The problem is the water is linking ender the water pump's bolt

Teresa, change thermostat on 1990 Toyota Taraga. Check the attached links,instruction and guides, Good luck
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Thermostat Tarago Previa Estima TCR
http://toyotatarago.net/1990-1999/online_workshop/pdf/GENERAL_COOLING_SYSTEM_SERVICING.pdf
Replacing your van thermostat
Radiator flush Motor Drain plug Thermostat TCR Tarago Previa Estima

3.4L DOHC V-6 Easy Timing Belt Change - YouTube

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how to toyota engine timing belt & water pump ... - YouTube

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https://www.youtube.com/watch?v=eqxbM03-rIU
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Do you have a video on how to remove and replace a water pump for a ... Timing belt replacement Toyota ...

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www.youtube.com/watch?v=c_MTZLhfCeo
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In the USA the Estima is called Previa, and there may be some differences, depending on whether it has the 2.4L or a 2.2L engine or other options.
Labor Time for this job is One hour.
The water pump on the 2.4 Liter engine is accessed under the vehicle, very likely the same on any engine for these models.
Follow the radiator hoses to the engine until you find the water pump, which is near one of the drive axles.
The thermostat is bolted to the water pump with two bolts.
Drain the cooling system, then using a large pan under to catch any extra coolant when removing the thermostat housing.
Carefully clean the surfaces of both the thermostat housing and the water pump. [Check water pump for coolant seepage, which leaves a crusty beige or pink deposit. If so, replace the water pump.]

Install a new thermostat and gasket (Or O-ring).
Refill the coolant with the same coolant only if it looks clean.
I would also test the coolant to see what the PH is, which needs to be about 7.2 PH. (Coolant will turn acid over time, even when it looks okay.)
Make sure you put as much coolant back into the system as you removed.
Fully warm up the engine, and let it cool down before removing the radiator cap, then check for air in the system, topping up as needed.
The radiator needs to be full to the top.
Also check the overflow reservoir, which has level marks of Low and High, Never fill over the High mark.

have the fault codes read and look for ambient air temp sensor---water temp sensor--- Maf sensor faults.

not quite enough info, but the bearings usually need to be pushed out in a hydraulic press

hi im rob r u looseing water white smoke indercates cracked head or blowen cylinder head gasket and the turbo wont provent it from starting turbos r just to give u more power

the impellors in the water pump are prone to corrosion,especially if no or incorrect radiator additives have been used .this will cause water to stay in motor & boil whilst the water in the radiator stays cold because it cannot circulate.try flushing radiator ,installing a new thermostat (which is more than likely not opening )& radiator cap,refil with correct additive,.if the car still over heats then you will need to replace the water pump.bugger!!

I had same problem, but when I got to top of hill and sat idle for a bit, it would kick down ? replaced thermostat and still happened until I dumped radiator fix for temperature problems, overheating and such and has not happened since, no problems but even when I know the engine has to be overworked and should show hot, it never goes past middle. I'm not sure of name of liquid, got it from a car dealer, but it is basic about $18.

hi farscape250,

It's in the fuel tank with the sender unit

Best regards Johngee10

Electric. All fuel injected vehicle must have an electric pump.