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I've just noticed that my engine coolant bottle is empty.  Although I check it regularly,  I had been misreading it: the shelf inside creates a shadow on the side of the bottle which i had mistakenly thought to be the fluid level.  I'm pretty sure that the coolant level is not seriously low because there has been no trouble with high engine temperatures, and I can detect warm water inside the radiator top hose.  

So, now I'm wondering which coolant to add: and I have no idea what is in the engine already.  I can see the hybid coolant is the pink/ orange one and I have both blue and pink in stock in my garage. I know it's not a great idea to mix the two colours.   

What would you do?  I suppose I could detach the top radiator hose and see what colour comes out.  

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I would bin both of those (or keep for a different car if you have more than one in the household) and use whatever is recommended in the manual, which may possibly be Toyota Super Long Life Pink (which is what our RX300 had).

I have no qualms about buying things such as batteries, wipers, exhausts, tyres etc., etc., from other sources but with any fluids I always stick to the recommended one because you just cannot be sure of the exact chemical component blends. Any system that carries fluids will also have rubber (or other material) seals and just one wrong chemical could attack these seals, causing leaks and untold damage further down the line.

In my opinion it's just not worth it to save a few quid.

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ok Herbie, point taken.  

Anyway, I have just discovered the radiator cap beneath the cover on the left hand side of the vehicle.  I didn't look under there earlier, as I thought that was all hybrid inverter stuff.  

In the top of the radiator, I can see the fluid is red (which from my research seems to be the colour of the Toyota SLLC).  But, I'm now confused about why I can see fluid in the top of the radiator , when this is higher than the level in the expansion bottle (which I think is empty), and also higher than the fluid level in the radiator top hose (which I noticed to be hot on the bottom and cool on top, and seems to contain air when I squeeze it).  

I will be topping up as a short term solution, and plan a full drain and refill in the near future.  

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Levels sometimes seem to have a mind of their own!

However, I agree, use the recommended Toyota Red stuff.

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It took about 400ml to fill the radiator. Then about 50ml to bring a visible fluid level in the expansion bottle.  Then a further 150ml to bring the level approximately half way between LOW and HIGH.

The handbook says that it holds 10.3l, so it wasn't dangerously low, but I will keep a closer eye on it in future. I can't say I've noticed any fluid leaks.   

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I'd keep a very careful eye on it as I've had my 400h for 5 years now and it hasn't lost a cm from either the rad or inverter. I don'y know your cars history but it could be weeping out from the water pump.

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