hey guys need a bit o help here.
changed my radiator in my lunch break a few mins ago and notice somthin fairly odd.

there was a milky sort of sludge substance in the fluid that came out of my radiator.
it wasnt really thick. just a bit thicker than the coolant that came out.

is this possibly some transmission fluid making its way thru the radiator? or is it somthin more concerning like a head?.

i havnt noticed any miss-firing or anythin odd at all and just done a service on the weekend.

Any help appreciated.
thnx

i have just been advised it could be calcium build up from exccessive coolant use as my last radiator had failed near the bottom.

can anyone confirm this plz?