[1967-Landau]

There's no 'relay' for the blower motor, but there is a resistor, which is probably what you are referring to. It's mounted on front of the climate case cover, it's a red thing with a 3-prong connector.

These do go bad, and are often the culprit if you have no blower motor or no speeds. Turn your blower motor on and check for power at the connector for the underhood resistor. If you have power and no blower motor, you either have a bad resistor or bad motor.

To test your motor, you'll have to get under the passenger side dash and jump power directly to the blower and see if you get any motor action.

If the latter is the case, I will forewarn you, pulling and replacing the blower motor is a bear. Despite what the shop manual says, you're probably going to have to pull the hood off, and passenger-side hood hinge, and at least the inner fender just to get access to pull the right side of the climate case off. But what you will most likely find there is that the old motor is rusted to the firewall (water condensation from the evaporator core.) Just think ahead...fix all of it while you are in there cause you never want to have to go back in there to fix it again.

Good Luck.