Hold up. There is a part called a BLOWER RESISTOR which is typically the culprit. Usually lives behind the blower fan.
Dealer-only part for around $25, or hit the local junkyards.

www.car-part.com

Also, a quick-n-dirty check on clogs in the radiator. Run vehicle up to operating temp. Shut off. Lightly touch fingers to radiator fins. Cool spots are clogs.

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