It's the one on the right front side when you're facing the engine.
The tank is the same as in the picture.

Am i doing it wrong?

I've just checked my engine, that is the coolant tank that I'm talking about.
It's all water inside thou, during collection of the car I don't think its ever coolant inside.
I've been adding water regularly and believe me i wouldn't if i know its another liquid substance inside.

Is it advisable to change it? maybe get some anti rust coolant.
How often does it need to be topped?

On the Start Stop feature, how come it can restart the car even when the gear is still in D?

Ok guys, i've just called in the service center i visited during my 1k and they said it isn't necessary and i shouldn't be worried.

Apparently using water as a coolant is acceptable for a new car and the radiator coolant flush is done as a routine during your 20k service.
As long as the car is running smoothly they advise to continue what i'm doing and never topup the water above the FULL indicator.

Wouldn't be fair if every MYVI is equipped with the pink coolant but mine is water since it came out from factory.
and the damage its already done, how are they gonna warrant this.
I'm getting my car over to the service center first thing tmr morning to get to the bottom of this.

Good thing i saw the sirap bandung post this morning.

Only my car using water as coolant since factory, whilst other MYVI is the pink liquid substance by default.
Asked them what did they CHECK since 1k already went there but they didn't notify me, they say need go CHECK first.
Conclusion, they don't want to take the blame and thinks I'm the one who removed the coolant and insert water.

Gave them the benefit of my doubt, heading over to the same service center tmr at 830AM.

In any case, they provided me a car which is already different than all the other MYVIs out there.
I hope there isn't any serious rusting, I just checked the coolant bottle and the water is still clear with a slight brown hue.

will Perodua compensate me for their indiligence?

Oh dear.

The amount of misinformation from the earlier posts..

Radiator coolant unless there's a leakage or some other problems generally dont need to be bothered with for a long time.. as long as it remains close to the full line you are good to go..

You only need to top up (and with the same kind of coolant) if it falls below the full line..

You can use water but ONLY as an emergency in cases where lets say there was a leakage  and you are out of coolant. In that case what you need to do is top up with water and then drive to your nearest SC to check the problem AND to replenish it back with a suitable coolant. Not continue running the car with plain ol water..

And to jtee, for them to say you can use water and just radiator flush until 20k km service is.. idk what else to say. There's just so much wrong with those statement..
And also you dont do radiator flush every 20k km. Like i said, the coolant hardly ever needs replacement, ever. Unless theres inherent problems in the first place..
The reason we need coolant is because the radiator will not work unless theres coolant. And if radiators dont work, that will cause your engine to overheat.. and the reason water is not suitable is because water has a lower boiling point than coolants. So the water will get boiled (and turned from liquid to gas) before it can even do a proper job of cooling the engines.
Hence you see a warning on radiator caps not to open it with a hot engine or else you'll get severely burned by the gust of steam rushing out..

Coolants on the other hand have chemicals in them which make them more resistant to the high temperatures and allow them to stay as liquid which in turn allows it to circulate and cool the engine off...

Misinformation such as 20k radiator flush is a routine servicing item and also its alright to run on water as coolant..

I said water will boil. Not radiators will boil.

Already came back from service center and at the office now.
They basically just pumped out the excess water i filled and replace it with the coolant.

Apparently there was coolant in it all along and my smartass went and fill water on top of it. LOL

Yes,

I think they just skimmed the coolant tank and replace what's gone with fresh coolant. It's premixed if not mistaken.
You can request for the coolant flush if you want but there's a fee for it, she said we can opt for it but it's not really necessary.
She was surprised that i asked about it, and i told her because some guys on the internet suggested for the procedure. She thought yall were driving the old MYVI, because the new MYVI never needed a flush so far.

I don't think there's any leakage, I've checked under the hood with a flashlight and the flooring of the parking lot where i park my car daily.

20k coolant flushing was mentioned by the service rep when i inquire about it because someone brought it up here.

With the fresh coolant inside now, would it not mix with the existing water inside the radiator?

Nope, you can check yours if important.
they didn't say require every 20k, they mentioned it because i mention coolant flush and they instantly thought i was driving the old myvi since i requested it and suspect something wrong with my radiator. It is all very vague to me now.

Well, i don't mind paying a lil bit extra for the flush ... don't really think it'll be expensive or lengthy procedure.
Will just be upfront and tell them i topped in water a few times.

The service representative seems to be very nice and helpful,
I can provide you their location and number if you wanna.

Ok guys, i've just called in the service center i visited during my 1k and they said it isn't necessary and i shouldn't be worried.

Apparently using water as a coolant is acceptable for a new car and the radiator coolant flush is done as a routine during your 20k service.
As long as the car is running smoothly they advise to continue what i'm doing and never topup the water above the FULL indicator.

@mushigen

This was what i get after my 1k inspection.
Well, it does say I'll be doing my coolants on my 10k next service.

hi guys... i just got new myvi last friday...
had anyone had an issue when driving in the afternoon; the center aircon vent (left side) chrome will reflect the sunlight directly to your eyes... this is very annoying and how you all fix this issue?
i was thinking of sticking a CF style sxticker to prevent reflection....

Another question that I have is, does anyone use the spare tire? Usually after doing alignment & balancing, I would also rotate the tire to make sure the wear is even. Since our spare tire is full size, if we don't use it then sooner or later the tayar will expire and need to replace with new donut, so won't it be wasteful?

if keep X-ing only end of the day also lppl?

How often is it recommended to rotate tyres?
Do we just pay labor fee and service charge if that's the case? since random tyre shop will be able to do it.

This is my usual request when rotating tyre as well 

I guess I need to learn the 5 tyres rotating sequence now. Otherwise the spare tyre will just gone without even be used.

Interested in the Myvi as a second car.

Drove the Myvi 1.5 H a couple of times and the throttle response during stop start driving seems to be a bit slow, 1-2 seconds to react. This is due to the drive-by-wire gas pedal.

Will the 1.3 G manual have better throttle response?