coolant in oil on 1995 Toyota Tercel

If i have a small ammount of coolant in the oil is it the intake manifold or is there another area i should chech before i change the intake manifold gasket?

Asked by for the 1995 Toyota Tercel
could be a head gasket also. have a shop do a leak down test on each cylinder to see if there are any leaks into the cooling system.
has the car overheated??