Technical Slow coolant leak - what should I check?

[oldmanhouse]

The coolant in my GP slowly leaks (from somewhere) over a period of 1 or 2 months. In that time, it'll go from the MAX mark on the expansion tank to well below the MIN. I haven't seen any drips on the driveway that might point to where it's coming from, but the weather has been dire so it's difficult to tell..

It went in for a service about 6 months ago and the radiator got changed because it was leaking apparently.

If it's a complicated thing to troubleshoot, I'll probably just take it the garage but would be nice to save the 30 mile round trip and a bit of cash, perhaps

 

[cmosfxx]

Follow all the lines - inspect every connector and you will find it. The leak is so small you will never see coolant on the road but there is always this pink colored stain near the leaking spot.

 

[veloman]

Worth checking the water pump as they tend to weep when the bearings are failing.