hewtown

Hello, noob here, so please bear with me.

I have a slow coolant leak in my 01 A6 2.7T. When I say slow, I mean the low coolant light came on, I filled the reservoir, and about a month later (after daily driving averaging 15 miles) the light comes back.

Also, there's zero evidence of coolant on my garage floor. Cursory (and noob quality) inspection of my engine reveals nothing as well.

The other thing that may or may not be related is that my heater doesn't blow hot air when I'm at idle. I've found a couple threads that explain the heater core flush remedy... so I hope to try that eventually.

But it seems obvious that my coolant leak issue should be my priority.

Any ideas? Thanks in advance.

DaveA6

My 2000 2.7T had a slow leak as well. Had to top off coolant every month or so, but never saw any evidence of coolant on ground. Turned out to be leaking secondary water pump.

4Driver4

Most common 2.7 leak is that aux pump.