Toyota Sienna coolant leak

[Bob A]

I have a 2000 Toyota Sienna. It apparently has a small coolant leak because I have to occasionally add coolant to the plastic reservoir. I would like to pressure test the cooling system.

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[380]

Have you noticed any fresh coolant on the ground or running down the side of your block? or coolant in your oil? my first steps before pressure checking the system would just be to look for leaks. if you haven’t seen any under your car then try throwing a piece of clean cardboard or something similar under your when you park it that way it will easier to spot especially if you park it overnight and it dries up. if theres no leaks and your going through coolant than it might be draining in to your block somewhere. if you still have no luck in finding the leak then id say your next step would be to pressure check. but the coolant has to be going somewhere.

[jacobnbr1]

It is most likely to be in the auxiliary heater system running to the rear of the van. Look to the bottom side in the middle area and trace them with your eye and you will see they are rusted and possibly find the leak without pressure testing.

[Bob A]

I appreciate the replies so far and I will do some visual checks as suggested. I would still like to know how to pressure test the Sienna cooling system when there is such limited space to use the pressure tester and adapter.

[dreamer2355]

Did you research to see if they offer any type of adapters to give you extra space? I have never run into that issue yet.

[EricTheCarGuy]

In order to do the pressure test you’re going to have to find the correct adaptor, not sure which one that is unfortunatly. I would also suggest a good visual inspection as coolant tends to leave some nice stains as it leaks making them easier to find.

[Author]

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