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2011 Sienna V6 LE Coolant leak

13K views 14 replies 8 participants last post by  SBean  
I'll chime in. I had a coolant leak on my 05 Sienna LE several years ago. The coolant was leaking out over the transmission side of the engine. I tore it down and discovered it was the gasket for the Engine Coolant Thermostat Housing (Toyota Part No. 1632320020). I made a new gasket and put it all back together. Didn't have a leak for 200,000 miles. Now, at 300,000 miles, it's starting to leak again in the same place. It took me 2 hours to get down to it again. I'll replace the gasket tonight and put her back together. I also saw that the Intake Manifold To Head Gaskets - (Toyota Part Nos. 1717720020 & 1717820020) had torn on the corners over the coolant well. I am replacing those also. (See photos.)
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