![]() The most effective plastic bond comes from liquefying the plastic with heated tools and creating a weld. (Related Video: Fix Coolant Leaks - ) Step 5 – Repairing a plastic radiator with plastic weldingĭue to its high petrochemical content, most efforts to glue plastic have limited success because the bond is weak. However, if you have the time and aptitude for a DIY, the best cooling system repair is always a new, properly installed gasket. The Fiberlock cures while immersed in DexCool, and the pressurization of the system aids in creating a stronger seal. You may pour Fiberlock directly into the cooling system as it is compatible with DexCool and all types of coolant. This is not the case with Fiberlock Head Gasket and Block Repair. The cooling system must be flushed completely free of DexCool so that the sealant will cure. Many cooling system stop-leak additives require complex, exacting, and time consuming application processes to be effective. Step 4 – Repairing a coolant leak with Fiberlock This can be confirmed by a puff of white tail-pipe smoke on start up.įeatured Video: Pressure Testing Cooling Systems If the system loses pressure without evidence of an external leak, the coolant may be seeping through the head gasket into the cylinders.When you spot a leak, don't assume that is the only leak.Do not pressurize the system over 15 psi. Observe the pressure limit printed on the expansion tank cap for example, 15 psi on the Vortec 5.3 liter.If you intend to drain the system after pressure testing, then it is not necessary to waste good coolant topping up for pressure testing. Air in the cooling system will compress under pressure and give misleading readings, but liquid coolant does not compress. Top up the coolant level before attaching the pressure tester.Ensure that the cooling system is cold.The Silverado Vortec engines use a pressurized expansion tank, so that is where the pressure tester will be attached to the system. Pressurizing the cooling system quickly isolates leaks, since the coolant will bubble or spray out from the affected area. Step 3 – Pressure testing the cooling system Keep dogs and cats away where they cannot lick spilled coolant. Wear eye protection, long sleeves and gloves. Continue wiping down a persistently wet area until you find the source of the leak.ĭexCool and other coolants are poisonous.If an area is generally wet, wipe it down with an old towel so that you can see fresh coolant tracks.A warm radiator may very obviously spritz out coolant from a pinhole leak. Radiators often develop pinhole leaks that will wet the fins as the coolant runs down. Older water pumps seep where they are sealed to the engine block. Hoses often seep where they connect to a nozzle. Look in the most likely places above the white paper locations.Then use the drip locations on the paper to narrow down where coolant may be running off the engine. ![]() Place white paper under the engine area when the truck will sit overnight.The coolant is low in the expansion tank or regularly needs replenished to bring the level back up.The distinctive, orange-tinted puddle of slick, slippery feeling liquid on the garage floor under the truck's engine area.The sweet, honeysuckle odor of DexCool often in an enclosed garage after the Silverado has been shut off.These are initial signs that should call your attention to a possible coolant leak: Urethane Supply Co.'s Radiator Repair Kit.
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