radiator cap bad?

[BOL]

I am not sure what a radiator cap has to do with anything but keeping the fluid in the system. My upper radiator hose being flat... How could a "faulty" radiator cap be to blamed?

 

[kaytbugsdad]

It won't allow the system to vent..... when the system cools down, it actually creates a small vacuum in the system, which is the reason the upper hose is collapsing..... the rubber seal on the bottom of the cap is creating a seal against the neck of the radiator......

 

[BOL]

gotcha thanks alot/

 

[clarkperez2334]

originally posted by: BOL
I am not sure what a radiator cap has to do with anything but keeping the fluid in the system. My upper radiator hose being flat... How could a "faulty" radiator cap be to blamed?

The radiator cap increases the boiling point of your coolant by about 45 F (25 C). The cap is actually a pressure release valve, and on cars it is usually set to 15 psi. The boiling point of water increases when the water is placed under pressure. Rad cap is the only place where this pressure can escape. The pressure pushes the valve open, allowing coolant to escape from the cooling system. This coolant flows through the overflow tube into the bottom of the overflow tank. It keeps air out of the system. When the radiator cools back down, a vacuum is created in the cooling system that pulls open another spring loaded valve, sucking water back in from the bottom of the overflow tank to replace the water that was expelled.

Rad cap plays a vital role in our engine! Bad rad cap could cause the moisture to escape from the steam. So replace your cap now if necessary. Futaba is a good choice... because i'm using that

 

[kimcrwbr1]

Check your overflow tube to the reservor if it is plugged it could cause the hose to collapse also. Pull it off the radiator and blow in it mine on my jeep was plugged in the reservor with some crud in the bottom I had to pull it off and blast it with the hose to remove the crap in it.

 

[hondaxr650]

Check your overflow tube to the reservor if it is plugged it could cause the hose to collapse also. Pull it off the radiator and blow in it mine on my jeep was plugged in the reservor with some crud in the bottom I had to pull it off and blast it with the hose to remove the crap in it.

Yup, that's it 99%of the time, in my experience. Doesn't let the system pull coolant from the reservoir when it cools off.