Thread: cooling issues.....again

Originally Posted by uninformed

I may do. Problem is I have to order it from the UK....Given there are 3 thicknesses, I will have to either find out the one the mechanic used or strip it down and then order it more time off work

Im about to go for another run, to my work place (if I make it) problem is tomorrow ill have my big heavy trailer in tow as well

I wouldn't be keen on towing as a test drive.

As Rick said... might be a tab to check thickness. If you're unsure though, I believe you can just order the thickest one (no holes) and go with that.

From the top of your thermostat housing should be a 5/16 hose going under the a/c compressor to a round black fitting with 3 hoses on it. THAT thing. If working properly the flow from the thermo housing goes through a restrictor forming a jet pump to pull air bubbles out of the radiator and dump them in the expansion tank. If the jet is blocked bubbles can collect in the top of the engine and rad.

Originally Posted by bee utey

From the top of your thermostat housing should be a 5/16 hose going under the a/c compressor to a round black fitting with 3 hoses on it. THAT thing. If working properly the flow from the thermo housing goes through a restrictor forming a jet pump to pull air bubbles out of the radiator and dump them in the expansion tank. If the jet is blocked bubbles can collect in the top of the engine and rad.

I understand this theory, but I always thought if everything was working as it should, this hose really had no purpose. I.E. After cooling system refilled and a little air ejected or to cater for a pin hole leak... But normally it would be doing nothing.

To put it another way - in this scenario, where are the air bubbles come from?

Lets see if I have this right. 1 x 8mm hose from thermostat housing, 1 x 8mm hose from the radiator. These meet at this ejector valve and then 1 x 8mm hose returns to the expansion tank???

If this is correct, I do not have this. Just a brass T the the 3 hoses connect on.

Bugger I was hoping....

Originally Posted by rick130

........................ or pushing it really hard.

like towing a 1.8t dual axle trailer

Originally Posted by uninformed

Lets see if I have this right. 1 x 8mm hose from thermostat housing, 1 x 8mm hose from the radiator. These meet at this ejector valve and then 1 x 8mm hose returns to the expansion tank???

If this is correct, I do not have this. Just a brass T the the 3 hoses connect on.

Bugger I was hoping....

Correct. There should be flow back into the expansion tank from the thermostat housing via this hose. (Which I think you were describing earlier?)

Edit: looks like this:

http://www.ebay.com.au/itm/Land-Rove...#ht_1147wt_994

I used to use "Xtragold" crap, it sets hard in the bypass hose after a while, i had similar problems to you a few years back, ripped the head off hoping to find a blown head gasket and all was good, while it was apart i rang my father who had a 300tdi disco at the time and he mentioned a collague with the same problem-fitted a new head and then cooked it,-his problem and mine[as then found] was a blocked bypass hose, blocked with xtragold that had set hard.
Richard

Originally Posted by Judo

Correct. There should be flow back into the expansion tank from the thermostat housing via this hose. (Which I think you were describing earlier?)

Edit: looks like this:

Land Rover DISCOVERY 300TDi or DEFENDER 300TDi - SYSTEM AIR BLEED HOSE | eBay

Yep, there is a small hose coming from my t/stat housing to the T piece that has a small hose from top of radiator joining it, then one hose going from the T to the expansion tank.

Just a brass T, nothing like the one in the picture.

I think Im going to not go into work and ring my mechanic first up and see what he wants to do considering the rebuild was only 17k ago with all new genuine parts and machined block/head etc