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Sealant for leaking radiator - 1998 Pontiac Sunfire

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Does the stop leak work by swelling the rubber seals or by detecting air and stopping up the leak?

It depends what sort of stop leak you're talking about. There's different types.

Something for a leaking windshield rubber works by filling a gap and then becomes hard, similar to how bathroom sealant works.

An oil stop-leak works by penetrating and 'refurbishing' -swelling- dried gaskets and then hardening when it contacts the air on the outside of the engine block.

Some types of coolant sealant work by allowing particles to congregate/collect around a small hole in a radiator, blocking the hole. The particles harden due to the air/heat to form a plug. This type of sealant can also block your heater matrix, and they do not repair rubber hoses (hoses must be replaced if leaking).

A cylinder head sealant works by either depositing particles in a small crack in the head or gasket, or in the case of a modern head sealant, it uses polymers.

If you have a slight oil leak - slight - on an engine or auto box, try a sealant. If it's anything more than a slight weep, then gasket/seal replacement is the best option.

Aug 03, 2016 | Cars & Trucks

1 Answer

How to add a sealant to the Radiator? And I cant find where the cap ? Will It be easy to do?

Hi, radiator sealant is usually only good for sealing small leaks, did you top up the coolant level? Can you see where the coolant is leaking from? What vehicle is it?

Oct 21, 2014 | Cars & Trucks

1 Answer


Not the radiator is your problem. loosing coolant without leak the thermostat is the problem.
Check your engine thermostat if it is working and if it is not,replace.
it is located at right side of the radiator which connected to the engine, follow the radiator hose.

May 10, 2012 | 2000 BMW 328i

3 Answers

Can a radiator be sealed.My husband is talking about taking the radiator out and sealing it with something

This vehicle has an aluminum radiator with plastic tanks.If he is thinking of using some sort of cilicone sealer he is wasting his time.It will not hold pressure and you will end up overheating the engine and creating a bigger problem.New radiators are not expensive anymore and you can probaly get one at your local parts store for under 200 dollars.

Feb 19, 2011 | 1996 Cadillac DeVille

2 Answers

Radiator leaks around the top seal

I would take the vehicle to a radiator shop for service, they take apart the radiator and flush and clean every line and put it back together, also, they flush the cooling system and if you want, they replace the thermostat and hoses. I you've never have a cooling system service done to your vehicle. It is time. The cost will be less than just replacing the radiator and your vehicle will run cooler.
When you use a Radiator Sealant, the remains will seat at the bottom of the radiator plugging some lines or clogging the cooling passages and a couple of months later the leak comes back. I don't know any radiator sealant that guarantees a permanent fix and tell you where the rest of the stuff you put in the cooling system went. I don't believe that just dissolves and stays on the system to prevent future leaks.
If the leak is on the metal part of the radiator, if you weld it you'll be ok, but when the leak is where the plastic and metal meet, then the above suggestion will do. If the plastic cover is cracked, just get a new radiator. Good Luck!! Don't forget to rate this post!! 4 thumbs will be fine!!

Oct 19, 2010 | 1995 Dodge Dakota

1 Answer

Leaking water from radiator and overheating

The overheating problem is due to the leak. Radiators are suppose to hold pressure and it is Pressure that changes the Boiling point of the water.
Without the Pressure the water will vaporize at a lower temperature and you will not get good cooling. You could also have a clogged system. Also test the Radiator cap.

There are several ways to try to fix this. Radiator Sealant, Rebuild your Radiator, or buy a new Radiator.

The sure solution is buy a new Radiator. Rebuilding one is a little cheaper sometimes, but you may pay someone to put your old parts on a new core. At best, the bad spot can be braised and the rest of the Radiator is good. Buy a new one and do it yourself. You are not paying someone and getting back used parts this way.

Sealant- If you do this you should clean the system first. They make a Coolant system cleaner. Then get a really good brand of Sealant. Not a K-mart item but something over $15 and sold only at NAPA or ask the Dealer. But you will have invested about $25 in cleaner and Sealant with just the Hope of success.

Since antifreeze is over $8 a gallon you need to think about the best way to keep it in the truck.

Jun 27, 2010 | 1990 Ford F150

1 Answer

1996 nissan gxe radiator leak but i can't find the leak

good day Sir, try to use a radiator sealant keep checking it, keep filling it with water, and replace it asap and give the sealant a miss.

May 15, 2010 | 1996 Nissan Sentra

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