There is strip fuse for the blower mounted in a black rectangular box above the driver's side wheel well.
Also check the control voltages. The connector is behind the power steering, under the front window gutter. The yellow wire is the control which should be 1v when blower switch on low, 12v when on high, and in between when on auto.
If all that is OK, short the blue wire on the regulator to ground. The blower should run at high speed while shorted.
My blower only ran on low. The regulators tend to burn out after 120K or so. My blower motor needed a little lubrication, but the problem was the regulator. They list at $300, Fastlane has them at $251, and you can find them used for $100-$125. Good luck.