Radiator cap

blockh3ad · Post by **blockh3ad** » Mon Jun 18, 2018 9:15 pm

Can any body help I have resently had a few what pipes burst and replaced the radiator cap the one I took off was 0.9 bar and the one I put on was 1.1 bar would this make my lud overheat

Andyjess666 · Post by **Andyjess666** » Mon Jun 18, 2018 9:46 pm

Test your thermostat mate that was my problem when mine overheated

blockh3ad · Post by **blockh3ad** » Mon Jun 18, 2018 9:51 pm

Changed that replaced heater matrix and flushed the water system there is no oil in the water and no gunk on the oil filler cap I'm at a loss all I can think of is the radiator cap

Post by **vanzep** » Mon Jun 18, 2018 10:37 pm

rad cap should be 1.1 if its a vtec
sounds like air in the system - maybe bleed it some more

thats quite a job to replace the heater matrix

blockh3ad · Post by **blockh3ad** » Tue Jun 19, 2018 5:25 am

You're telling me

Scott560 · Post by **Scott560** » Tue Jun 19, 2018 8:07 am

only time i ever had a pipe burst open was when the head gasket had gone. Generally thermostats fail open (over cooling not overheating) and a busted cap i wouldn't have thought would raise pressure that high enough to burst a pipe - they are usually reinforced with a fibre inner liner.

a HG can fail in many ways, the age old symptom of oil/water mix is not the only indicator.

I once had a metro GTi where the HG perished, and water squirted out directly through a gap between the headlight and bumper, burning my crotch lol - bloody thing!

The last time i saw a popped rad hose the HG was well and truly gone (combustion chamber breach to coolant way), no oil/water mix in that case either. Also, upon fixing everything, i then found out the rad was split aswell (swelled up under pressure).

Just my experience of exploding pipes.

Old/knackered pipes tend to tear at the joints (near the clips) from repeated movements where the strain is the greatest. Exploded pipes tend to rip in the middle all the way along (from my experience).

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Tue Jun 19, 2018 8:35 am

When you say a few hoses burst...
How many, which ones and any pics?

Post by **vanzep** » Tue Jun 19, 2018 9:31 am

sometimes the hoses just get to the age where they need replaced especially if theyve had oil leaking onto them- ive replaced 4 in my BB4 - the two small hoses at the oil cooler, the front rad hose and the hose from the side of the block under the dizzy

blockh3ad · Post by **blockh3ad** » Tue Jun 19, 2018 10:24 am

One on the oil cooler and one that goes to the cold air intake that one was perished. When it over heats if I turn the temp. Up in the car it cools down

Post by **vanzep** » Tue Jun 19, 2018 1:21 pm

Could be an airlock and like andyjess mentioned worth checking the thermostat and rebleeding the system - turn the heater up to max when up to temp and bleeding it.