Antifreeze and Engine Coolant
Honda Accord LX

Why would coolant leak from the overflow bottle?


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2009-07-05 14:58:17
2009-07-05 14:58:17

I have a 1996 Jimmy and recently replaced the thermostat. I know the raditor drain plug is not too far under the coolant recovery tank, if not that, you may simply have a hole in the tank. From what I've heard, I would use caution using stop leak products, but I am far from an expert. The question is--- is it leaking or just always low on fluid. A leak in the tank is possible but another possibility is the head gasket is allowing compustion pressure to get into the cooling system and blowing it out---check to see if there are bubbles inside the tank when the engine is running ---a sure sign the latter is happening. Jeep recovery tanks often have cracks and leak where the hoses atttach.


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Yes, stop leak turns into a thick substance to plug any leaks, when it ends up in the overflow bottle it turns into sludge there.

your Toyota should have an overflow bottle to retain the antifreeze during normal operations. Unless it is overfull, I would be looking for a leak.

Head Gasket leak most likely.

The coolant will normally leak into the oil or into the cylinder

It means that you have a coolant leak. You need to have the system pressure tested for leaks.

Most commonly this is due to overheating or a blown head gasket. Overheating causes the coolant to expand, and rush into the resevoir, then overflow it. When cool, the coolant that remains will be sucked back into the engine. A blown head gasket can cause the coolant to enter the firing chambers of the engine then be blown out the tailpipe, or the compression can leak into the coolant area and push the coolant out, or allow the coolant to get into the oil pan.

You have a coolant leak.You have a coolant leak.

You might check your overflow tank for coolant. It might be too full

you have to find where the leak is first.

You may have a leak of coolant. Take your car to a shop and tell them you are smelling coolant and may have a leak.

Could be an airlock. try bleeding the system until the heaters are hot. If it keeps doing it the i would suspect cyl head gasket. Hope this helps

First, if you only look after it has disappeared, there is no coolant left to be leaking Second, coolant will often leak only under pressure, when it expands from being hot. This often happens when the car is moving, so cannot be observed, or escapes as steam. These leaks can be from small cracks in hoses, often under the clips; from pinholes in the radiator body; from under the pressure cap if the seal is badly worn. If some coolant is already missing, the remainder will heat up faster, setting up a viscious cylcle. In vehicles with an overflow bottle, overheated water goes to the bottle, to be sucked back later by the reduced pressure as the water cools again. In extreme overheating (boiling) the coolant can overflow the bottle, so less is available for sucking back later. Also if the hose to the bottle is cracked or loose, the reduced pressure will suck in air instead of water from the bottle. This leads to a situation where the radiator is quite low (so susceptible to fast overheating) while the overflow bottle contains water, so the user thinks there is enough water and never refills it. Coolant can also leak into the engine block, but this will not "keep" happening, as quite a small amount will cause the engine to stop functioning.

Either theres a clog. or clogged on your engine blog or on your hose.

hi make sure you have not over filled the expansion bottle as coolent will come from the overflow pipe also its worth checking the two small hoses attached to the thermostat housing unit hope this helps john

If a coolant leak were caused by brake work, I'd never have that person work on my brakes - ever. Just the brakes, I would think it highly unlikely that it would result in a coolant leak. If they were replacing the master cylinder, then I could see a possibility of someone inadvertently causing a coolant leak, but that would still even be a stretch.

You would have a coolant leak.

First I would let the car sit overnight. The next BEFORE starting the engine, open the hood and inspect the level of the coolant in the OVERFLOW JAR. If level is too high, adjust to proper level ( sometimes the container is accidently OVERFILLED ) . If it continues, extreme temps caused by one of many things is pushing the coolant out of the overflow tube

A blown head gasket could allow coolant to enter the combustion chamber from the water jacket. The coolant probably is running out the exhaust on first start-up. More often, you will notice the coolant being pumped out of the overflow as the exhaust gas pressurizes the coolant. You should look for this symptom when the engine warms up. Coolant in the exhaust on start-up and then the coolant overpressure overflow from the expansion tank or radiator happening together is almost sure indication of the head gasket failure.

A bad gasket can cause the air fuel mixture to enter the coolant stream, and cause bubbles in the overflow bottle. The gasket needs to be replaced.

The leak could come from: hoses, punctured radiator, split can put tracer dye in the coolant and search for the leak with a black light after you clean the engine.

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