Low radiator coolant and hissing sound when radiator cap open

[pwuser159353826714]

I have honda civic 2005 vti orial.
The coolant in radiator slightly low and no visible leaks. Cap is recently changed. In the morning when i open the radiator cap a hissing sound comes like pressure release

[Xulfiqar]

What is the need to open radiator cap?

[dani_kk]

That's completely normal and again and again you are opening it and letting air molecules seep inside.

[pwuser159353826714]

To check coolant because it decrease after a ride some time

[Xulfiqar]

Coolant is checked in the overflow tank under normal condition - if the overflow is completely empty or completely full then you check the radiator itself.

Otherwise leave the cap alone.

Are you using plain tap water as coolant?

[pwuser159353826714]

No I'm using coolant

[Xulfiqar]

dont open the cap everyday, check the overflow tank to see its level.