Automobile dealerships often perform warranty or guarantee work for the company whose cars they sell. You should write a letter of complaint if you bought your car from a dealership and you are unhappy with the service, the repairs or with any facet of your experience with the dealership. A polite, but firm letter of complaint that clearly describes your experience will help the dealership resolve your problem.

Prepare to write your service complaint to the dealership by reviewing your warranty or guarantee documents. Find the provisions in the warranty or dealer guarantee that cover your particular complaint to the car dealership. Make sure your warranty has not expired and the problem is covered by your warranty or guarantee.

Open the word processor program on your computer. Open a new document and type the date at the top of the page. Type your full name, address, city, state and ZIP code. Add your contact information such as telephone, cell and email beneath your address. Press "Enter" three times.

Type the name of the dealership followed by the dealership address. Add an "Attention" line after the address and type the name of the person to whom you are sending your complaint. Press "Enter" two times.

Type the abbreviation "RE:" (regarding) and then describe your vehicle including the VIN number. Describe the problem with the vehicle and the date the problem first manifested. List the dates that work was performed to try to correct the problem. Include the names of mechanics or others with whom you had discussions about your vehicle if you know their names.

Type your salutation, "Dear Sir or Madam" or type the person's name if you know it. Describe in detail exactly what you want the dealership to do about your problem. Explain to the dealership that you expect a representative of the company to contact you immediately regarding your problem.

Close your letter by thanking the reader for their time and attention. Type "Sincerely," and press "Enter" four times. Type your full name and press "Enter" two times. Type the word "Attached" or "Enclosures." Press "Enter" one time and then type a list of documents that you attached to the complaint letter.

Print your complaint on letter size paper. Print the envelope. Make a copy of your letter. Fold the original letter with all relevant documents attached. Affix postage and mail your letter to the dealership.