Yep, either the resistor, easy enough to check. If it is good, pull the control panel out.
The fan switch is notorious for melting itself and it's connector.
97 Sahara, 74 Renegade, 72 CJ5, 55 Willy's (the Beast) Boss 302, 6:34 gearing, Bose 901 speakers.
God I miss that Jeep. Forgot the kinda Jeep, 80 SX4.