Mastering Radiator Cap Repair Step-by-Step Instructions for Restoring Pressure

... cap via some tabs that hold it in place. This plug does the actual sealing of the reservoir cavities and pressure release. The cap will thread all the way ... I had the same problem as you described.Found that the distance from cap to the sealing rubber ( at end of cap ) wasn't as long as it should ... With any automotive cooling system, if the system is not leaking anywhere and it's not building pressure, the only thing which could be ... Check the spring on the radiator cap for rust. Replace the radiator cap if the spring is rusted or compresses with difficulty. Pressure test the radiator cap to ... You could have cross threaded the cap a little when you put it on, so if you replace the cap and it is still hard to screw on you may have to ... 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 ... 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 ... 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 ... With everything going on in the world what is the problem? It's an OPEN cooling system. It's going to suck and pull must I put up a pic of " ... 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 ...