianskill]

hi,if you look at photo you will see a small like overflow pipe right in the middle. water is coming from that. it appears that this part is part of the internal heater. there are no signs at all of any water in the oil,thanks

[BrianH]

The only time i've had the dashboard out to look at anything to do with the heater (replace the matrix) is on my old MK1 petrol - I'd imagine the basic heater is the same, the only plumbing is the feeds in and out of the matrix which run in on the top of the matrix. The matrix is arrowed here.

 

There is nothing on the bottom of the matrix, Though it may be able to leak if its faulty of course. I wonder if thats what is happening.

 

Would suggest as a first troubleshooting step to disconnect the matrix and link the two hoses together, then see if your leak stops. If it does I'd suspect you will need to replace the matrix (possible that you might be able to fix the leak, you won't know until you can see whats going on). The dashboard isn't too horrible to remove if you have someone else to help you if you do need to go down that route.

Edited May 5, 2018 by BrianH