2007 Sienna LE with ~200k miles. I noticed that my coolant was low in the overflow tank. It was a good bit below the "low" mark but I could still see that there was some coolant in the tank. There was no overheating issue. I was just doing fluid level checks.
I had to replace the water pump in March. I assume the coolant was filled to the appropriate level at that time. The next time I did any maintenance was in September when I got the oil changed. Not entirely sure if they checked fluid levels or just did the oil change. So this is either a 9 month leak or a 3 month leak.
Red line is about the level where the coolant was.
The hose and clamp right below the radiator cap seems to have a leak at the connection point. Green box is zoomed in below.
I think the spots in the yellow box are coolant leaking from below the radiator cap that dripped down onto the pipe and burnt off. I am not 100% sure if the red box is accumulated drippage from above or a leak itself at that connection point.
I don't have good access to the lower pipe/hose but I cleaned off the hose below the radiator cap. This is one week after cleaning it.
Definitely seems like a leak there. Not only where the hose connects but around the clamp as well.
I left a mark on the coolant overflow tank after I refilled it last week. It has barely moved, if at all, in one week. There are no drip spots under the car either. This is a very slow leak.
What all is involved in replacing the upper hose and the lower hose? Does anyone have part numbers? Any other spot I should check for leaks?
Thanks.
