Truck is recently loosing anti freeze. I took it to a mechanic shop. He put on a pressure test and left it over night. He said it is not leaking from the test. Fast forward a week, I have been noticing antifreeze under my truck. It's pooling on the fan and looks like it's splatering around under the hood. My question is would it be my Rad? Or something else leaking? I checked my hoses (upper and lower) theyre fine.

 

Probably the water pump. They are sneaky like that. A pressure test will always show a radiator leak. It might be time to replace the timing belt since the pump is driven by the t-belt. You can see the radiator and water pump easily then. On the other hand, if the water pump is leaking it generally does not hit the cooling fan since it is under a plastic cover. I think it needs to be retested. There is a small bypass hose on the front of the engine that could do that. Again, retest though.

 

I agree with the above answer. A leaky radiator should be readily found by a pressure test. Water pump, being internal, typically will drip behind the pulley.

And yes, there are three small bypass hoses on the passenger side of the engine which maybe have never been replaced.

I'd wash off the engine, get it hot, then turn it off, wait 10 minutes (the coolant can actually get hotter that way. more pressure, then look for a leak. Check the hose clamps, radiator ends, even the cap gasket, radiator cap neck, thermostat housing on right front of cylinder head.

You shouldn't need to do the UV dye/black light type test, you already paid a shop, tell them it's still leaking. Do all leak checking with at least 25% coolant, water evaporates faster and is not greenish.