High Pressure Regulator (HPR) Coolant Hose Inspection
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Inspect the high pressure regulator (HPR) coolant hoses twice a year (for example, spring and fall). Replace the hoses if they are cracked, swollen, or deteriorated. Inspect all fittings and clamps. Replace the fittings and the clamps if necessary.