Repeat the test to … Your answer will be published for anyone to see and rate. The pressure in the cooling system should reach the maximum of whatever the radiator cap is set for, usually 15 to 17 lbs. I'm at my wits end. 2) White Streaks on Radiator. I think this guy has a blown head gasket that's producing way more pressure in that cooling system than is normal. Use the wrench to tighten the nuts at the top of the valve. If there is no radiator cap, then the overflow tank cap doubles as the radiator cap. 3. Remove the cap from the adapter, and reinstall it on the adapter. help: Your answer will be published for anyone to see and rate. If you notice coolant near the radiator or the radiator cap, then you clearly have leaky coolant. Excessive pressure can damage the radiator. Cooling System Leak Test; 9. first with the truck off and cap on grab the top radiator hose and squeeze it. Removing a home's hot water radiator is sometimes necessary when servicing the unit, or when remodeling or repainting a room. If it WAS getting hotter than normal the result would be even more pressure in the system (assuming it WAS properly sealed). second to check the pump just simply pull a radiator hose and start the truck water should start pumping out if not then you're pump is bad. theres some quick ways to check what's working and not working. It’s been reaching over 100F there this past week. Never remove the cap from a radiator or coolant recovery system reservoir when the engine is hot. Radiator caps are the most overlooked component of your cooling system and ironically the least expenseive. 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Fox 5.0 Mustang Tech. Safety Lever Radiator Cap MotoRad safety lever radiator caps utilize a lever that locks the cap to the filler neck requiring the lever be lifted before removal. Remove the Radiator Cap. I gave the cap a 1/4 turn and I heard a short hiss from inside the container, most likely because the air pressure was greater inside the tank. Valves on these pipes let you cut off the water supply for the radiator and isolate it from the system. 88gt373 Member. I would guess so, just take a look inside the pump cavity and maybe all your questions will be answered. Pump the pressure tester to the pressure stamped on the radiator cap. If the hoses are in good condition there is no worry about them bursting. It is pressurized. If so, then replace the cap. Each additional pound of pressure above the specified pressure increases the boiling point of the coolant by 1.4°C or 2.5°F. Thats the only logical thing that would cause this symptom. The cap doesn't want to lift and I checked the threading on the cap and noticed that it's not to be turned any more. Allowing the car to sit for around 30 minutes will ensure the pressure and temperature has dropped to a safe level before you attempt to remove the radiator cap. So you hooked a pressure kit to the rad and it showed no pressure??? If you'd like to get expert points and benefit from positive ratings, please create a new account or login into an existing account 1994 Dodge Ram 1500 4x4 5.9L - Still a POS (but my DD). No luck. Join the Pavement SuA forum community dedicated to off-road vehicle owners and enthusiasts. Your radiator cap is a small part that plays a big role in keeping your engine from overheating. As the vacuum continues to build up, the two-way check valve, which is exactly what a radiator pressure cap is, goes to work. The cap pressure rating has nothing to do with regulating your engine coolant temperature, nor will it make your engine run cooler. … Use an adjustable wrench to tighten the valves even further. So it's not overheating, sounds like the pump is slightly bypassing. I'm not losing coolant. If you have a cooling system pressure tester you could pressurize the system to verify what it seems you already know...no leaks and with that same tester you can also test the cap to see if it holds pressure up to its rated limit. Radiator caps almost always fail toward lesser pressure, not higher. So I replaced the radiator cap. below. I installed the stat spring side down so thats okay. I marked it when my problem started, both my high (engine hot) and low (engine cold) levels. Check to see if the radiator has holes in it or if the cap looks worn or damaged. It all happened after I replaced my thermostat. It's a new pump from autozone. Once you have determined the system has little to no pressure inside slowly remove the radiator cap. My dipstick shows no sign of coolant. Anyone else?!?! Thats weird though how it doesnt overheat but the pump is bad :confused, Please don't change the water pump yet. Your answer will not be displayed immediately. Each post is the personal opinion of the Visual Inspection of the Radiator Core; 5. If the radiator cap is stuck, pressure may build inside of the radiator, which could cause cooling system components to leak or burst. Suite 500, Troy, Michigan 48084 USA. STILL, no luck. HTH. FAQS.ORG reserves the right to edit your answer as to improve its clarity. Generally caps are designed from 4PSI (30kPa) to 30PSI (205kPa). The coolant expands and contracts as it is heated and cooled. You will learn how to take off a radiator from the wall for decorating with paint, wallpaper or ceramic tiles and how to drain it down so that you don't get dirty radiator water all over your carpets. Serious injury can come from removing the cap from a hot engine. 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