Water leak 2006 XC70 140k?

AlanS · Post by **AlanS** » 20 Mar 2025, 08:45

Long post: 2006 XC70 140k. I found the expansion tank very low. Looked under car (shield removed) to find green fluid around the subframe on the pass. side. Figuring it's 'time', I had my mechanic change my belts, tensioner and water pump. Problem did not go away. We both scoured the engine looking for the leak....NOTHING!. The only thing I can find (and it's minimal) is a drop hanging from the lower crank pulley. Engine is dry, hoses are dry...expansion tank seems intact. WHERE THE HECK IS THE WATER COMING FROM? It was dry fro a long trip I took (300 miles), but then the next morning, there was a puddle under the car...same spot. Any clues where to continue my search?

Post by **jonesg** » 20 Mar 2025, 09:54

radiator, mechanic should have diagnosed before throwing parts.
I wouldn't change the rad until its confirmed with a pressure tester.
Or a dye and test light with magic viewing glasses.
When you look under the hood you don't see the the rad, closest to the engine is the intercooler.

Post by **cn90** » 20 Mar 2025, 15:16

Check the small hose feeding the thermostat housing.
I wrote some tricks for that hose (using genetic heater hose) in this forum.
You will need 7-mm wrench.

Post by **matthew1** » 20 Mar 2025, 16:04

cn90 wrote: ↑20 Mar 2025, 15:16 Check the small hose feeding the thermostat housing.
I wrote some tricks for that hose (using genetic heater hose) in this forum.
You will need 7-mm wrench.

Here are all 57 (56 if you don't count this very thread) of CN90's posts mentioning thermostat housing. search.php?keywords=thermostat+housing& ... mit=Search Tons of great info. Thanks CN90.