No Pressure Radiator Cap

Cost was only 3 or 4 dollars.

No pressure radiator cap.

Most radiator pressure caps keep the system pressure at 16 psi so the engine coolant can get considerably hotter without the fear that it will boil off. The old mopars originally had no pressure radiator systems. Sometimes its hard to find a correct radiator cap. If you have a radiator pressure tester then you can inspect the cooling system on your own.

High pressure caps are available in pressures ranging form 19 to 32 pounds. Pressure testing the radiator. Now after running the engine for 15 minutes or so i can remove the radiator cap and there still is no pressure on it. There is one coolant cap that is quite different others.

So i filled up the radiator. High pressure caps are made for use on race cars only. My dipstick shows no sign of coolant. So i replaced the radiator cap.

The cap pressure rating has nothing to do with regulating your engine coolant temperature nor will it make your engine run cooler. I m not losing coolant. The cap on the right has been mangled to do that. My coolant shows no sign of oil.

No pressure but it gets up to. I can drive my rig for hours and nothing. Let s take a pan of water and heat it up. If there is no pressure in the cooling system the coolant will boil off.

I m at my wits end. We get asked this question daily and it seems most people misunderstand what the pressure cap does. It might simply be that the cap is no longer holding the pressure correctly. To make a no pressure cap you want to remove the inner seal and fully tighten the cap so the outer seal keeps the coolant in the radiator and the overflow tank.

You will also want to check the cap if you begin to have problems with the cooling system. However you want to be sure that the problem is the cap and not in another part of the system. The water heats up and boils and 212 degrees. The problem is my pepcock on my brand new radiator is leaking.

The outer seal seals the cap to the radiator. They should not be used on passenger cars. The easiest way to fix this problem is with a new radiator cap. Visually inspect that cap to make sure the spring moves freely and there is no debris or corrosion under the cap.

Now i don t know what to do. This may help you find leaks or determine if the radiator cap has gone bad. Sometime back i found one available at napa stores they may have to order it in from the warehouse but last i knew they had them. High pressure caps are available for open and closed cooling systems.

I installed the stat spring side down so thats okay. When i removed the radiator cap there was no pressure on it. On the other hand if the pressure was allowed to increase above 16 psi the cooling system including the hoses and.