Log in to your account online to make a payment, check your loan balance and more. Our Loan Servicing team is always happy to assist you.Salt Lake City, UT 84170. When are my mortgage payments due? This form is for existing Westlake Black Visa Credit Card account holders only. Please do not use this form for questions related to a Westlake Auto Loan. Salt Lake City, UT 84165-0250. The process should take a minimum of 30 days to complete. I paid off my car loan. The lienholder sent me the title and signed the request for lien change section.