Do I need to make an appointment to change my driver's license at the DMV?

No need to make an appointment.

The "Regulations on the Application and Use of Motor Vehicle Driving License" has corresponding provisions:

Fifty-seventh motor vehicle drivers shall, within 90 days before the expiration of the motor vehicle driving license, apply to the motor vehicle management office at or outside the place where the motor vehicle driving license is issued. An application form shall be filled in when applying, and the following documents and vouchers shall be submitted:

(a) the identity certificate of the motor vehicle driver;

(2) Motor vehicle driving license;

(3) A certificate of physical condition issued by a medical institution at or above the county level or at the regiment level.

Extended data:

Provisions on the application and use of motor vehicle driving license:

Article 104 If a motor vehicle driver commits one of the following acts and no other motor vehicle driver immediately takes the place of driving, the traffic administrative department of the public security organ may, in addition to punishing him according to law, move the motor vehicle he is driving to a place that does not obstruct traffic or park it at a place designated by the relevant department:

1, unable to show my valid driver's license;

2. Driving a motor vehicle is inconsistent with the quasi-driving type specified in the driver's license;

3. Drinking alcohol, taking psychotropic drugs or narcotic drugs under state control, suffering from diseases that hinder safe driving, or continuing driving due to excessive fatigue; Learn to drive without the guidance of a coach.

Baidu Encyclopedia-Provisions on the Application and Use of Motor Vehicle Driving License