In -28c, I wouldn't work neither
Maybe they did work but you just didn't feel them. They take a while to warm up when running at speed. When you stop and let it idle, the power to them drops to almost nothing as they are controlled via PWM by the ECU.
Other than that, you can check their resistances. The connectors are just down the bar on each side.
View attachment 177481
Also check your main ground block for melted connectors and wires. It's taped in the harness just behind the fan. There is a bulletin and fix for this issue which is also avalable to VIP members.
If you don't have a copy of the repair manual, if you become a VIP member, you can get a copy of it from the VIP area.