Four trailered show horses dripped sweat and rustled while parked at the downtown Vancouver Chevron station in Sunday afternoon’s heat.A team with the A&T Equestrian Centre from Vancouver, B.C., headed north on Interstate 5 after a show in Philomath, Ore. They traveled nearly 100 miles when they noticed a flat trailer tire at around 2:30 p.m. After exiting the highway and pulling into the busy gas station at 210 E. Mill Plain Blvd., they discovered the tire wouldn’t fill with air.Afternoon temperatures hovered around 90 degrees — higher in the trailer — and relative humidity was around 70 percent, said meteorologist Treena Hartley with the National Weather Service in Portland. Typically, Vancouver’s humidity is in the 30s.Without a breeze, the horses were in danger of overheating. The equestrian team asked gas station attendent Megan Creviston, 22, for some help. She allowed them to park underneath the canopy, helped carry several buckets of water to the horses and sold bags of ice to cool off the horses.“When I had time to go outside, I was checking on them,” Creviston said.The equestrian team ended up unloading the horses into the parking lot, under the shade of the adjacent Block and Olson Glass building. Creviston called a tow truck with Pacific Towing that could pull the 12,000-pound horse trailer.After about two hours, the team and their horses were back on the road, heading home to Canada.Without Creviston’s help, the equestrian team said, their horses might have suffered serious dehydration or died of heat exhaustion.No rain in sight; watch for fireMonday’s high temperature also reached 90 degrees, but the relative humidity had fallen to 42 percent.