Why would a pink odorless liquid leak from a football shaped plate on the front of the passenger-side front of the engine block on a 2004 Sienna van?

Answer 1

I sure sounds like a coolant leak at the block heater plate. If you are looking up at the engine and it is about 3" left of the oil filter that's what is it. In extremely cold climates this port is were the block heater attaches, in most places it is just a bolted on plate with an RTV silicon material for gasketing. Here is great link on the subject:

http://www.toyotanation.com/forum/274-2nd-generation-2004-2010/330995-coolant-leak-plate-block-heater-2004-a.html