How to Troubleshoot the Cooling System in a GMC Sierra

Iskandar Blogger 8:19 AM

One of the first steps to identify challenges with your cooling system is to know how it functions. In short, coolant picks up heat in the engine and releases heat as it passes through the radiator. The cooling devices circulate antifreeze, contain it or control its temperature. Troubleshoot the cooling system in a GMC Sierra by routinely checking cooling system devices.

Instructions

    1

    Check the water pump for leaks. Your water pump pushes coolant through the engine, radiator and heater core. Signs of a faulty water pump include a faint antifreeze smell or spots of coolant under your Sierra when parked for short time frames.

    2

    Examine your hoses for damage from cracks, collapses, leaks or dryness. Inspect upper and lower radiator hoses, heater and bypass hoses and manifold coolant hoses. For example, the upper hoses measure about 2 inches wide and carry coolant between the radiator and engine. Worn hoses lead to cooling system problems.

    3

    Monitor the antifreeze level. Low antifreeze results in overheating and other cooling problems. With low levels, add DEX-COOL extended life coolant to the expansion tank reservoir. This pertains to the VORTEC 4300 V6, VORTEC 5300 V8 and VORTEC 8100 V8 engines.

    4

    Explore cooling problems by draining coolant and flushing the system. Drain antifreeze properly and dispose of it safely. Coolant's sweet smell attracts animals and small children and ingesting the toxic liquid can be fatal.

    5

    Inspect the radiator cap for signs of damage. A faulty cap could reveal corrosion. Contact a mechanic to use a pressure tester or an adapter to inspect the cap's pressure rating and functioning. Replace a defective cap promptly.

    6

    Wash and gently scrub the front of your radiator. When you drive, dirt, rocks, leaves and other debris suck into the fins of your radiator trapping heat. Use a soft nylon brush, soapy water and a water hose to clean your radiator front.

    7

    Determine if the thermostat is sticking. Constant low temperature readings or peaks between high and normal temperatures indicate a stuck thermostat. The thermostat usually sits inside the housing on the engine side of the upper radiator hose.