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[Darth Loo-knee]

Went out this morning at just after ten started up first time after the petrol had got through

Slight tapping for a few seconds and a bit of smoke out the back (oil going down the cylinders when changing spark plugs) for a few secs then lovely and quite

Done about 50 miles in her today but when i lifed the bonnet I could heard a hissing coming from the  Coolant Resevoir Cap is this right or do i need another cap?

Thanks for all your Help Guys

[gizza]

i had a hissing sound coming from my 2 ltr when stopped with the engine off and the hbv went in a big way does it lose any water, the hissing sound was air being drawn in through the hbv and then finding its way up to the expansion tank, also the car would smell of hot coolant after a long run i couldnt see any leaks under the car and was only losing a small amount of water before it let go, but try going to a scrappy he may well give you a 2nd hand cap for next to nothing and try that

[Markie]

good work on the start !! but that hissing hmmmm - check levels, for leaks underneath and report back  

[Darth Loo-knee]

good work on the start !! but that hissing hmmmm - check levels, for leaks underneath and report back  

Checked level it seems to have stayed where it is as for leaks dont be saying that don't want to be taking it bits again
No water on the floor when i had parked, can't see anything under the bonnet..
Just that the cap is hissing....

[Darth Loo-knee]

i had a hissing sound coming from my 2 ltr when stopped with the engine off and the hbv went in a big way does it lose any water, the hissing sound was air being drawn in through the hbv and then finding its way up to the expansion tank, also the car would smell of hot coolant after a long run i couldnt see any leaks under the car and was only losing a small amount of water before it let go, but try going to a scrappy he may well give you a 2nd hand cap for next to nothing and try that

Just fitted a new HBV, but maybe an idea to get another cap

[Mike Collins]

The expansion bottle caps on both my V6 have two valves, one I believe to be the overpressure relief and the other works the opposite way round. it allows air in when the system cools and the coolant contracts. I can often hears gentle hissing at the cap after shutdown.
A Halfords copy cap on the shelf has only one valve visible. I can't tell if has more than one function.

It has just occurred to me that if a HBV is drawing in air, could this be caused by no inlet valve in the cap?

[ians]

You sure its the cap L-K?   The breathers when clean do hiss a bit.

[Darth Loo-knee]

You sure its the cap L-K?   The breathers when clean do hiss a bit.

Glad about that i was gonna ask as i never heard them suckin like that

Also the cap has stopped hissing now i have all the air out of the cooling system, i had not done it last night :-? so that is probably why

Thanks Lads
Daz:y