Constantly low on coolant. I brought the car to the dealer to have them top off the resevoir and they told me that as long as the coolant is at the low mark when cold it is ok. It’s a sealed system so there’s rarely any need to top up the coolant level, which you do when the engine is cold and by unscrewing the filler cap on the reservoir. The coolant level is super easy to check, so open your hood and read your car manual to find the coolant reservoir. One of the first symptoms commonly associated with a bad or failing coolant reservoir is the need to constantly add coolant. I am not sure if this is right but this is what the dealer told me. If your coolant is low… If there is a leak, then coolant that is moved from the engine to the reservoir when the engine heats up might be lost from the reservoir while driving, and not be seen as a leak on the ground. The coolant reservoir tank gets below the low mark. When I first noticed the low coolant (about a month ago), I just added the Toyota pink coolant and forgot about it. A low coolant level may create air pockets in the coolant system and may be causing the water pump to stay in an air pocket. Dealer did a coolant drain and fill which seems to have stopped the noise. 1. While I was at it, I tested the coolant and it looks pretty crappy. But when I went to drain the radiator slightly to install the new thermostat, I found I was really low on coolant. Had an overheating problem a few days ago, assumed it was the thermostat because when I looked at the radiator overflow tank, it was at the "Hot" level. It’s worth repeating: Only open a coolant system when the vehicle is completely cold. Your Forester's cooling system was filled with water and Subaru's Long Life Super Coolant at the factory. If it sinks lower, the engine is leaking or consuming coolant. While pages 295-300 of the manual are dedicated to cooling system information, it isn't too detailed about hot and cool levels. After the engine is shut down and cools off, the coolant level should once more return to the same cold level. See OM Section 11, Maintenance, pages 11-13 and -14 for specific guidance. At that point the radiator level will also be low. Then, when the engine cools, because the hose isn't submerged, it will draw air into the cooling system. Once the cold coolant level drops down to the reservoir's "Low" mark, you should top it off to the "Full" mark. It is known that the coolant reservoir tank usually has two marks. The Possible Outcome Of Overfilled Coolant Reservoir. Especially if a car is a newer model, most people just assume everything’s OK, or that a light will show up on the dashb I did notice when cold the coolant level seems kind of high. Most people don’t check the fluid levels in their cars as often as they should. If the reservoir cracks or develops any small leaks it can cause the coolant it is storing to leak or evaporate at a slow rate. Check the level markings on the side of the reservoir and if there is fall in the level, check the cooling system hoses for leaks. One of the marks denotes the coolant in the reservoir when it is hot, and the other indicates the coolant present when it is cold. This blue elixir is supposed to last 11 years or 137,500 miles. After replacing the coolant car ran very cool as it normally had. So I pulled the overflow tank and … Low Coolant When Engine Cold & In The Morning. When the car is cold the coolant just makes it to the low mark. A couple of days later, I went to check and it was below the Low mark. To have stopped the noise cool levels that point the radiator slightly to install new. After replacing the coolant reservoir tank usually has two marks usually has two marks -! For good measure, I found I was really low on coolant too about. 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