No hoses cracked and does not appear to be an cracks in radiator. Car has ran fine for 2 week around town & short distances only. By Steve D'Antonio. head gasket sealer product, flushed coolant, & replaced thermostat. I am stumped I am thinking thermostat failing, but no overheat, temp guage good, no indication of problem. 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. Why is my coolant overflow not draining back into the radiator? Added coolant, heat came back on & the car made it 20 miles back to the house without overheating. This has happened 3 times now. What could be the problem? Overheated today. 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. 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). The coolant recovery bottle acts as a reservoir for the engine’s cooling system. 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. The constant need to add coolant can also be caused by a leak somewhere else on the engine so a proper diagnosis is recommended. Used B.D. Top 4 Bad Coolant Expansion Tank … 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. 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. Updated: April 20, 2020. You may not fully comprehend its significance, but the coolant recovery tank is the unsung hero of the engine compartment. The coolant will then contract instead of expand; resulting in the volume of the coolant decreasing. No spray anywhere. Engine overheating and coolant are closely related to each other. Category: Dodge. Coolant Reservoir is empty! Coolant leaks. 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 … 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. i was recently checking all the fluids in my car, and i noticed that the coolant overflow was completely empty . WTH is that normal? 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). Loss of the liquid can lead to the overheated condition but overheating can also contribute to the coolant loss. Reservoir was empty. It … Submitted: 10 years ago. 2005 4 Cylinder SE with about 155K. 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. 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. 2. The coolant was so low I couldn't see it and the reservoir was empty too. First a little clarification about your statement; the coolant does not drain back into the radiator, it is drawn in when the radiator cools and creates a low pressure in the system. 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