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Coolant does not return from overflow tank back to radiator

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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stormbrewin
  • 426 Answers

SOURCE: Coolant filling up overflow bottle

You may need to ask AAA to put a radiator pressure tester on the resevoir bottle and pump it up to operating pressure(Pressure cap rating) and see if it over pressurises while it is running at operating temp,rev engine up and down and watch what the testers pressure readings do,it should move up and down in sync with the water pump.If the pressure keeps building i would have to believe that combustion chamber gases are over pressurising your cooling system.Also test the pressure cap is functioning within factory specs.

Posted on Oct 30, 2008

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csmock132
  • 4669 Answers

SOURCE: Low Coolant light flashing on 1996 Buick Regal 3.8

The low coolant sensor should be located in the passenger side radiator tank, You need to take it out and clean the sludge off of it for it to work right. Or you can just unplug it and forget about it, the light will go out and it won't cause any problems.

Posted on Mar 01, 2009

  • 3 Answers

SOURCE: pajero diesel 2800 radiator coolant overflows, engine temp. up

REMOVE RAD CAP AND RUN ENGINE AT 3000RPM WITH ALL HEATERS ON SOUNDS LIKE AIR LOCK, ALSO CHECK IF HOSES ARE HOT

Posted on Mar 30, 2009

Sergey2121
  • 46 Answers

SOURCE: radiator coolant or reservoir tank always full

Relax, there is no problem.

When the water / coolant gets hot (inside of radiator/engine) it starts to boil, ofcourse when it boils, it expands, so the fluid in the radiator has to go somewhere, thats why there is the overflow reservoir. So, when the fluid boils, some moves to the reservoir to avoid any potential problems with the radiator, such as it blowing up, or not being able to cool off all of the fluid running through the engine.

But relax, its normal.

Posted on Jul 13, 2009

  • 12 Answers

SOURCE: Overheating Fiero

well fieros are very different cars you need to fill collent in a speical way so air doesnt get in the lines most fiero owners do not know this but it very important The best way to tell it is for wikipedia
Cooling system issues
With an already hot normal operating temperature of 220 °F (104 °C) prior to the recall switching to a 195 °F (91 °C) thermostat, the mid-mounted engine utilized long pipes to carry coolant to the front-mounted radiator. This demanded that a special coolant filling procedure be followed to prevent severe overheating. Simply pouring coolant into the thermostat housing (on the engine) would leave an air bubble in the radiator, while adding coolant just to the radiator would leave an air bubble in the engine's coolant passages. Proper procedure (with engine idling and the thermostat removed, filling the thermostat housing, burping the bubble out of the radiator by cracking open the radiator cap until coolant exits) must be followed in order to ensure an air-free cooling system.
A second problem has become common as more Fieros are being serviced by shops unfamiliar with their design. The under-body coolant tubes are positioned in such a way that a casual glance beneath the car will not suggest their fragility. As a result, many have been crushed by shop lifts, resulting in a near complete lack of engine cooling. The age of the car means that even GM dealerships may now be unaware of the proper jacking methods.
Lastly, the absence of a spare tire (at the front of the car, right behind the radiator) could have an effect on coolant system performance. i dont know who wrote this and i dont take credit for it

Posted on Nov 19, 2009

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1 Answer

Overflow to water container not functioning model no 2650


This expansion tank is only when coolant builds up so musch temperature and pressure that it needs to release, so it relieves itself from the radiator into the expansion tank.
Then, when coolant returns back to normal operating temperature, the pressurized air contracts, forming a negative pressure or vacuum, sucking the now-cooler coolant mix back in to the radiator and cooling system.
So if your water is not getting to the bottle at all, even when engine is boiling, check the outlet and overflow line for blockages, the stem-valve in the bottle is moving, pressure/water leaks in the cooling system venting water or steam.
Also check radiator cap is correct for the car model and operating.

Nov 20, 2017 | Cars & Trucks

1 Answer

Why is it that overflow tank is full, while radiator is low on coolant; coolant in tank not flowing back into the radiator?


You have a coolant leak. The engine gets hot and pushes coolant out under pressure into the overflow tank.When it cools, the volume of coolant decreases, the pressure drops to the point that it becomes a vacuum. The vacuum pulls in air more easily than coolant. It's thinner. So, you keep losing coolant from the radiator which makes the engine run hotter, each time until it eventually overheats and does damage. You need to have the cooling system pressure tested. The leak will show up. Usually, it's a loose hose clamp or cracked radiator tank high up, which makes it had to see the coolant because it doesn't leak much and it boils off leaving little or no evidence. Fill the system completely before pressure testing. Remember, checking the overflow tank means nothing when checking coolant level. There's no short-cut to checking the coolant level, take the radiator cap off when cold to accurately check level. Read the safety precautions on the car but always check when the engine is cold. NEVER HOT.

