I have a 70 442 A/C with no high speed on the blower but the lower speeds work.. New relay installed with no help. Any ideas?
Thanks

 

There’s an inline fuse for the high speed fan power supply. Look along the passengers side of the firewall (I think).

 

There should be a 30 amp inline fuse between the junction block and the blower resistor. It's in a weird little weatherproof rubber holder which you'll probably destroy trying to get it open to check the fuse.

This is one of those things where originality bedamned. I usually replace them with either a glass tube fuse holder or sometimes a blade fuse holder.

 

Thanks Guys for the info,greatly appreciated. We put new under hood harness's on the car and probably overlooked that.