Cooling System Rejuvenation How to Fix a Radiator Cap That's Not Holding Pressure

Engine cold, loosen the cap to release any pressure then put it back on. Squeeze the top radiator hose to feel for pressure inside. Start the ... If you can get it clean and dry you can temporarily fix it using two part steel epoxy putty. Mix the putty well and roughen the area with coarse ... ... won't be long until those OE radiator caps are gone as well. ... When the radiator cap can't hold 18 lbs. of pressure the radiator ... When you remove the cap on the system, you're reducing the pressure immediately and your 220 degree coolant is allowed to boil all at once. All ... Header tank cap or radiator cap is faulty ... The car coolant header tank is equipped with a pressure release valve in the filler cap, intended to release coolant ... if your cap isn't holding pressure take off the cap (Make sure your engine is cooled and de-pressurized first!) and take a pair of needle nose ... The cap should vent at 16psi. When it's cold there shouldn't be any pressure under there as it should be linked to your overflow bottle to vent excess pressure ... Pressure Problems One of the most common issues with radiator caps is improper pressure regulation. If the cap doesn't maintain the right pressure within ... There is no valve in the radiator cap that permits only gases or vapors to pass and not liquids. If the cap is not sealing, there is a pathway ... Here I show how to test a radiator cap without false results. A diagnostic tech has the tools and knowledge to prove their work, not just ...