sorry if i dont use the correct names for parts and terms but hope u understand... while at the meet today it was noticed that the water pipe leading from my radiator deflates (goes flat) after the engine is turned off, suggesting that i have got air getting into the system. with the engine turning (sorry that i cant remember your name, u was wearing the orange toruses!) cleared loads off air from the system.
then on the way home my temp gauge was going mad, sometimes going past the 100c mark when stationary, then dropping to 95c when in motion. THEN when i got home i popped open my bonnet to a strange noise like slurping the last bits of a milk shake through a straw, this sounded like it was coming from the main area of the engine or slightly towards the rear.
wondering if anyone could shed some light on this, it was suggested at the meet it may have something to do with when im running on lpg the installer may have mucked up the cooling system
This would indicate that your inwards/ outwards pressure relief valve
on your coolant expansion bottle is blocked or faulty.
When you switch off the engine, the coolant/ air in your system cools
down and contracts and the pressure drops in your sealed sytem as
the volume in coolant drops below the fixed capacity of your system.
To prevent a negative pressure, relevant to ambiant, the pressure
relief valve vents inwards and allows coolant and atmospheric
pressure to equalise.
In your case, as it appears not to be functioning, your top coolant
hose collapses to reduce the volume of your coolant system.
The reason your top hose usually collapses, is because it's subject
to a greater temperature range than the other hoses and softens
more than the other hoses.
If you examine your cap, you'll see 4 vertical slots inside the internal
screw thread that facilitate the inward/ outward venting. In the centre
of the cap you'll see the black valve with small vent holes in it.
Bleed the air out of your system with plenty of 'Burping' of your
top hose and renew the the expansion bottle cap.
Once you have the system functioning correctly, you can then see
if your symptoms persist on a system that is at least working correctly.
If not, return to this thread, don't start a new one so that we lose the
history, and tell us again what's happening.
