Thread: 300tdi cooling system

There's actually 2 types of radiator hoses, one with a plastic Y piece and one without. Expedition style hoses for 300Tdi

Originally Posted by dm_td5

There's actually 2 types of radiator hoses, one with a plastic Y piece and one without. Expedition style hoses for 300Tdi

thanks, but it's actually the thermostat hsg to expansion tank hose I'm asking about, not the radiator hose..

thanks - L

This weekend I replaced the 5/16 and 3/8 hose you are talking about.
I have a TDI 1994 defender 130.
I was wondering what the plastic thing was jointing the hose from the thermostat housing ,the radiator and the header tank.
It appears the plastic thing is hollow and appears to serve only the function of a Y or T piece.
I wonder why the factory fitted the plastic fitting the shape it is ?

Originally Posted by 101 Ron

This weekend I replaced the 5/16 and 3/8 hose you are talking about.
I have a TDI 1994 defender 130.
I was wondering what the plastic thing was jointing the hose from the thermostat housing ,the radiator and the header tank.
It appears the plastic thing is hollow and appears to serve only the function of a Y or T piece.
I wonder why the factory fitted the plastic fitting the shape it is ?

Yes, thanks Ron,

we were wondering if the plastic "Y" piece had a non-return function to specifically not allow flow back from the thermostat housing to the expansion (header) tank........

thanks - Laurie

Originally Posted by 87County

Yes, thanks Ron,

we were wondering if the plastic "Y" piece had a non-return function to specifically not allow flow back from the thermostat housing to the expansion (header) tank........

thanks - Laurie

I used to wonder if it was a check valve (NRV) too, but you could blow through both ways when I replaced mine (as a precaution)

it's just a bleed.

Just discovered the plastic "Y" piece was weeping coolant on my Defender 300tdi. However, I'm not having much success tracking down an alternative to the oem (that comes with all the hoses). I only need the "Y" piece as I replaced the hoses about 12 months ago.

Has anyone found an alternative Y or T piece fitting??

--------------------
Nigel

go to pirtek or enzed or the like and get a brass t or y-piece to fit.

its y shaped to help with the bleeding system... works kind of on the venturi system...

It doesnt HAVE to be a y junction if you bleed up properly but it does help the bleeding process.
.