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 MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 352 (ENGINE COOLING SYSTEM)GENERAL DESCRIPTIONTESTING THE PRESSURE CAP
1999 GMC Forward Control 5.7 R, Automatic
Testing The Pressure Cap
1999 GMC Forward Control 5.7 R, AutomaticSECTION Testing The Pressure Cap
WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
TOOLS REQUIRED:
- J42401 Surge Tank Cap Tester
CAUTION:
DO NOT REMOVE PRESSURE CAP FROM A HOT SYSTEM. ALLOW THE SYSTEM TO COOL, THEN SLOWLY REMOVE PRESSURE CAP.
- Remove the pressure cap from the coolant surge tank.
- Make sure that all parts of the pressure cap, tester, and adapter are clean.
- Wet the rubber gasket of the pressure cap with water and install Surge Tank Cap Tester J42401-1 to cap.
RENDER: 1.0x
NO RELATED
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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.