No Pressure Radiator Cap

The cap pressure rating has nothing to do with regulating your engine coolant temperature nor will it make your engine run cooler.

No pressure radiator cap. On the other hand if the pressure was allowed to increase above 16 psi the cooling system including the hoses and. We get asked this question daily and it seems most people misunderstand what the pressure cap does. If there is no pressure in the cooling system the coolant will boil off. The old mopars originally had no pressure radiator systems.

The outer seal seals the cap to the radiator. So i replaced the radiator cap. I thought that it might be because the radiator was only 1 2 full of water. Sometimes its hard to find a correct radiator cap.

Pressure testing the radiator. The cap on the right has been mangled to do that. I m not losing coolant. So i filled up the radiator.

My coolant shows no sign of oil. Cost was only 3 or 4 dollars. High pressure caps are made for use on race cars only. The easiest way to fix this problem is with a new radiator cap.

When i removed the radiator cap there was no pressure on it. 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. If you have a radiator pressure tester then you can inspect the cooling system on your own.

High pressure caps are available for open and closed cooling systems. However you want to be sure that the problem is the cap and not in another part of the system. Now after running the engine for 15 minutes or so i can remove the radiator cap and there still is no pressure on it. Let s take a pan of water and heat it up.

The water heats up and boils and 212 degrees. I m at my wits end. Visually inspect that cap to make sure the spring moves freely and there is no debris or corrosion under the cap. 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.

They should not be used on passenger cars. My dipstick shows no sign of coolant. There is one coolant cap that is quite different others. Find radiator caps with 0 psi maximum pressure psi and stant cap logo and get free shipping on orders over 99 at summit racing.

You will also want to check the cap if you begin to have problems with the cooling system. 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. I bleed the system. High pressure caps are available in pressures ranging form 19 to 32 pounds.

This may help you find leaks or determine if the radiator cap has gone bad. Now i don t know what to do. I can drive my rig for hours and nothing.