车贷还完后，还需要办理以下手续：

贷款结清证明：借款人需要到贷款银行或金融机构，领取贷款结清证明。这个证明将显示贷款已经全部还清，下一步就可以进行车辆解除抵押的手续。

车辆解除抵押：借款人需要携带贷款结清证明和其他相关文件，前往当地车辆管理所进行车辆解除抵押登记。在这个过程中，车辆管理所会对车辆进行核实，确认符合解除抵押的条件后，会给予借款人车辆解除抵押证明。

保险变更手续：在车贷期间，车辆的保险单是抵押给银行的。因此，在车贷还清后，需要到保险公司办理保险变更手续，以便后续车辆的正常使用和维护。

收回相关文件：在车贷还清后，需要将与贷款相关的文件如抵押合同、还款计划表等文件收回。这些文件对于后续的车辆买卖和过户非常重要。

保养和维护：车贷还清后，需要对车辆进行必要的保养和维护，确保车辆性能良好。这包括更换机油、检查刹车系统、更换轮胎等。

英文：

What procedures need to be followed after the car loan is paid off?

After the car loan is fully paid off, the following procedures need to be completed:

Loan payoff证明: The borrower needs to go to the loan bank or financial institution to obtain the loan payoff证明. This证明will show that the loan has been fully paid off, and the next step is to proceed with the vehicle release lien registration.

Vehicle release lien: The borrower needs to bring the loan payoff证明and other relevant documents to the local vehicle management office to conduct vehicle release lien registration. In this process, the vehicle management office will verify the vehicle and confirm that it meets the conditions for release of the lien. After that, the borrower will be given a vehicle release lien certificate.

Insurance change procedures: During the car loan period, the vehicle's insurance policy is pledged to the bank. Therefore, after the car loan is paid off, it is necessary to go to the insurance company to complete the insurance change procedures to facilitate the subsequent normal use and maintenance of the vehicle.

Retrieval of relevant documents: After the car loan is paid off, it is necessary to retrieve documents related to the loan, such as the pledge contract, repayment schedule, etc. These documents are very important for subsequent vehicle sales and transfer of ownership.

Vehicle maintenance: After the car loan is paid off, it is necessary to perform necessary maintenance and repairs on the vehicle to ensure its good performance. This includes changing the oil, checking the brake system, replacing tires, etc.