Guys, i've noticed something rather peculiar with the cooling system of my car from about a week.The coolant level drops by about 100ml from time to time and with this, the radiator hoses become sucked with pressure developed within the cooling system and released on opening of the radiator cap.There are no visible leaks whatsoever and the pressure is normal upon testing by a friend.Also refilled coolant after getting the whole system flushed making sure to burp it for removal of any air bubbles. Could it be an issue with the thermostat ???Are the hoses reusable ???And is it that my radiators time has expired ???lol. I'm lost.

Check/replace maybe your thermostat and maybe coolant vacuum lines?

Ok,for the thermostat,i do know that the valve opening temperature is engraved on it (82 degrees celsius) but is there a specific part number available for it. I doubt its available locally so any ausi members care to give pointers on where about i can find it when i fly over for x-mas and new years??Coolant vacuum lines??Not really sure where to go about checking that..The only thing i found in the service manual are that of the pipes that circulate coolant..Help..

replace radiator cap?

bitter i think you nailed it on the head...according to the big book of B.S. (uti issued engine repair book) it says that if the radiator hoses are collapsed, than the cause would most likely be a bad radiator cap.

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+1

Argh,i knew i missed something out in the write-up but the radiator cap was the first thing i replaced..Ok, another thing i forgot to mention was that sometimes when the vehicles temperature reaches its normal operation,i open the bonnet and see that the hoses have collapsed but since it is best not to open the cap and refill it,i drive it back home and see that the hoses are fine.I stress the word "sometimes" because the usual scenario is that i end up having to open the cap on seeing that the hoses have contracted,which releases air pressure it has built, further decreasing the coolant level to the mentioned 100ml or so which i eventually have to fill up.I really need some pointers on what the problem may be so that i don't have to end up changing something that was not the cause..I'll try changing the radiator cap again and see if the problem still exists but it really doesn't make sense that it would result in coolant level drop.Right?

> o

Lmao!!!Ok,i didn't realize the radiator cap replacement was a joke,anywho,lol.But i really need help on this issue.Don't want to drive around one day and end up with a blown head gasket..

no the radiator cap is no joke lol..i was just refering to the book i get at school with all these kind of problemes in them.

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owk then,time to change it.Anyways,thanks

This post has been edited by kavy: Dec 19, 2010 - 3:47 AM

yeah i got that aswell, i also found that the bottom rubber seal has bloated up to a large size, probably blocking the overflow port causing such condition as sucked in pipes lol..


twice now ive replaced my cap

Thank you all so much !!!!
I couldn't think that something this tiny could cause such a problem.
This place is the best