How to Check for Cooling System Leaks in a Subaru Outback

To keep your Subaru Outback in proper working condition it's important to monitor the coolant levels regularly. If a leak goes undetected, the coolant loss can cause the engine to overheat often resulting in irreparable damage. Checking your coolant system for leaks requires no significant knowledge of auto mechanics and is simple enough that nearly anyone can do it.

Instructions

1

Move the Subaru Outback from its normal parking space and check the area beneath for any signs of leakage. Since coolant is brightly colored, the signs on the ground should be evident.

2

Open the hood and inspect the water pump and the gasket seal for any leaks. The water pump is between the radiator and the engine block, behind the engine fan. The gasket seal connects and seals the water pump to the engine block. Look for any discoloration or corrosion around these auto parts.

3

Inspect all of the cooling system hoses for possible leaks. Check for any bulging, cracking or splitting. Be sure to check where the hoses connect to the radiator, engine and heater core thoroughly. These hoses can also become loose due to engine vibration and cause leakage.

4

Use a flashlight to inspect the Subaru Outback's radiator for signs of leakage. The radiator can suffer damage on its underside due to rocks and road debris making contact during the normal course of operation.

5

Twist the radiator cap one full turn, step away, wait a minute or two and then remove the cap completely. Removing the radiator cap is dangerous because the cooling system contents are under significant pressure. This pressure can cause a coolant eruption, which can severely burn anyone in the area.

6

Fill the radiator with fresh coolant until it's within an inch from overflowing. Turn on the engine and set the heater to high. Let the Subaru Outback run like this for about 15 minutes.

7

Check all the auto parts from the previous steps for leaks. If you still can't find a cooling system leak in the Subaru Outback, it's most likely an internal leak. In which case, it's best to take the auto to a cooling system specialist for further diagnostics.