Originally Posted by
Burntboot
B5c - Codes 10 and 11 have been covered extensively, please try the search function
Running an engine without coolant is a horrible idea and will do extensive damage in VERY short order.
Having actually driven it (no coolant AND under load) doesn't bode well.
Poor running can be caused by a multitude of things but if the exhaust (on start up) looks like your van has a vaping habit, that would be considered definitive proof of head gasket damage, as would checking coolant for hydrocarbons.
IF it is leaking coolant into the cylinders time is of the essence as rust will form in short order and piston rings will not forgive that insult.
Its the sort of repair that needs to be addressed soonest, not ignored till better wether arrives.
With luck, the head gasket will have taken the brunt of the abuse, but close inspection of cylinder head would be warranted too.