Dipstick reservoir full but engine centre black cap reservoir empty

[Madbike]

Hello honestly guys and gal's.

My car Holden comm ve sv6 2007,
I'm a bit fool I search a lots command words in holden comm here. Don't know which is right one.

I want to know right one,
Yesterday I driving there coolant no temptation hot come up yet on dashboard driver....
smooth running,
in the morning cold the car not turn on yet
I check oil is fine (lucky no milky),
I check power steering good,
I check brake fluid good,
I check reservoir dipstick coolant good,

I check centre engine black cap reservoir coolant is EMPTY
I was surprised Oh what THE im a bit stressed now, what can i do this one???......

Thank you for your patience and professional command.

 

[krusing]

Post a photo of the item in question, [not sure what centre black cap is]
and probably you will get an answer to your cryptic question.

 

[Madbike]

This one when engine off when cold
i open black cap coolant empty.
What should I do.

 

[Immortality]

So, to clarify, you got a hot engine temp warning on the dash?

 

[Madbike]

So, to clarify, you got a hot engine temp warning on the dash?

Nope clear done not say warning...
Yesterday, I drive about 3hours on hot sunny day
my car run goods but I'm abit fool.

 

[lout]

most likely you will need a new radiator cap as the coolant is not coming back from the recovery bottle

 

[Immortality]

^^^ that too would be my first suggestion after topping up the coolant.

 

[Madbike]

Ok i get the genius Holden radiator cap and refill topping up the new coolant.
Am I correct or wrong?

Or I have to do
Example: Have to remove all water coolant out and flash then refill coolant then put new radiator cap.

 

[VTS5]

Replace the cap,get a new revised one.

 

[rambunctious]

It's not rocket science, just put some coolant in where the black cap is.
No need to do anything else for the moment.
Check it again in a couple of days.
It won't take much.
They do tend to drop a little especially if there is a slight usage of coolant.
I just checked mine at the black cap this afternoon and it is full and I did 180 k's on the highway on Thursday..