1981 Chevrolet Step Van P30, 5.7L Eng VIN M, Standard TransFACTORY OEM SERVICE PROCEDURE

Anti-Freeze Concentration

Test anti-freeze concentration using a suitable anti-freeze tester. The tester should have a temperature compensating feature, as failing to take temperature into consideration could cause an error as large as 30Β° F in freeze or overheating protection. Follow manufacturer's instructions for correct use of tester.

Fig 1: Pressure Testing Cooling System
G09330561Courtesy of GENERAL MOTORS COMPANY
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:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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