How to Troubleshoot the Cooling System in a Subaru Outback

Identify challenges with your cooling system by knowing how it functions. Simply put, coolant gathers heat when it goes through the engine and releases heat as it passes through the radiator. Cooling devices work to circulate antifreeze, contain it or control its temperature. Troubleshoot the cooling system in a Subaru Outback by routinely checking cooling system devices. The following pertains to most model years.

Instructions

1

Inspect 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 Outback when parked for short time frames.

2

Check hoses for damage from cracks, collapses, leaks or dryness. Examine 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 coolant results in overheating and other cooling problems. With low levels, add Genuine Subaru Coolant to the expansion tank reservoir. This goes for both the four-cylinder and six-cylinder engines.

4

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

5

Look at 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 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

Examine the thermostat for sticking. Constant low temperature readings or peaks between high and normal temperatures are some symptoms of a stuck thermostat. The thermostat usually sits inside the housing on the engine side of the upper radiator hose.