![]() Flushing the coolant on a regular basis removes gunk and mineral deposits from your engine, while prolonging the life of your heater core, thermostat, hoses and water pump. If you spill coolant when you flush your Forester, be sure to put down cat litter to soak it up to discard it. The video above shows you where the petcock on your radiator is located, how to flush the coolant / antifreeze and how to burp the system to get the air out of your Forester.Ĭoolant is toxic and animals are attracted to the sweet taste of coolant (antifreeze). When you flush your coolant, which is antifreeze, on your 2003, you are draining out all of the old dirty coolant and preventing costly radiator and cooling system repair down the road. Like the oil in your Forester, coolant gets dirty over time and loses its ability to cool down your 2.5 liter engine. ![]() Turn off the engine and drain the water, fill up the radiator with antifreeze until you have a 50/50 coolant / distilled water mixture and burp the system. ![]() Fill up the radiator with distilled water and run the engine. This video shows where the radiator drain plug (petcock) is located on a 2003 Subaru Forester. It warns that if I use non-Honda coolant, it can result in corrosion causing the cooling system to malfunction or fail. It also said that I can temporarily use a major-brand non-silicate high quality coolant for aluminium engines. Start your coolant flush by draining the coolant / antifreeze that is in your reservoir, then drain the coolant that is in your radiator by opening the petcock or removing the lower radiator hose. The manual says the above is a premix of 50/50 antifreeze and water. In addition to preventing your car from overheating, coolant / antifreeze also helps lubricate the seals in the water pump and hoses. Note: If the ports are not labelled, try connecting the recharge kit to both unlabeled ports on the AC hoses. Remove the cap from the low pressure service port labelled L, and connect the AC recharge kit. Coolant / antifreeze also passes through the heater core under your cowl to provide heat to the cabin of your Forester. Turn on the AC and set it to the coldest setting, and the fan speed to maximum. Coolant / antifreeze circulates through Forester radiator and engine to maintain the proper temperature. Learn how to flush the coolant (antifreeze) in your 2003 Subaru Forester. ![]()
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