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.
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HOMESERVICE MANUALSCHEVROLET1985FORWARD CONTROL 6.2 J, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALENGINE COOLING FANCOOLING SYSTEM MAINTENANCETESTINGPRESSURE TESTING COOLING SYSTEM
1985 Chevrolet Forward Control 6.2 J, Standard
Pressure Testing Cooling System
1985 Chevrolet Forward Control 6.2 J, StandardSECTION Pressure Testing Cooling System
- With engine stopped, wipe radiator filler neck seat clean. Fill radiator to correct level. Attach cooling system tester to radiator and pump until pressure is at upper level of radiator rating. If pressure drops, inspect for external leaks. If no external leaks are evident, start engine and run with tester attached.NOTE: Pressure may build up quickly. Release any pressure above limit of pressure cap specifications or cooling system damage may result.
- Extremely rapid build-up of pressure may indicate combustion leak into cooling system. Check for water at tailpipe. Excessive water could indicate faulty head gasket, cracked block or cylinder head near exhaust ports. Remove oil dipstick and check for water droplets in oil. If water is evident, serious internal leak is indicated.
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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.