Question about 1999 Volkswagen Jetta

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Cooling leak where can i put stop leak there is no radiator cap only over flow tank

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  • yadayada
    yadayada May 11, 2010

    Where is the leak at?

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If you want to add stop-leak, you add it through the overflow tank (that's the standard fill spot on this car). However, I'd try to pinpoint the leak and fix it rather than use stop-leak - you run the risk of clogging up something in the system that shouldn't be clogged up.

Posted on Oct 29, 2008

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Can i put coolent leak repair through the reservoir tank as we cant find the radiator cap in this VW Bora v5


It depends on the type of leak sealer and how much flow there is through the degassing tank. If the leak sealer is a solid it should not be put in the tank and if it is a liquid with lots of solids that must be vigorously shaken it would be better if it isn't added to the tank unless the coolant level is first lowered to effectively empty the tank so the leak sealer will enter the main cooling system almost immediately.

In almost every case the best results are usually obtained by adding directly to the radiator and in the absence of a radiator cap or a filler on the engine, disconnecting the top radiator hose and adding the leak sealer there before reconnecting and topping up with the saved coolant will ensure maximum efficiency of the product.

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My sunfire overheats and leaks out overflow everytime i drivee it.i changed water pump,thermostat the fan is working fine and had a water pressure test done last mth


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How would i go about putting stopleak in my radiator? i dont see a radiator cap


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Secondly, I think I should warn you that the problem with using stopleak in a cooling system is the fact that it works! It will clog EVERYTHING up! It will stop up your radiator, it will block your heater core and it will restrict the coolant flow through your cylinder head gasket orifices. Unless you want to overheat and destroy your engine as well as other cooling system components, I would not put that stuff in there. I have had to clean that mess up many times, Believe me, it is not pretty.

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Hello. I have a 2000 Dodge Intrepid, 3.2, V-6 which is leaking antifreeze. I'm female, but haven't fallen off the turnip truck yesterday. Asked my guy friends, so have an idea what the problem might be,...


There is no radiator cap. The over flow tank is part of the cooling system and feeds coolant directly into it (and/or circulates coolant through it). Unlike a true overflow that will just catch any excessive coolant and store it until the radiator cools down and sucks it back in.

So think of the reservoir on your vehicle an extension of the side tank of your radiator.

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2 Answers

Im trying to stop a internal leak on in the cooling system do i pour directly into overflow tank then> Pontiac grand am 99


If you are putting in stop leak then yeah it goes in there because the radiator cap is on the overflow tank. But I wouldn't recommend using stop leak. The engine likely needs new intake manifold gaskets because that is a common problem with that engine. It would be better to just replace the gaskets

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I put stop leak in radiator and now the car blows cold air vs hot air when running the heater. why?


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1 Answer

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It sounds like you have air in the Cooling system and the bars leak permanent seal does not help. The sealer creates restrictions through out the water jackets and can cause the thermostat to stick. Replace the radiator cap and run the truck with the radiator cap on the first click and keep an eye on the over flow tank, refill the over flow as needed and make sure you have the heater on the highest setting to work out all the air in the system. Once all the air has worked it's way out of the system, then you can close the radiator cap to the second click to ensure full pressure is built up in your cooling system. Good luck and keep me posted.

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1 Answer

2001 Kia Rio Cooling is leaking from hose near to the radiator cap.


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