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My reservoir tank for Radiator is leaking... how to fix or how much?

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Take out the tank and apply magic on it or silicon rubber.. let it dry for 4 to 5 hours then put it back.

Posted on Aug 01, 2010


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Our car leaked out antifreeze and now the tank is empty.we got a new pump putin a few months ago and can't find radiator cap.

The cap you removed on the reservoir is the radiator cap. The reservoir is part of the sealed cooling system. There is no physical cap on the radiator itself.

I’m happy to assist further over the phone at

Nov 18, 2015 | 1997 Chrysler Concorde

1 Answer

Coolant leaking out of reservoir and radiator. I have to fill tank once a week. The radiator seems to be full when checked cold.

replace the faulty reservoir or radiator
what is happening is that the radiator cap is not raising the pressure in the cooling system because of a leak in the system
the excess water from heating is being pushed out probably onto the ground through the leak
when the cooling system cools down , water is being drawn back into the radiator
probably find a crack in the radiator tank that opens under pressure but seal off as the pressure is lost

Oct 09, 2015 | 2009 Jeep Grand Cherokee

3 Answers

My 2002chevy trailblazer is leaking some where under the resoivre and if I go to long driving it will over heat but the radiator has water

the tank might have a crack or hose leak if not tank the heater hose lines run under there also

Aug 04, 2015 | Cars & Trucks

2 Answers

Radiator leaking transmission fluid

It sound like the transmission cooler inside the radiator tank is leaking into the coolant. You could try to fix it yourself, but without the proper tools the tanks are difficult to R&R. I'd try to take the radiator back to whoever you got it from.

Oct 29, 2013 | Chevrolet Cars & Trucks

1 Answer

2000 ford mercury sable ls i own this car and coolant leaks from under or off the side of the antifreeze reservoir i can't see this leak but only does it while running leaks a lot of antifreeze ways...

if is a slow leak and you don't hear a load hissing is ok! replace any hose that you think needs replacement, on top of that check your radiator hoses for swelling ,if the car is leaking water each time you drive the car your risking the engine to blow a head gasket so I would fix the problem right away....

Dec 28, 2017 | 2000 Mercury Sable

1 Answer

Trans fluid in radiator tray

You are leaking transmission fluid from either the fluid cooling lines that run from transmission to a separate reservoir in the radiator, or leaking from the reservoir itself. Hopefully, it's only the lines and may just need tightening to stop the leak.
There are two lines to the radiator's reservoir. One brings fluid from transmission to the reservoir, and a return line back into the transmission. Probably located on driver's side of the radiator, one will be near top of radiator, and one near the bottom. Small copper or steel lines that may also turn into rubber lines. Clean the area well with rags to locate the leak. Will probably need to have the car running to make it leak, while looking for it. You could also take a wrench and try tightening the fittings at the radiator, and tighten any rubber hose clamps that you see. If it's not the lines or hoses that are leaking, then the radiator may need to be pulled off for repairs or replacement. But 9 times out of ten, it is a leak from one of the lines.
When fixed, don't forget to check your transmission fluid level. Or keep adding till it is fixed.

Mar 02, 2012 | 1996 Pontiac Grand Am

1 Answer

Some prestone leaking after I park my car in driveway... also notice the coolant receptacle tank always goes down after few days, and I always have to refill after 3 or 4 days... what can be the problem,...

Could be any number of things. A leaking radiator hose or heater hose, leaking radiator core, leaking heater core, leaking hose from radiator cap to reservoir, or even a leaking reservoir.

Probably ought to take to a shop (check with friends, neighbors, relatives to get a consensus on a reputable local mechanic) and have them search out the source of the leak(s)

Good luck!

Feb 06, 2011 | 2000 Chevrolet Venture

1 Answer

Have a small leak in the cooling system of my 1999 VW Jetta 4 cylinder 2.0l, and was advised to use Bar's Stop leak. It is suggested, after calling Bar's, to add it directly to the radiator, not the...

that stuff is only a quick fix, pressure test it and fix the leak other wise run the engine so the thermostat opens then just pour it in the reserviour tank if thats what your radiator directly feeds off then take it for a big drive. good luck.

Feb 01, 2011 | 1999 Volkswagen Jetta

1 Answer

Where is the radiator cap located on 2001 Saturn SW2?

Your system does not have a cap on the radiator. It is a 'sealed system' with the reservoir holding pressure. This is not so much an 'overflow' tank like some systems, but an expansion tank.

You can add the stop leak directly into the tank.

Feb 06, 2010 | 2001 Saturn SW

1 Answer

Leak from reservoir

please take this car back to the repair center,,,tell the service guy that you want a courtesy car,,and for them to keep your car until they can prove that the problems are fixed once and for all.

Jan 17, 2009 | 1999 Ford Taurus

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