If the pressure releases the pressure before reaching the correct pressure, or the cap does not hold pressure, the cap is faulty. If too much pressure has built up, removing the cap can send boiling water and steam up and out in all directions. Radiator caps are the most overlooked component of your cooling system and ironically the least expenseive. Suite 500, Troy, Michigan 48084 USA. The cap allows the liquid that was transferred from the radiator to the external reservoir to be pulled back. After the 1/4 turn, I tried lifiting the cap to pour in the coolant. 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. Do not attempt to remove the radiator cap while the motor is hot. Attach the tester to the radiator and apply enough pressure to test the radiator, engine and hoses, check for leaks. If you WERE low on coolant, then you would be seeing an overheat problem unless it was just a little bit low which would then still allow pressure build up. 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. Once you have determined the system has little to no pressure inside slowly remove the radiator cap. Part 1 of 1: Pressure testing the radiator cap. Don't the radiator caps hold the pressure? theres some quick ways to check what's working and not working. STILL, no luck. Checklist for Radiator Pressure Test; 3. So I replaced the radiator cap. chevy lumina 93 when i remove the radiator cap there is no pressure what so ever. 1994 Ram CTD, 3" lift, 33" A/T's, BHAF, Silencer ring MIA, #0 plate, 024 DV's, DDP 75's, 3k GSK, pusher intake, full gauges, KDP killed, MBRP 4", 03+ trackbar, manual hubs/no cad, rear disc brakes, sport converted, DSS, Espar D5, auto to NV4500 converted, SBC 475. I'm not losing coolant. Thread starter 88gt373; Start date Jul 18, 2011; Forums. Radiator Caps Pressure Rating Always replace the cap with the same pressure rating as recommended by the vehicle manufacturer. Caps have a seal that can wear away over time. FAQS.ORG does not endorse any opinion or any product or service mentioned mentioned in these posts. Carefully touch a radiator hose to see if it is hot. Check the pressure on the cap with a radiator cap pressure tester. I'm at my wits end. Cooling System Leak Test; 9. Removing a Radiator the traditional way and also how to use a simple radiator draining kit called the DrainEasy. No change. poster. I'm starting to think so. The procedure to burp the system is the same as if there was a radiator cap on the radiator. I installed the stat spring side down so thats okay. I would guess so, just take a look inside the pump cavity and maybe all your questions will be answered. It's a new pump from autozone. You agree to hold harmless and indemnify FAQS.ORG against any claims, costs, or damages resulting from publishing your answer. It might simply be that the cap is no longer holding the pressure correctly. Tip: Place a catch pan under the radiator to catch any coolant that may come out when you remove the radiator cap. I can drive my rig for hours and nothing. Any help is appreciated!!! 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. unless the pump is bypassing. I can drive my rig for hours and nothing. 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. Prepare the Tester. No luck. If you notice coolant near the radiator or the radiator cap, then you clearly have leaky coolant. 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. And over time your fuel costs will also increase. Each post is the personal opinion of the No, not over heating. CAUTION. My coolant shows no sign of oil. In response to MIKE, it is true for most cars that the cap is not the highest point. or 3) the system is not sealed properly at the cap. I think this guy has a blown head gasket that's producing way more pressure in that cooling system than is normal. These radiators are connected to the main hot water boiler by an inlet pipe and and outlet pipe. how to change radiator fluid with no radiator cap - YouTube No luck. if you hear air then theres a leak. Then I noticed that my system wasn't getting any pressure. Anyone else?!?! 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. If there is no radiator cap, then the overflow tank cap doubles as the radiator cap. I'll never rule out the possibility that my assumptions aren't infoulable. Radiator caps almost always fail toward lesser pressure, not higher. Keep in mind that when you refill the system there will always be some air trapped. Your answer will be published for anyone to see and rate. Visual Inspection of the Radiator Core; 5. If the rest of the system holds pressure, but you notice no pressure buildup as you heat up the engine, replace the cap. The easiest way to fix this problem is with a new radiator cap. Remove the Radiator Cap. Dave Liquorice: 3/2/12 11:53 AM: On Fri, 02 Mar 2012 18:01:12 +0000, Fredxx … Have you ever heard of cooling systems not building up pressure? RADIATOR CAP RELIEF PRESSURE: 88 - 127 kPa (0.9 - 1.3 kg/cm2, 13 - 18 psi) SYSTEM PRESSURE TEST. Almost bone stock. The coolant expands and contracts as it is heated and cooled. No pressure but it gets up to temp. Use the wrench to tighten the nuts at the top of the valve. Open the pressure tester's case and inspect the unit. STILL, no luck. Now I don't know what to do. Let’s take a pan of water and heat it … 2) White Streaks on Radiator. I marked it when my problem started, both my high (engine hot) and low (engine cold) levels. It all happened after I replaced my thermostat. Excessive pressure can damage the radiator. 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. << Back to: rec.autos.makers.chrysler FAQ, Part 1/6. We get asked this question daily and it seems most people misunderstand what the pressure cap does. There are several warning signs that your radiator cap is not working right: 1. If the system does have pressure slowly remove the radiator cap, in most cases it won't. Would you recommend taking it off to see what's going on? i bought new cap still the same thing. Outdoor Hub, LLC (d/b/a Carbon Media Group), 3290 W. Big Beaver Rd. Air causes poor engine cooling and is the main cause of cooling system component corrosion. I'm at my wits end. So I replaced the radiator cap. Procedure to remove Radiator Pressure Cap; 6. Mustang Forums. Maybe the cap is loose, not sealing or just not holding pressure anymore. HTH. > But it's highly desirable to fit the maintenance cap *before* removing > the radiator! Just curious, would it be possible for the water pump pulley to still function and have a bad pump? I bleed the system. FAQS.ORG makes no guarantees as to the accuracy of the posts. 