Thanks Paul, the expansion vessel is near minimum level so i'll get some pink coolant & check the inverter side flow as you suggest.

I am wanting to replace the original front camera (series 10) with an after market one using the original wiring and head unit. I understand I need to splice in a 6v -12v adaptor to power the new one. Has anyone attempted this and is there a wiring diagram available for the original camera? If the original camera has 2x feeds can I run 2x new cameras? cheers

From the link I posted you can have full set - 3 wipers - for about £30

You can actually buy the replacement rubber blades rather than the whole thing if you still have the original wipers. I think it was about £50 when I ordered the full set of wipers last, genuine Toyota parts from Japan. Then when I've needed to replace them I've just bought the replacement rubber blades which are about £25. I found that the only UK versions that have the correct fitment were too short, so it would leave a larger portion of the passenger side windscreen untouched at the bottom which was annoying.

The inverter cooling system uses a separate part of the radiator at the bottom so you won't see it. The system involves the radiator plus the cooling pump. The pumps do go faulty, I replaced mine at about 65k miles. If the petrol engine runs you can check if the pump is working by taking off the inverter cooling filler cap which is the one on the right side of the top of the rad. With the engine running there should be some movement of the coolant usually you will see it going up and down in the filler neck. You should also check if there is sufficient coolant in the system. Anyone with a hybrid should consider changing the pump anyway as a precaution as failure is not uncommon at a longish mileage. It is not complicated. Ensure you fill up with Toyota Pink coolant which is non conductive electrically.

Hi, this warning light (red car outline with exclamation mark through it, bottom right of display) has come on along with others (VSC , brake warning & Catalytic converter) which have now cleared, it was a very hot day. The red car remains on & I have lost all hybrid function ie seemingly no hybrid assist or regen braking; no energy flow arrows; no air con etc. Im wondering if it's related to the inverter coolant system, & wanted to check the coolant header, which is described as being a separate tank from the main engine coolant expansion tank but I cannot find a separate tank. Does anyone know if there is a separate header or if not a cooling issue, what else could be causing this fault. Thanks, Chris