Ultimate Guide Fixing a Radiator Cap That Won't Hold Pressure

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 ... Don't the radiator caps hold the pressure? Maybe the cap is loose ... My problem is that I can drive my truck all day and it won't accumulate ... So is this the cause of my overheating problem all this time. I guess every time I turn the car off it won't pull back coolant from the ... After the engine has fully warmed up, the coolant has expanded and raised the pressure in the closed system. Loosen the exp tank cap slowly ( ... 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 ... loose belt, loose hose clamp, strainer lid not tight.... If you still have the old cap and pressure tester, you can test the cap and see where ... Having a higher pressure radiator cap won't make your system run cooler... ... My original cap doesnt hold pressure, just lets water out when ... That having been said...just keep the tank full enough to make up for the stem that WILL escape, and do a test when you get the cap to determine ... In normal use, the pressure will never be anywhere near 1.4Bar, much less 2.0. The cap and it's pressure relief setting are almost certainly correct after all the work previously done, but I'd double check the concentration ...