Hissing from top radiator hose?..

[Brody Sherri]

Hissing noise from top radiator hose ?? Car isn't overheating no issues but I recently changed my inlet manifold gaskets I didn't do a coolant flush and stuff should I be flushing my coolant and re adding more
If so do I.need.to flush the hole block ect or just the RAD
Probs stupid question but I got idea I seen people with write ups flushing there.block or just radiator what's the go there

 

[VYCommodore76]

did you bleed the air out of the system after you changed the inlet gaskets by filling with coolant, unscrewing that screw in your pic until coolant starts dribbling out, then re-tighten? I wouldn't bother with a flush unless there is oil or contaminates in the coolant. Just add more to the appropriate fill line. It is very important to bleed the air out of the system with the ecotec v6 as I said previously.

 

[Brody Sherri]

did you bleed the air out of the system after you changed the inlet gaskets by filling with coolant, unscrewing that screw in your pic until coolant starts dribbling out, then re-tighten? I wouldn't bother with a flush unless there is oil or contaminates in the coolant. Just add more to the appropriate fill line. It is very important to bleed the air out of the system with the ecotec v6 as I said previously.

I will do that mate cheers