Coolant

[PositronicRay]

I did a coolant change and flush about 6 months ago. Testing with a hydrometer shows the mixture is a little weak so not quite up to the recommended 50/50.

To save me the hassle of climbing underneath to drain, is it ok to syphon some from the header tank and bung in another 1l of concentrate? Will it find it's way into the rad and mix ok?

The car doesn't have a separate cap on the rad, just a cap on the header tank. I just use the cheapo 2yr stuff.

Thanks.

[PositronicRay]

Yes 50/50 is strong, it's just that's the recommended mix for this model, and I have an unopened ltr in the garage.