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.
1981 Chevrolet Step Van P30, 5.7L Eng VIN M, Standard TransFACTORY OEM SERVICE PROCEDURE
Engine Performance And Maintenance: Coolant
| Condition | Code | Procedure |
|---|---|---|
| Acidity (pH) incorrect | 1 | Suggest correction or replacement |
| At or beyond service interval | 3 | Suggest replacement |
|
NOTE:
The system should be drained and/ or flushed and refilled with correct coolant according to OEM recommended service interval and procedures.
|
||
| Contaminated | B | Require replacement or recycling Further inspection required |
|
NOTE:
Determine source of contamination and require correction prior to coolant replacement.
|
||
| Fluid discolored | No service Suggested or Required | |
|
NOTE:
Further testing necessary to determine condition of fluid.
|
||
| Level incorrect | B | Require correction of fluid level |
|
NOTE:
Determine source of incorrect level and suggest repair.
|
||
| Mixture incorrect | B | Require correction or replacement |
| Type incorrect | B | Require replacement |
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.
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