Do an ohm meter test on the coils before purchasing it, if they carry current, it isn't the problem. There is another switch mounted to the backside of the control panel that is involved in the extra speeds and the relay that Bill has pictured is part of the A/C only blower speed control too.
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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