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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

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

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

tepfy
  • 319 Answers

SOURCE: coolant overflowing from reservior tank

I would really recamend getting a lawyer, and finding out what rights you have in your state. If you can prove all the stuff you claim, this is gross negligence. A mechanic is suposed to be able to put everything back the way they found it. I am thinking they didn't even change your heater core, and just charged you for one. Did you request to see the old one the box the new one came in and the reciept they paid for the heater core. I would have the thermostat checked also.

It sounds like you need a complete power flush witch you can do your self at home but you need to check with a lawyer and a real mechanic first on the problems you may have gained from your first "mechanic"

Tepfy

Posted on May 01, 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

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1 Answer

What cause lower radiator hose to collapse after cool down


Hi Larry:
Good observation. Not too many people would spot that.
When the engine is hot, the coolant is hot and expands. At the filler cap for the radiator, there will be a hose that goes to the overflow tank. As the coolant fluid expands, it flows through thie tube into the overflow tank.
When the engine is turned off, as it cools, the volume of coolant in the engine and radiator contracts, and is supposed to suck fluid back from the overflow tank.
I'm suspicious that something is preventing this from happening so the vacuum in the engine coolant system is collapsing the hose.
WHAT TO DO?
- Check the radiator cap. Make sure it is functioning correctly. Make sure that it is correctly installed and screwed all the way on.
- Check the coolant overflow hose. Make sure it is not plugged.
Odds are that you will find the problem quite quickly.
Cheerfuls.

Sep 27, 2015 | 1991 Toyota Corolla

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

1 Answer

2001 Town and Country. Coolant backing up into overflow bottle, which is causing the overall level to drop. As a result, I have no heat in the passenger compartment. Get heat when system refilled. At a...


If everything is working correctly; thermostat, heater core, water pump, head gaskets, etc. Then that leaves the radiator cap, the overflow hose or the overflow tank as being the problem.

As the engine heats up the coolant expands flowing into the overflow tank. As the engine cools the coolant is drawn back into the engine from the overflow tank. but this depends on the vacuum created by the cooling liquid. the radiator cap has a "valve" that lets pressure out and vacuum in. If it fails then you may not achieve a good vacuum. The hose that connects to the over flow tank must be non leaking as well; if it leaked then coolant would not be drawn back into the engine, only air would be sucked in. And lastly the coolant has to be drawn from the bottom of the overflow tank. again we dont want to be sucking air.

Some engines require a vent screw to be opened when bleeding the air out of the engine.

Jan 14, 2011 | 2001 Chrysler Town & Country

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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