Radiator Cap

[Gwkey84]

Hi

I have been noticing that there is a hissing coming from the radiator cap when I've been driving for around 30mins.

The truck radiator is burning hot. Is that right?

Thanks

Graham

[Albannach]

Hi

I have been noticing that there is a hissing coming from the radiator cap when I've been driving for around 30mins.

The truck radiator is burning hot. Is that right?

Thanks

Graham

No. Replace the cap.

[TonyN]

Check the rubber on the cap isn't hard or split, and the bit it sits on is clean. Wouldn't hurt to just buy a new cap anyway.

Edit, as above... lol, I type to slow..

[Gwkey84]

Thanks

Should it be just a standard radiator cap the one I have seems yo push in like some sort of pressure release.

Thanks

Graham

[Apache]

You mean the spring under the cap? That IS a normal rad cap. That how it releases coolant to the expansion tank.

[Wolfracer]

Does it have jap(anese) writing on it? Mine did, and I beleive it was as old as the truck. Your local motor factors will have one, or can get one the next day...

[Albannach]

Some caps, I'm not sure where from or why, have a wee button in the centre of them; I think I've seen maybe 3 in my lifetime! Just replace it with a standard 0.9 bar cap.

[Gwkey84]

Does it have jap(anese) writing on it? Mine did, and I beleive it was as old as the truck. Your local motor factors will have one, or can get one the next day...

Yes it does have jap writing on it.

I thought if it didn't have the spring release and was just a sealed cap then the coolant would just be controlled by the expansion chamber (level would go up and down)

it sounds like I do need a new cap.

Thanks

Graham

[gary-r]

Some caps, I'm not sure where from or why, have a wee button in the centre of them; I think I've seen maybe 3 in my lifetime! Just replace it with a standard 0.9 bar cap.

stant racing caps have a wee button - you can push it in and release the pressure on a hot engine without getting 3rd degree burns.

think mine ran at 24psi

[NiftyNev]

Any update on this?

Sounds a bit like the thermostat may not be opening.

Nev