How Do You Repair A Cracked Plastic Radiator Inlet?

Over time, due to constant heating and cooling cycles, the plastic parts of a radiator may become brittle and even crack. Replacing a radiator that has a cracked inlet tube is not necessary if you prefer to repair the crack. Although a repaired crack may not give you the same longevity of a new radiator, it will buy you a lot of time before the radiator must be replaced.

Remove the upper radiator hose form the radiator inlet tube, squeezing the compression tabs together on the radiator clamp. This releases the pressure on the hose. Pull the hose off the inlet tube.

If the lower inlet tube is cracked, first drain the radiator fluid by placing a drain pan under the petcock on the bottom of the radiator. Open the petcock and let the fluid drain. Sand the inlet tube with 600-grit sandpaper to give the epoxy a surface to adhere to.

Sand approximately 1 inch around the crack to allow enough room for the epoxy. Mix the two-part plastic epoxy together. The epoxy must have a heat rating of ... more.

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