Part number for hose connector

[zeeshanzaki]

I need the part number for the hose connector which connects to heater core, engine and top hose goes behind the engine.
This located just above the transmission and has spherical shape. Please see the attached photo with red circle.

[xantia_v6]

That looks rather like the ES9 degassing tank, which is now not generally available. Which car/engine is it for?

[zeeshanzaki]

its from c5 v6.
i can glue it if it is not pressurised.

[xantia_v6]

It is pressurised at cooling system pressure, and is best replaced when it gets brittle, because if it breaks in service, you lose all your coolant very quickly.

Maybe the C5 version is still available. Which model of C5?

[zeeshanzaki]

Its 2001

[zeeshanzaki]

I checked the citroen service website and there is no mention of part number of this tank.

[xantia_v6]

There is more about the Xantia/XM version of the part here: viewtopic.php?f=3&t=56875

[GiveMeABreak]

I've had a good look at the parts and Citroen refer to the degassing tank as part number (1) on the first diagram.

However, if you look on the last diagram, where I have arrowed in red this looks very much like the part in the photograph. Yet, I cannot see any reference to it as a part....

Click diagrams to zoom

[Gibbo2286]

Any chance this Renault one is the same?

https://www.ebay.ie/itm/RENAULT-5-GT-TU ... wBkRZ6I3M

[GiveMeABreak]

I've found a better diagram of the offending part - apparently they refer to it here as a 'Bubble Trap'. Unfortunately still no part number for it.

(1) heater matrix.
(2) Bubble trap.
(3) thermostat.
(4) Coolant outlet housing .
(5) Coolant inlet housing.
(6) Engine cooling radiator .
(7) Header tank.
(8) bleed screw(s) .
(9) Oil / water heat exchanger (automatic gearbox).
(10) Temperature sensor .
(11) temperature switch.

[zeeshanzaki]

Any chance this Renault one is the same?

https://www.ebay.ie/itm/RENAULT-5-GT-TU ... wBkRZ6I3M

This looks similar. I will contact local dealer to see if have i stock.

[zeeshanzaki]

found part number from dealer. It is 646643 and comes with hoses. It is $110.

Thank you very much for your help.

[zeeshanzaki]

i am going to order new part and might take a month to arrive. Is it safe to drive the car in this condition with AC/Heater off. Does coolant still circulate through heater core even if it is not in use. So far I have driven 10km max trip everyday in this condition and with AC off and dont see any drop in coolant level.

[xantia_v6]

It doesn't matter whether heater or A/C is on or off, the de-gas tank is still in the cooling circuit and is subject to the same pressures.

If it is not currently leaking, it should be safe to drive, but be prepared to stop the car immediately if you see any steam, or if the temperature gauge rises unusually. These are wet-liner engines and serious damage happens very quickly if they run out of water.

When you get the new part, can you take some good photos of it for later identification?

[zeeshanzaki]

Issue reappear. So I tied claim little bit more and put some sealant around the hose. No leak from heater hose. After couple of days the radiator from top and bottom started to leak. Never see corrosion in the radiator. coolant is clean. So the question is, is the blocked radiator cause the heater hose leak or fixing heater hose caused radiator leak. Or the thermostat playing up. What else failing which is causing degassing tank and radiator leak. I can replace the radiator but if the problem is somewhere else then it can damage new radiator too.