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every AC truck Ive ever driven from 73-87 (there have been quite a few) have worked this way stock. If you goto the dealer to get a replacement switch, its an updated design (vs. the mid 70's anyway) and you have to change a little bit of wiring slightly.. its a no brainer (the installation/mod) but after the mod- it works to where max AC is not always on HIGH.... So if the switch has ever been replaced, it will work like you say. But if the system is the same as what rolled off the assembly line, max AC will be high fan only.
Dont think any of the blazer/burbs ive driven had a working AC so I never tried.. I have a 91 burb, Ill check it out next time I drive it.. Im 95% sure that max AC =high fan only in the '91...
pc
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