Well, the 5 year old would be dangerously wrong.
Absence of steam does not denote 'not too hot to handle with bare hands'.
Diesel boils somewhere between 320F and 700F.
Ouch!
"Give me your tires, your plastic,
Your 20 ton masses yearning to be cracked,
The wretched refuse of your 7-Eleven stores.
Send these, the oxygenless, trashcan-tost to me,
I lift my secret catalyst beside the P2O feedbin door!"