here goes,had my zed for a while then the rad sprung a leak,had it recored,then the water pump went n took out belts as well so was all replaced,then the top water hose on the rad split n also was replaced,this was over about a 2 month period.And just to top it off on thursday the rad burst down the right side popping out the seal,so i think the twats who recored it didnt do it properly,so it was sent back n them n they say tuff luck not fixing it because my water system is running to high a pressure n its not there fault,could this be true or r they just trying it on,help me please ................................

it sounds like head gasket problem pressurising the system??? does it run rough/hot??

no its fine just under half way all the time except when cold obviously,it runs sweet as except for this lil pro n e other idears please ...............

Water presure in the rad/cooling system is a result of the water being hot, no other reason unless something is wrong, ie combustive gasses from the cylinders getting into the water. If you had a head gasket leak or cracked head this would send your temp up in 99% of cases. I have known cars with a head gasket problem run OK, but a sniffer test, where the fumes from the rad are tested, has shown there to be a leak. But too much presure would empty the water pass your rad cap, assuming its working OK, before it blew the rad, I feel.

Try squeezing the hoses when its at running temp, this might give you a clue.

 

When a rad is re cored, they only put your tanks back onto the new core. Where did it blow, if it was the core itself I reakon it was faulty. The amount of preasure rrrrequired to blow a good rad and/or a good hose is very high.....All of this IMHO

Step 1: Replace radiator cap

 

Step 2: Get the coolant checked for signs of HG problems

 

Sounds to me like the rad was dodgy so step 3 is likely to be - replace rad.

 

Andy

i should of taken a pic,but it blew where the core meets the tank on the right side ,even the rubber seal had come right out,i could almost get my finger inside the tank,the cap looks quite new,but i did here a small leak so i put in another very thin rubber washer in addition to the one on the cap which solved the prob,could this of caused all my grief,please dont say yes ill cry............

well if you've put another rubber seal under the rad cap then, yes, this could cause your problems. for one it will raise the system pressure as the spring will have more tension on & second it may be still creating a seal when the pressure gets high & the cap tries to release it.

 

Get a new cap!!!!!!!!!!

well the rad has been sent off to a independant inspector,so when i find out ill let u know thanks for ur help....

Ah Yes But/ The cap only needs to release preasure if it gets too high. This is not a thing that happens during normal running. So even if the washer caused the cap to have too high a blow of point, if the engine is all OK then this will not be a problem.