Yes, your theory is plausible. The radiator’s heat and pressure build up to dangerous levels when a car is running. If too much pressure has built up, removing the cap can send boiling water and steam up and out in all directions. Tip: Place a catch pan under the radiator to catch any coolant that may come out when you remove the radiator cap. No luck. There's definitely more going on than just a removing hot radiator cap. I'm at my wits end. Dave Liquorice: 3/2/12 11:53 AM: On Fri, 02 Mar 2012 18:01:12 +0000, Fredxx … Radiator Caps Pressure Rating Always replace the cap with the same pressure rating as recommended by the vehicle manufacturer. My coolant shows no sign of oil. Pressure will not build up if 1) you have a leak...which it sounds like you eliminated as a problem 2)for some reason it is running much cooler than a normal operating temp. Tools and Equipments Required for the Test; 4. Check the pressure on the cap with a radiator cap pressure tester. theres some quick ways to check what's working and not working. Mustang Forums. chevy lumina 93 when i remove the radiator cap there is no pressure what so ever. As long as there is enough coolant, there is no … I would guess so, just take a look inside the pump cavity and maybe all your questions will be answered. I installed the stat spring side down so thats okay. JavaScript is disabled. -- Chris Green Re: How to cap a radiator valve after removing radiator? The cap allows the liquid that was transferred from the radiator to the external reservoir to be pulled back. exactly what I thought. I attempted to remove the radiator cap. If you notice coolant near the radiator or the radiator cap, then you clearly have leaky coolant. FAQS.ORG does not endorse any opinion or any product or service mentioned mentioned in these posts. No luck. They are plastic or resin and they cover the hot metal valves. When the lever is lifted, the valve pressurizing in the cooling system is opened and pressure is vented through the overflow tube making it safe to remove the radiator cap. Checklist for Radiator Pressure Test; 3. Anyone else?!?! My stat got stuck in the open position so I changed it. Pump the pressure tester to the pressure stamped on the radiator cap. I'm at my wits end. Well, first rule, always make sure the cooling system is cool and not hot as it will be pressurized with boiling hot water and cause severe injury opening it in that state. 88gt373 Member. What are you driving? I marked it when my problem started, both my high (engine hot) and low (engine cold) levels. I'm starting to think so. Jul 18, 2011 #1 hey guys, heres the deal: i can drive my car for 30 miles and when i come to a stop i can twist off my radiator cap and the coolant does not shoot out … unless the pump is bypassing. The procedure to burp the system is the same as if there was a radiator cap on the radiator. It's a new pump from autozone. If the cap isn’t releasing excess pressure properly, that pressure can force the coolant to leak out at the point of least … Repeat the test to … Once you have determined the system has little to no pressure inside slowly remove the radiator cap. Come join the discussion about trail reports, builds, performance, modifications, classifieds, troubleshooting, drivetrain, and more!cks forum to discuss all types of off-road activities, vehicle modifications and repairs, land use issues and even camping and fishing. If anything at this point I would suggest another new cap (we all know that just because a part is new doesn't mean it ain't bad). You want to make … No pressure when removing radiator cap (1996 Nissan Pathfinder) Now the vehicle doesn’t overheat while idling Or driving, it starts overheating the moment you turn the ac on and you are sitting in traffic, the temperature starts rising slowly. Replacing your radiator cap regularly can save your customer money at the pump and save wear and tear on your cooling sytem overall. I can drive my rig for hours and nothing. Attach the tester to the radiator and apply enough pressure to test the radiator, engine and hoses, check for leaks. i bought new cap still the same thing. What happens when dry ice is warmed at 1 ATM of pressure? Then I noticed that my system wasn't getting any pressure. We get asked this question daily and it seems most people misunderstand what the pressure cap does. 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. Now I don't know what to do. Remove the caps from the top of these valves. I was planning to rent a pressure tester anyway just as verification as to what I THINK i know. What could be the possible reason there is no pressure i dont see any water leaks and the oil doesnt have water in it????? Caps have a seal that can wear away over time. Each post is the personal opinion of the If anything, a weak water pump would allow the coolant to heat up faster and hotter because it is not circulating coolant as well through the system. Cooling systems is fairly simple in a Ram, perhaps the turbine in the pump is seized and it's not creating any flow, may have to take it off and see. There are several warning signs that your radiator cap is not working right: 1. See if you have thermostatic radiator valves that take the temperature of the room and turn on and off automatically. The pump is about 4 years old. Thread starter 88gt373; Start date Jul 18, 2011; Forums. So I replaced the radiator cap. Keep in mind that when you refill the system there will always be some air trapped. If so, then replace the cap. The reservoir is where excess coolant collects when hot and then is sucked back into the radiator when cold.