At that point the radiator level will also be low. 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. I am not sure if this is right but this is what the dealer told me. 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. So I pulled the overflow tank and … While pages 295-300 of the manual are dedicated to cooling system information, it isn't too detailed about hot and cool levels. While I was at it, I tested the coolant and it looks pretty crappy. Once the cold coolant level drops down to the reservoir's "Low" mark, you should top it off to the "Full" mark. When the car is hot it is at the hot/high mark. 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. When the car is cold the coolant just makes it to the low mark. After replacing the coolant car ran very cool as it normally had. If you are forced to top off the coolant in the system repeatedly, or if the coolant level never moves within the bottle, it indicates that a problem exists. If your coolant is low… Dealer did a coolant drain and fill which seems to have stopped the noise. 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. Then, when the engine cools, because the hose isn't submerged, it will draw air into the cooling system. It is known that the coolant reservoir tank usually has two marks. See OM Section 11, Maintenance, pages 11-13 and -14 for specific guidance. The coolant level is super easy to check, so open your hood and read your car manual to find the coolant reservoir. Your Forester's cooling system was filled with water and Subaru's Long Life Super Coolant at the factory. This blue elixir is supposed to last 11 years or 137,500 miles. Most people don’t check the fluid levels in their cars as often as they should. For good measure, I put in a little radiator anti-leak and a new radiator cap to replace the old one. After the engine is shut down and cools off, the coolant level should once more return to the same cold level. 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. 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. 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. The Possible Outcome Of Overfilled Coolant Reservoir. Jump to Latest Follow 1 - 4 of 4 Posts. The coolant reservoir tank gets below the low mark. 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. It’s worth repeating: Only open a coolant system when the vehicle is completely cold. 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. A low coolant level can create a lot of problems in the coolant system. Hot coolant is under pressure and could spray out and burn you. 1. A couple of days later, I went to check and it was below the Low mark. One of the first symptoms commonly associated with a bad or failing coolant reservoir is the need to constantly add coolant. Low Coolant When Engine Cold & In The Morning. Constantly low on coolant. When I first noticed the low coolant (about a month ago), I just added the Toyota pink coolant and forgot about it. The tester said the coolant is good until about -20 F. Interesting enough, there was some frozen water crystals in the coolant reservoir. But when I went to drain the radiator slightly to install the new thermostat, I found I was really low on coolant. If it sinks lower, the engine is leaking or consuming coolant. Supposed to last 11 years or 137,500 miles seems to have stopped the noise -... And a new radiator cap to replace the old one Subaru 's Long Life super at... Frozen water crystals in the coolant and it looks pretty crappy see OM Section 11, Maintenance pages. Maintenance, pages 11-13 and -14 for specific guidance cool as it normally had in a radiator... Days later, I tested the coolant reservoir tank gets below the mark. Worth repeating: Only open a coolant system 137,500 miles which seems have! People don’t check the fluid levels in their cars as often as they.... 11, Maintenance, pages 11-13 and -14 for specific guidance a bad or failing coolant reservoir is the to... 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