Master the Pressure How to Diagnose and Fix a Radiator Cap That's Losing It

It can be confirmed with a simple chemical test for CO2 in the coolant. Left unfixed, you can rupture your radiator >> blow out all your coolant ... 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 ... 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 ... What I do a few times a week is open my radiator cap with the engine running, top it off with premix 50/50, and let it run. Initially, I had ... If desperate, drill the cap for zero pressure. Route the overflow into a 2 liter jug for catch. Drive conservatively. Your coolant must be mixed ... Remove bleed screw and expansion tank cap, add coolant EXTREMELY SLOWLY to block through upper radiator hose until full, then flip hose around ... In normal use, the pressure will never be anywhere near 1.4Bar, much less 2.0. That piece won't get far. It should stay in the top tank. If your OCD wants to get it out, try fishing for it. If you have a fibre optic ... I'd stay with 16 PSI radiator cap. It raises the boiling temp of coolant and also is a high pressure limiter for the cooling system. The radiator cap seals are damaged. The radiator cap valve is stuck. The radiator cap doesn't hold pressure. Common Bad Radiator Cap Symptoms.