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will it over heat at idle or only when driving it ?
any codes set at all ?
will it over heat at idle ?
or only when driving it ?
when will it over heat ?
at idle it is fine ?
only at speed when driving ?
and there is nothing blocking the front of the radiator and the ac condenser fins are all cleaned out good ?
is the fan clutch new ?
have you tested the coolant for emissions in it with the chemical test called block tester most auto parts stores sell ?
if it has a new radiator and water pump and the coolant if full and it has been flushed and you said the fan clutch is good as you say it is the only thing left is a flow issue sometimes caused by a head gasket allowing some compression into the cooling system which will slow down the flow of the coolant and cause an over heating issue
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no a compression test will not show it
it can be showing nothing out of the tail pipe for this type of issue
that is why they sell the block tester which will measure the coolant for any emissions in the coolant
at this point you have covered everything else to cause this issue
how are you making out ?