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There is a leak that is bad enough the coolant tank drains within minutes im wondering if it could be a hose because it drains in the middle though closer to the opposite side of the car

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If it's a hose, it will leak fast, but don't count out other things like the radiator, water pump, head gasket, etc.

fill the system up with antifreeze and water or just water for diagnosis purposes, and use a pressure tester to force fluid out faster.

Maybe, if the leak is fast, you can look under the car to see exactly where it is coming from.

You say middle and opposite side of car (is this as you're sitting in the driver's seat?).

Where is the leak, now?

Posted on Jul 21, 2010


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How do i change the radiator fluid?

Most radiators have a drain plug on the bottom tank the engine block also has a drain plug . Remove the radiator cap ,open both drains ,let all the coolant run out, if there is no radiator plug remove the lower hose , remove the heater demister hoses, with the heater control on hot flush out all the coolant from the heater radiator. with a garden hose, till the water runs clean, tighten the radiator plug or re fit the hose,put a garden hose into the radiator and flush out till the water at the block plug runs clean ,refit the heater hoses, refit the block plug, fill the radiator from the hose leave the cap off , If it has a overflow tank clean and flush it. start and run engine for 5 minutes top up radiator if needed . stop engine and drain out all water. most important that all old coolant is drained out, only buy the best coolant you can . If you make up your own use only distilled water. keep some to top up with never mix with another brand. Fill radiator with coolant top up over flow tank, run engine top up coolant as needed, refit radiator cap run for another 10 minutes check for leaks,

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My 2000 jetta is leaking coolant , it only does this when i turn it off after a 10-20 min drive(im guessing this leak is somewhere within the heating core, since i cant find where that water is going , all...

take it to an accredited radiator shop and have the system pressure tested ' could be a cracked plastic radiator tank leaking under pressure

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My engine coolant fluid is leaking, I have filled it twice within the past month, and the leak has gotten worse. I filled the tank this morning and it has now left me with less than a quarter of fluid. I...

there is a drain plug on the bottom of the radiator, it is at one end or the other-turn it counter clockwise to drain antifreeze, sometimes you have to remove a plastic airdam/shield to see/get to it. An easy way is just cut the hose off-you are going to put a new one on anyway, and you won't lose more than a gallon of antifreeze although if you are fast (you pretty much have to be draining a radiator) you can get a pan underneath and catch a lot of it-I still would just replace it with fresh 50/50 antifreeze, it will take less than 2 gallons to refil. Remember to do this when the engine is cold.

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I hve water leaking from the rear of my engine on my 98 expedition

Hello moltn, quite often people completely fill their coolant reservoir, ( the plastic bottle with the cap that says, " coolant " ), If you haven't already, make sure that the coolant level in the reservoir isn't over the FULL line. When it is overfilled, and the engine runs for a few minutes, the heat builds some pressure and forces the extra coolant out through an overfill hose. That overfill hose usually drains, on the ground, in the general area your leak is comming from.
If that is NOT the problem;

Next, we need to find out if it leaks all the time, or, if it only leaks under pressure, ( when the engine is running and warmed up ).

Start the vehicle just long enough to back it up 2 or 3 feet and then turn the engine back off. Raise the hood and visually inspect the area where you seem to leaking from. Allow about 10 minutes and then look to see if you have a new puddle under the vehicle.

If it's a non-pressure leak, you should be able to spot it right away, most likely a loose hose clamp, If so, first look closely at the condition of the hose, if it looks okay go ahead and tighten the clamp, ( you often only need about 1 full turn on the screw/nut that tightens the clamp.)
As rubber hoses age they lose some of their integrity, so clamp should be checked atleast every six months.

If you find nothing leaking, it is likely a pressure leak that is often the result of the engine and coolant reaching their operating temperature and as they do the heat builds perssure and will usually force coolant out of any weak links in the cooling system.

Let the engine run 6 to 8 minutes to allow the vehicle to get to its normal operating temperature.
Look at your temperature gauge, your needle should be about in the middle. Go back and look in the engine compartment again and visually inspect for signs of leaks. You should be able to locate any pressure leaks at this point. As before, if you locate the leak, and it is at a hose, do a good visual inspection of the hose, and the clamp.

Good luck my friend!

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1 Answer

I need to change the cooling liquid to my cars radiator

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Re-connect the hose, re-fill the radiator with water and run the engine for a minute or two, then drain again. Then, connect the hose (or close the drain) and add new coolant. Run the engine while filling and keep the heater on high heat. When the engine reaches operating temp, turn it off, wait about three to five minutes and re-start and continue filling.
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Overfilled coolant reservoir

This should not be a big deal. You can try a syphon tube but DO NOT SWALLOW ANY COOLANT. Or use a large turkey baster to **** up up coolant. It takes awhile though.
The car is fine to drive.

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When the car is completely cool,check the electric fan(s) for smooth rotation.

Clean/check/change the thermo sensor,contact and wire.


Excavate air pocket in coolant system / check for head gasket leak

This test will kill two birds with one stone.




You will spill some coolant during this air pocket purge test.......BEKIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!


Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .

Top of the coolant reserve tank

Let it ran for 10-15 minutes.

Monitor for air pockets escaping from coolant reserve tank.

Small amount of bubbles is OK at 1-5 minute mark

After the thermostat2_bing.gif open up (after 195 F warm up) at
5-12 minute mark or after high idle you should see less bubbles.

If you do not see any in rush of bubbles then your thermostat may bepartially stuck or rusted badly inside the thermostat hosing.

Give the thermostat host few gentle taps.

If you see larger bubbles surfacing after 15 minutes then should do ahydrocarbon (HC) dye test to test for potential head gasket leak.

Let engine cold down and top off coolant reserve tank.

Start monitor for coolant lost


A coolant flush is require every 2 years or 24,000 miles.

I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.

Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.

Please post more information by clicking the comment link on the top right corner.

DON'T FORGET to RATE ME if my tip is helpful to you!

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Or the coolant tank is broken! You may have to remove the tank to figure out which as the hose is hard to get to with the trank bolted down. The hose could be rotted or the cap may not be releasing buid up of pressue or the head gasket or engine casting of one kind or other may be leaking commpression presure into the cooling system. It maybe time to go back to the rebuilder and have them check their work. If they finished the job all the way it sould'nt leak and they should of run it long enough to find a proble like that and fixed it before you gotr the car back.

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