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It might be a bad thermostat, or something worse, such as a blown head gasket/cracked head. Either of those scenarios will cause the cooling system to pressurized beyond it's specified capacity, and the pressure will force the coolant out of the reservoir.

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โˆ™ 2005-01-20 05:59:54
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Q: What can cause the radiator water to leak from the top of the reservoir tank?
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What would cause the radiator fluid to run out the reservoir tank?

It depends on what you mean by "run out" but there is probably a leak in the tank.


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Sounds like your water level is running low. Check the level in the radiator reservoir You may also have a leak.


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Where is it leaking from? Could leak from the radiator, hoses, or water pump.


What would cause the water in overflow reservoir not to return to radiator when engine is cold 1985 Honda accord lx runs hot how do I replace thermostat?

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What would be the cause of water draining in the radiator without a leak?

blown head gasket


Can a stuck thermostat cause water leaks in radiator?

No. The only times the radiator would leak is if it was damaged, defective, or corroded.


You always fill up the water reservoir of the radiator of vehicle because it is always getting emptied when you run the vehicle. any causes or what shall you check?

Could be a hose leak, a radiator leak or a head gakket leak. The water in the reservoir will get "sucked" into the cooling system if the level get low. Look for water on the ground or signs of spray under the hood. If it's a head gasket, look for water dripping from the exhaust pipe on start-up and/or steam. That would indicate that water is getting into the combustion chamber.


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Why could your 94 BMW be using so much coolant?

It probably has a leak. Here's something to check - the radiator has a tube coming out to the reservoir, so when it gets hot and expands the coolant goes into the reservoir and should go back into the radiator when it cools, but if your reservoir has a crack and the coolant leaks out, well it's gone and can't go back into the radiator - this would cause a lot of loss of coolant.


How would a radiator cap cause a leak?

A radiator cap would not cause a leak! However, if the radiator cap is holding pressure, other weak parts could signal issues in need of attention.


Why doesn't the radiator of a car pull the water back from the reservoir even if the radiator cap is new?

It sounds like there's a leak somewhere. If it's not in the cap, it could be in the hose, or the connection, or the radiator itself. If you can't figure this out on your own, take it to a mechanic.


What cause water loss in a 2003 Chrysler sebring?

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What would cause a radiator water leak from under the hood if not hoses leaking?

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What causes antifreeze to overflow into radiator reservoir on a 1990 Honda Civic LX?

If you have excessive bubbles coming from your radiator (remove the radiator cap only when the engine is cold) with the engine running, Then you have a blown head gasket. You may need to increase the idle speed a bit to see the exhaust gasses coming out. Fill the radiator to over full with water. An other cause is: the engine must be able to pull a vacuum on the reservoir hose to return the water to the engine as it cools. I have found that the plastic reservoir cap may have a hole or crack under the cap. Take the cap off with the hoses attached, clean it, then blow on the hose covering the other hose end to see if it leaks. It must not leak. If it does then water can fill the reservoir but not return to the engine.


What causes water leak into passenger side on ford fiesta 2003?

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Does there always have to be fluid in the radiator resivior?

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What will happen when radiator has a crack?

If it is a water-filled or oil-filled radiator, it will leak fluid.


What if you put radiator stop leak in the coolant reservoir?

You should try to avoid using a stop-leak product. All you'll do is gunk up your cooling system reducing cooling capacity and you'll never get that stuff out. If you have a radiator leak, remove it (usually just a matter of an electrical connector for fan(s) a couple of hose clamps and a couple of bolts holding the radiator in a bracket) and take it to a radiator repair shop. A little solder in the right place and you have a like-new radiator with full cooling capacity. If you've already added stop leak to the reservoir, remove the reservoir and rinse the stuff out. Coolant is drawn out of the reservoir when the engine is cooling down. Best case the hose from the reservoir to the radiator will get plugged. Worst case you could get a lump of sealant that might sit for hours congealing (remember the coolant isn't circulating) before the engine is started again. Cheers


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Does a bad thermostat cause coolant to leak out?

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You might have a slight leak in your radiator or AC condenser. Or maybe its just water residual from your last rainstorm or car wash.


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Would a blown head gasket cause your radiator to leak?

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