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

stuck thermostat
cooling fan motor slow to cool
hoses too soft or leaks at clamps
clogged radiator
head gasket blown

2002 Cadillac Seville Parts GM Parts Department Buy genuine GM auto parts...

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.

DID YOU BLEED AIR OUT THE COOLANT SYSTEM.TO BLEED COOLANT SYSTEM, FILL THE COOLANT SYSTEM THROUGH THE RESERVOIR TANK OR THE RADIATOR UNTIL THE FULL COLD MARK IS REACHED.BESURE TO USE 50/50 HALF WATER AND ANTIFREEZE.YOU CAN BUY ANTIFREEZE THAT IS ALREADY PREMIX 50/50.AFTER ADDING ANTIFREEZE TO RESERVOIR OR RADIATOR FILL RADIATOR TO FULL MARK OR IF YOU DONT HAVE RADIATOR CAP ON RADIATOR POUR ANTIFREEZE IN THE OVERFLOW JUG UNTIL COOLANT LEVEL STAY THE FULL COLD MARK.WAIT AWHILE UNTIL COOLANT LEVEL STOP DROPPING.NOW INSTALL THE RADIATOR OR OVER FLOW JUG CAP.START THE ENGINE AND ALLOW IT TO RUN UNTIL NORMAL OPERATING TEMPERATURE IS REACHED AND THE UPPER RADIATOR HOSE BECOME HOT.STOP THE ENGINE AND OBSERVE THE COOLANT LEVEL IN THE OVERFLOW JUG. THE COOLANT LEVEL SHOULD BE AT THE FULL HOT LINE.ALLOW THE ENGINE TO COOL UNTIL THE AMBIENT TEMPERATURE IS REACHED THEN CHECK THE COOLANT LEVEL IT SHOULD BE AT OR ABOVE THE FULL COLD LINE.ADD MORE COOLANT IF NECESSARY. WARNING BECAREFUL WHEN OPEN THE RADIATOR CAP OR JUG OVER FLOW CAP.USE A LARGE RAG OVER THE RADIATOR CAP TO KEEP FROM GETTING SCALDED.OPEN RADIATOR CAP A LITTLE AT A TIME TO KEEP FROM GETTING SCALDED.WAIT UNTIL ENGINE COOL DOWN BEFORE OPENING RADIATOR CAP OR OVERFLOW JUG CAP.WEAR SAFETY GLASSES.

First, your car is equipped with a "Surge Tank". you don't fill the cooling system through the radiator.

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.

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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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

The stop leak have restricted the coolant flow to your heater core. You can try flushing out the Stop leak with Preston Radiator flush or replace the heater core. Once Cooling system flushed out, replace thermostat, radiator cap and repair coolant leak. Good luck and hope this helps, and Note: Common Black kitchen Pepper does great as a radiator stop leak without leaving any residue and can be cleaned out of the system with water and not coolant flush. Two table spoon is more then enough to stop a small leak. Good luck and keep me posted friend.

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.

The small[pencil size] hose connected just below the radiator cap & to the plastic coolant reservior is the coolant over-flow hose,allowing the coolant to flow into the tank as it expands from being heated,and return to the system as it cools.If the leak is near the radiator fitting,possibly damaged portion can be cut off while engine is cool,and hose re-fitted.Replacement tubing is available at auto parts supply stores,identifiyed by it's inside diameter measurement.

anti freeze goes in tthe over flow tank if there is no fluid in there check you radiator if it is full replace the cap it allows the fluid to transfer from the over flow to the radiator