I was looking at some of the youtube for ody engine removal, the subframe has to be dropped, and engine and trans out the bottom. if you want to take the engine out the top and leave the trans in, the radiator support needs to be cut and welded back in, or the forward head needs to come off. look up odyssey engine removal on youtube and they have a few engine videos.

 

Hold your horses, you started this thread 2 or 3 months ago and haven't figured it out? You said you saw smoke out of the radiator as soon as you started the car, the coolant hasn't had time to even get to temperature, let alone to overheat the coolant. The engine hasn't even had time to warm up yet. The only thing I can even think of is that you have coolant leaking into the cylinder walls. The only thing that could vaporize liquid instantly is where the detonation occurs. You likely have a head gasket leak, the worse kind of leak possible. The other possibility is that you have exhaust leaking into your coolant. Tell the shop you see smoke in the radiator when you start the car. get to a shop and tell them you think you have coolant leaking into your engine or from the exhaust. they will perform a compression and leak down test. everything else you're doing is just a waste of time chasing your own tail

 

I have a video showing how to take out the trans and subframe, the engine can be taken out the top by itself possibly, otherwise take it out the bottom with the subframe and transmission. do your compression and leak down test. don't just start ripping out major parts in your van without a clue as to what you're looking for.