Have some oil showing up in the rad. Where do I start to find the problem?

Thanks

What car, year, engine?

1989 chevy van. 350

Could be a blown head gasket. Do you have any coolant in the oil?

No. Been down that road before though. Not with this vehicle.

Are you sure it'* oil and not tranny fluid?

It'* a brown in colour. Looks like rust acutually. Just had a flush but there is still some there.

Tranny fluid in the coolant looks like rusty scum. You may have a cracked radiator. Both the water and tranny fluid run through it in different passge ways. Pull your tranny dipstick and see if the fluid is "normal"

I'll do that tomorrow. The rad is fairly new, about 2 years old.

Thanks

If you don't have coolant in the oil then it'* unlikely you have oil in the coolant. Trans fluid is a bit more likely. Check the trans fluid and flush the radiator to see if it comes back. Could be rust. Was it filled with premixed?