Originally Posted by kparrent
In the process of trying to get my coming system air tight, I discovered a very slow leak at the top of my radiator near the UR Hose as shown here:
It'* very slow it seems. Only found it because it made some fizzing sounds. Any need to worry?
The coolant is NOT spraying on top of the radiator end tank from the leaking around the upper radiator clamp? Is that correct?
If it'* leaking on top, that'* not a slow leak. It'* a pressure related leak. When the cooling system gets warmed up and starts to build up pressure, the tank is being expanded by the pressure and that leak opens and the pressure is squirting the water out. It will speed up the longer it goes as the tank cracks open more.
When the pressure is reduced or gone, there'* not much leaking.
The problem is that you hear the sputtering. The means there'* air being left in the radiator and coolant is not being sucked back from the reservoir tank properly. Otherwise the sound would have been just the coolant oozing or the sound of the squirt through the crack.
Replace radiator. It'* a few bolts and hoses and the metal lines for the transmission cooler, and it lifts right out of the sponge rubber holder on the bottoms. You can see the sponge rubber holder in your picture on the top.