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 MANUALSCHEVROLET1986C 10 P/U 2WD V8-350 5.7LREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSLEAK TESTING - REFRIGERANT SYSTEMLEAK TEST - DESCRIPTION
1986 Chevrolet C 10 P/U 2WD V8-350 5.7L
Leak Test - Description
1986 Chevrolet C 10 P/U 2WD V8-350 5.7LSECTION Leak Test - Description
Testing the refrigerant system for leaks is one of the most important phases of troubleshooting. Several types of leak detectors are available that are suitable for detecting A/C system leaks. One or more of the following procedures will prove useful for detecting leaks and checking connections before and after service work has been performed.
Prior to performing any leak test, prepare the vehicle as follows:
1. Attach a suitable gauge manifold to system and observe pressure readings.
2. If little or no pressure is indicated, the system must be partially charged.
3. If gauges indicate pressure, set engine to run at fast idle and operate system at maximum cooling for 10-15 minutes, then stop engine and perform leak tests.
Prior to performing any leak test, prepare the vehicle as follows:
1. Attach a suitable gauge manifold to system and observe pressure readings.
2. If little or no pressure is indicated, the system must be partially charged.
3. If gauges indicate pressure, set engine to run at fast idle and operate system at maximum cooling for 10-15 minutes, then stop engine and perform leak tests.
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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.