Mini cooper r53 water (coolant) problem :(

[wanni]

Hi guys , i'm new here... and i hope so that someone will help me :D

Like first i own mini cooper r53, BY 2004..... car have 150 TKM ( app 100K miles)
I have fev problems with coolant sistem...

Few weeks ago in midle of drving i turned heating on and my expansion tank exploded ( separated on 2 peaces ) so i took my car ( not driving) to the shop and they find that i need to replace expansion tank and radiator and heater core ( expansion tank blowed because heater core was sealed ). reasons is becaose preowner putt pure water in cooling system :( ....
so i changed Radiator,expansion tank, heater core and three watter plastic separators. put mixture 60 coolant 40 water. and bleeded systerm.

Tested agein, drived few days i have great heating then today i kicked "pedal to metal" and approx at 5500 rpm in second gear steam come from hood immediatley stopped and turned off car... i looked under hood and i find that shoort hose that runs from branches to watter pump is broken....

So if someone can help me can broken water pump can cause rupture on hose :(

and also i checked ther is noo milk cremy on oil cap or expansion tank cap, there is no bubless in coolant no oil&coolant mixture , no foamy look at dipstic or gasoline smell in oil , no white steam from exoust :( ------ also there is no overheating... radiator fan work it kick on 105C ...

If anyone have idea what can cause this mess ?

[jclausen]

At this point I would test the coolant to see if there is combustion gases in it, it the coolant does not have to be milky to indicate a blown head gasket or cracked head. They have these testers that start out certain color and change to another color if the coolant of contaminated.

[wanni]

I thinked about tester , but right now im live and work for ambasy in Bosnia&Heregovina so belive or not there i cant find to buy tester .... only on ebay but they need more than 30 days to deliver :(
Only what we can test is pressure in cooling sistem but agein there is problem novere i cant find what is normal presure in cooling systeim of MCS 04....

also probably i will change headgasket and waterpump because mechanic told to me that replacment of headgasket, handling head , refreshin cylnders, with new water pump, and new coolant and oil will cost me aprox. 450$ ( 450$ including new headgasket and water pump) ... and he need 3 days for finishing job... so i will cal him later and ordered work.

[mnaojkeshwar]

I thinked about tester , but right now im live and work for ambasy in Bosnia&Heregovina so belive or not there i cant find to buy tester .... only on ebay but they need more than 30 days to deliver :(
Only what we can test is pressure in cooling sistem but agein there is problem novere i cant find what is normal presure in cooling systeim of MCS 04....

also probably i will change headgasket and waterpump because mechanic told to me that replacment of headgasket, handling head , refreshin cylnders, with new water pump, and new coolant and oil will cost me aprox. 450$ ( 450$ including new headgasket and water pump) ... and he need 3 days for finishing job... so i will cal him later and ordered work.

Thanks wanni to give positive response