Did the Blazers always have both upper and lower oil cooling lines or did they change the design at some point?

I can only see the lower one on mine (that runs from near the oil filter to the engine block)... from pictures on the web it looks like there should be upper oil cooler lines coming out the back of the radiator (held on with small clips) on the side where the filler cap is... are these visible from the top of the engine bay with the hood open? - I just can't see them anywhere!

Thanks.

 

drivers side of the radiator is the oil cooler lines, passenger side of the radiator is the tranny cooler lines, you may or may not have a tranny cooler.

 

I don't think they all came with the oil cooler. I know rock auto sells radiators with and without the oil cooler, so there must be some out there without.