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Radiator issue VT executive s2

JedVT

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So.
I have a coolant leak somewhere in the system, the car goes through coolant fairly quick, all hoses have been replaced and radiator replaced a few years back, the car has 370,000 km on it
Underneath my radiator cap there is a sort of blue and black coloured sludge that accumulates, (there’s no water in the oil cap) what could this indicate?
 

Trevor loves holden.

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Heater core leaking? Heater tap stuffed? Sludge in radiator= inlet manifold leaking maybe. Blue sounds odd could be transmission fluid mixing with your coolant depending on color, best to get it sorted, have someone take a look.
 

losh1971

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Like Trev said, I'm thinking LIM gaskets. If they have not been replaced before they will be fucked for sure at that mileage.
 

Sabbath'

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Get the cooling system pressure tested. Then work out if the sludge is a direct correlation to the coolant leak or another issue.
 
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