Dalec cap problem

[stevo1980]

Hi, if my Dalek cap is goosed will it cause pressure in my coolant hoses and maybe burst. My top up tank is not filling up and my top hose has ripped. Im thinking this might be my problem.
Steve

[billy739]

when the engine is cold the cap should create a seal if you cannot bolw/suck on the outlet, same as water cannot enter or leave the bottle.

opens up with presure(water expansion) allowing water into the top up tank. is then drawn back into coolant bottle as coolant cools/contracts

if cap is allowing air/ water passed you have a problem- you also will not be able to bleed the system!

blowing/sucking on the cap with it off the bottle will NOT work!

[stevo1980]

so your saying if i have the cap off in my hand, i wont be able to suck or blow thru it even if i blow and suck hard if the seal is working on the cap??
Steve

[Simon Baxter]

If your blowing hoses your head gasket is probably knackered.
The cap should release pressure at about 1 bar.