Ok I got a new relay and replaced the old one I think I swapped out the aux fan relay but I am not sure if I changed the right one the one I changed is the rectangular one of the three on the Passenger side firewall next to the four small fuse holders. the fan still doesn not go in with the AC so the dryer switch is the next thing to change
Please a little help. can someone please let me know if I swapped the correct relay and I have no idea what the dryer switch is and where it is located or where to buy a new one.

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1972 280 SEL