Nov 01, 2017 | Cars & Trucks

1 Answer

The overflow need to be filled with water?


Yes, it is important to include the overflow tank or bottle as integral with the radiator and coolant system as a whole. They all intermix. Actually, the level in the overflow tank is a true measure of the correct amount to keep your coolant at. There are two marks on the overflow: full hot and full cold. The coolant system on all modern cars is a sealed system and therefore should never require adding, save a very small amount through evaporation within the overflow tank- the only part that is open to atmosphere.

So once you get all the air out of the system that is possible, both in the engine and in the radiator, you have a full level everywhere, including the overflow tank where it should always remain somewhere between the full hot and full cold marks.

You are right that the overflow collects the heated radiator coolant. But it is due to the expansive properties of coolant-or water- that it expands when heated, (but not boiling-that is very bad news of a different sort). Your radiator cap is designed to open at a specific pressure, just enough to allow coolant to flow into the overflow. As the engine and coolant cools, it contracts, the level drops in the radiator, and a natural vacuum there will siphon the overflow tank back into the radiator until it is full again. That is why you have the full hot and full cold marks.
I will shut off the lecture now. I hope you have liked my answer. If not, I give you permission to kill me now- if I may so jest.

Mar 06, 2015 | 1992 Toyota Corolla

2 Answers

Can a water pump make water to return to the water bottle


If the engine overheats from a thermostat
stuck closed or bad head gasket

Aug 10, 2013 | Cars & Trucks

1 Answer

I was checking my toyota celica's coolant and it look empty, until i opened a second cap on the bottle, why?


Coolant flows to the overflow tank (white plastic tank- not to be confused with the washer fluid resevoir) when it is hot, then gets sucked back into the radiator when needed. In theory, you should never need to open the radiator itself. Just make sure the overflow tank is full to the cold line if your engine is cold, and full to the hot line if it the engine is hot. If you recently drove your car, the level will gradually change in that overflow tank (as coolant is forced out of the radiator and eventually sucked back in. Unless it is completely empty, you shouldn't need to add much.

Sep 14, 2011 | Toyota Celica Cars & Trucks

2 Answers

Hello my 1994 camry toyota has a problem holding the water. We replaced the thermostat,fan switch,radiator cap, and it keeps comsuming the water. What do you think the problem might be? Javier


Javier, have you checked the coolant overflow tank for holes, cracks, or loose hose? When the engine in your car heats up, the coolant expands. The coolant overflow tank (located near the radiator) takes up any coolant that is forced out of the radiator. If the tank is damaged or not connected to the radiator correctly, the coolant will not siphon back into the cooling system when the engine cools off.

Dec 07, 2010 | 1994 Toyota Camry

2 Answers

I own a 1985 300zx Turbo?.I like to know why my


Your overflow tank works on suction to return coolant to the radiator. Check the line and nipple ends for any cracking (cracking on the plastic radiator nippl is very commom). The radiator nipple is not under high prrssure like the fluid under the cap (inside the coolant system). It's on the otherside of the cap and will never "stream or gush" coolant (uless you are over heating badly). As the coolant in the radiator cools it creates a vacuum and draws coolant back from the overflow throgh a small hose. You might not see any leaks as coolant heats up and travels to the overflow. It might be a very small leak and you are usaully driving around and drying up before you see it. Even with a very small crack it will only draw in air and not liquid (as liquid is way heavier than air). Also, I've seen where people have taken out (or fallen out) the tube attached to the overflow cap that goes down deep into the overflow tank. That tube should be long enough to almost reach the bottom of the tank. It's hard to know if something is missing if you do not know it was suppose to be there in th first place but it needs to be there.

Jul 04, 2010 | 1985 Nissan 300ZX

1 Answer

Cooling system over flow system. and how it works


The overflow system has a different radiator cap than on yesteryears cars. The old cap would let extra water vent out of the radiator and you would lose that coolant. The newer radiator cap lets water go both ways through the vent tube. Then the overflow uses a tank to catch and return the water. It siphons the fluid back into the radiator.

The system was invented when the thermostats were set at 205degrees and up for pollution systems. It also saved some aluminum with smaller radiators and using a plastic overflow bottle instead of a bigger metal radiator.

Oct 22, 2009 | 2000 Ford Taurus

2 Answers

Leaking Anti Freeze on a Dodge Neon 1999


i had the same problem until i changed my water pump,so you might want to get that checked out

Nov 15, 2008 | 1999 Dodge Neon

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