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Articus
11-27-2015, 05:49 PM
On the AWM 1.8T motor, does anyone have a VW/Audi part number (or just a size so i can order on amazon) for the O ring that is inside the hose that attaches to the lower side of the plastic thermostat housing?
I replaced the housing for sh** and giggles when I was doing flange and other things, but I didn't replace this O ring. It's leaking from their now...

adam044
11-27-2015, 06:30 PM
50 x 4

https://www.ecstuning.com/Audi-B5_A4-Quattro-1.8T/Search/SiteSearch/Thermostat/

Articus
11-27-2015, 06:36 PM
^ Thats the o ring that goes on the thermostat where it sits in the block.

The entire plastic thermostat housing has another end on it. That is a quick disconnect type connection into a hose that comes from below (radiator hose maybe?). Inside the tip of that hose is the oring that I need.
https://c1552172.ssl.cf0.rackcdn.com/745734_x800.jpg

adam044
11-27-2015, 06:39 PM
Oh my bad thought thats what you were looking for.

walky_talky20
11-27-2015, 08:48 PM
If its the same size as the ones on the radiator, it would be 32 x 4mm. More info here

http://www.audizine.com/forum/showthread.php/678715-Coolant-system-o-rings-(replacing-them-all)?p=11205464&viewfull=1#post11205464

Seems like there is 2 sizes of those connectors: the ones at the radiator, and the ones for the heater core. Not sure if the thermostat one is a match for those, or if it is some 3rd size.