Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1991 Cadillac Seville BaseFACTORY OEM SERVICE PROCEDURE
VIN Definition
There are 17 characters in the Vehicle Identification Number (VIN). The following is a breakdown of the VIN by sequential number as per it's position:
VIN DEFINITION
| Position | Definition |
|---|---|
| 1 | Indicates Nation of Origin. |
| 2 | Indicates Manufacturer. |
| 3 | Indicates Vehicle Division. |
| 4 | Indicates Carline Body Code. |
| 5 | Indicates Carline/Series. |
| 6 | Indicates Body Type. |
| 7 | Indicates Restraint System. |
| 8 | Indicates Engine Code. |
| 9 | Indicates Check Digit. |
| 10 | Indicates Model Year. |
| 11 | Indicates Assembly Plant. |
| 12-17 | Indicate Plant Sequential Number. |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.