This applies to all models of F150........in the radiator transmission cooler fitting, my old radiator had an o-ring. Didn't look at the new one before installing it, I noticed the o-ring after the job was done and I was looking the old radiator over. Obviously can't re-use the old o-ring. Do replacement radiators come with the o-ring? I bought a Visteon (original was a Johnson Controls). Thought about disconnecting the top line and looking in, but have truck back together for work tomorrow. Anyone replace a radiator in an automatic and notice the o-ring?

 

Yes. I bought some aftermarket brand and am trying to install it right now. The new one came with O-rings. I just can't get the fittings to insert.