The man tried to drive through Walcot Lane ford, in Pershore, on Saturday morning, the ambulance service said.
"The elderly man driving had managed to get himself out of the vehicle and was treated at the scene by medics for being cold and wet," a spokesman said.
He said the man was "extremely fortunate" he escaped quickly and urged other drivers to avoid flooded roads.
Fire crews helped rescue the man and his vehicle.
Several flood alerts are in place in Worcestershire. But previous flood warnings, which urge for immediate action as flooding is expected, have been lifted.

But on closer inspection, it turns out the Barcelona striker has not swapped La Liga for the League of Ireland.
It is in fact 16-year-old Barry Cotter, who bears an uncanny resemblance to the Brazil World Cup star.
While Neymar will line-up in the Champions League, former Avenue United and Ennis Town forward Cotter will play in the under-17 National League after signing for Limerick.
But he shares his doppelganger's confidence telling the club website: "I'm looking to score at least one or two goals in each game for the rest of the season."
A driver was taken to hospital after his car became "completely submerged" in a ford.
[NEXT_CONCEPT]
On first glance it looks like Limerick have pulled off the transfer of the century and signed Barcelona striker Neymar.