Coolant Reservoir is empty! The leaks may be small enough that they may not be obvious to the driver, however, over time they will cause the reservoir to empty out. There is also definite vacuum leak in the brake booster (hissing in the cabin under the brake pedal) and a sound of air blowing coming from near the drive belt. Found the tank on the front right of the engine and the thing was near totally empty maybe 1/2 an inch of coolant at the bottom if that! Dripped out straight down left side of radiator and the drip point was near the flush valve at bottom. Loss of the liquid can lead to the overheated condition but overheating can also contribute to the coolant loss. The coolant will then contract instead of expand; resulting in the volume of the coolant decreasing. This has happened 3 times now. Reservoir was empty. This is kind of like a vacuum effect where the pressure decrease allows the excess coolant in the overflow tank to flow back out of it, so it can return to the radiator. I discovered that each time I fill the coolant reservoir with coolant and drive the car, by my next stop the coolant reservoir will be completely empty. Why is my coolant overflow not draining back into the radiator? Coolant reservoir seems to always constantly be empty (ie: I should be filling it up everyday after I drive it up to 50 or so miles a day for work in stop and go traffic). Gurgling noise is heard, and it seems as if it's inside the cabin, behind the dash (possibly in heater core) but I cannot see any symptoms of leaks either inside or outside/underneath the cabin, and suspect the noise is simply from air having gotten into the system … The constant need to add coolant can also be caused by a leak somewhere else on the engine so a proper diagnosis is recommended. No spray anywhere. i dont remember the last time i filled it up, but i do know there is a low-coolant light by the gauges, and i thought that would alert me when the coolant got low. No hoses cracked and does not appear to be an cracks in radiator. Why is my coolant reservoir always empty and I keep filing it up and it runs out...I see no leaks under car...radiator seems full ...I put who anti freeze colant 50 / 50 in the colant reservoir and radiator ..I don't know whats wrong...suggestions. i was recently checking all the fluids in my car, and i noticed that the coolant overflow was completely empty . By Steve D'Antonio. Engine overheating and coolant are closely related to each other. Top 4 Bad Coolant Expansion Tank … Submitted: 10 years ago. Car has ran fine for 2 week around town & short distances only. Added coolant, heat came back on & the car made it 20 miles back to the house without overheating. The coolant recovery bottle acts as a reservoir for the engine’s cooling system. Overheated today. Used B.D. What could be the problem? WTH is that normal? Coolant leaks. 2. Just fill up the tank to the maximum limit and keep an eye on the engine condition and the rate of coolant usage. Coolant reservoir goes empty over the course of several weeks (don't recall how many). I can't see water leaking or dripping from anywhere in the car. For the past few days I have checked it regularly and the radiator itself has been full everytime and the car has not been running hot. The coolant was so low I couldn't see it and the reservoir was empty too. I am stumped I am thinking thermostat failing, but no overheat, temp guage good, no indication of problem. I filled the coolant all the way up and let it continue to run and over a couple of days continued to put coolant in it. 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