Yes, those have been my thoughts exactly. However, I just wanted someone who actually has been there and done that to confirm that in order to remove the petcock completely that little blue tab must be removed with a small screwdriver. Did you ever confirm that your car also has that blue tab protruding out […]

When was the last time you replaced your O2 sensor? (Bosch 13913 “generic” will splice in if you don’t want to spend an extra $100 for the Audi connector)

Have you checked for any stored ECU codes?

Ahhhh… I’m betting that tab is a ‘safety’ to keep the petcock from coming all the way out. Looks like it would go in and hold the petcock at the narrow point on the body. I’ll try to get out in the garage and take a closer look at mine today if I get a […]

My car has about 163k so we’re in roughly the same boat. In my case, the running condition would deteriorate as the car warmed up. The paste used on mine came from a computer processor fan/heat sink installation. Local computer stores should have it. And yes, POS installation is pretty easy especially if you have […]

Here’s the pics: The top pic is a brand new petcock I was hoping to put on the car. The bottom pic is the original petcock presently on car. Slight coolant leak can be seen at arrow by small plastic rectangular tab. I just assumed this tab was part of the new petcock so I […]

Sorry about that Jimbo, you can try uploading your image again. I set default size to 600kb for files and 700kb for jpg or png images.

So far mine seems to have gone away after reapplication of the heat sink paste on the backs of the POS units. Might want to check that on your car Ed.

Ok, here is a picture of the radiator drain petcock on car with the plug fully tightened. As you can see I have a slow drip at the blue rectangular plastic tab (denoted by arrow). This plastic tab seems to protrude out a bit,maybe about 1/8″. Also attached is a new radiator drain plug that […]

I have never fully removed the drain plug while draining my system. I would unscrew it at far as it would go and then flush the system with DI water before tightening and refilling. The tab thing doesn’t ring a bell for me. Maybe post a pic of it if possible?

Hi Ed,

I’ve been dealing with a similar issue myself. I assume you replaced all your coils with original Beru coil units AND boots?

How many miles on your Avant? Have you ever replaced the power output stages on the firewall?