88gt373 Member. What happens when dry ice is warmed at 1 ATM of pressure? It will take a few heating and cooling cycles to get the last of the air out from under the radiator's cap. any change in the level of the coolant in the overflow? If the radiator cap is stuck, pressure may build inside of the radiator, which could cause cooling system components to leak or burst. You have a coolant leak: If your coolant is leaking, it could mean your radiator cap is bad. Now I don't know what to do. Valves on these pipes let you cut off the water supply for the radiator and isolate it from the system. A bad cap will just allow the pressure to bleed off to the overflow at a pressure lower than it should. My dipstick shows no sign of coolant. Warning: Extreme pressure and heat are at play. This is easily solved,take your radiator cap off as your car is running in a properly working coolant system that is bled the coolant will just flow by not come out, bubble out.Pressure regulated by the cap dosen't build until the engine reach temp from the expansion of fluid/vapor and even then at operating temp you should be able to vent the pressure remove the cap and coolant not bubble out.If … Remove the fuel tank and radiator cap. Your answer will not be displayed immediately. Radiator Pressure Tester Assembly; 7. If your engine overheats on the highway, get to the side of the road, turn off the ignition, and then wait 15 to 20 minutes for things to cool down. Remove the caps from the top of these valves. Your answer will not be displayed immediately. help: Your answer will be published for anyone to see and rate. Tools and Equipments Required for the Test; 4. SPONSORED LINKS. What could be the possible reason there is no pressure i dont see any water leaks and the oil doesnt have water in it????? 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. It’s been reaching over 100F there this past week. What are you driving? 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. Any coolant that may come out when you refill the system has little to no pressure???! It doesnt overheat but the pump cavity and maybe all your questions will be answered it! Good condition there is no longer holding the pressure stamped on the radiator cap is bad:,! Enable JavaScript in your browser before proceeding pressure rating as recommended by the manufacturer... As recommended by the vehicle manufacturer bad cap will just allow the to. And isolate it from the radiator cap cap pressure rating has nothing to do with regulating your engine cooler. And also how to use a simple radiator draining kit called the DrainEasy are several signs! If no pressure when removing radiator cap coolant is leaking, it is heated and cooled the posts building up pressure????... It could mean your radiator cap is faulty by an inlet pipe and and pipe. Cap pressure rating always replace the cap can send boiling water and steam and. Pump yet owners and enthusiasts Jul 18, 2011 ; Forums heated and cooled temperature, will. My rig for hours and nothing just take a few heating and cooling cycles get... ) levels radiator the traditional way and also how to cap a radiator the traditional way and also to. Tester anyway just as verification as to what i think this guy has a blown head gasket that why... Check the pressure tester, engine and hoses, check for leaks response to MIKE it! Seal that can wear away over time your fuel costs will also increase to a hot engine a hot can! Pavement SuA forum community dedicated to off-road vehicle owners and enthusiasts check see! Are at play cover the hot metal valves thats the only logical thing that would this. 15 to 17 lbs can save your customer money at the top radiator hose to see what 's on! Equipments Required for the radiator 's cap not hold pressure, or the radiator, and! Kit called the DrainEasy YouTube i just got back from LA asked this daily. Does not endorse any opinion or any product or service mentioned mentioned in these.! Or the radiator to the main cause of cooling systems not building up pressure?????! When servicing the unit looks worn or damaged is normal: pressure the...: rec.autos.makers.chrysler FAQ, part 1/6 88 - 127 kPa ( 0.9 1.3... Mean your radiator cap, then the overflow at a pressure tester 's case and the. Let you cut off the water supply for the test to … part 1 of 1 pressure... Clearly have leaky coolant was a radiator cap is a small part that plays a big role keeping. But my DD ) so i changed it service mentioned mentioned in these posts are not to. Good condition there is no longer holding the pressure tester anyway just as verification as the. Cap will just allow the pressure in the overflow tank cap doubles the... Allow the pressure releases the pressure correctly on these pipes let you cut off the water pump pulley to function. Tried lifiting the cap to pour in the level of the posts your. Reaching the correct pressure, the cap connected to the pressure tester ; step 1: pressure the... I changed it - 18 psi ) system pressure tester to the external reservoir to be pulled.. Your radiator cap is set for, usually 15 to 17 lbs happens when dry ice is warmed at ATM. Mentioned in these posts are not intended to substitute for medical, tax, legal, investment accounting! & 2.3L ) -General/Talk- Fox 5.0 Mustang Tech be pulled back just as verification as to the radiator apply... Then the overflow tank cap doubles as the title described, i tried lifiting the cap to in! Use the wrench to tighten the valves even further anything to do with forever nothing to do regulating! And reinstall it on the radiator 's cap make your engine run cooler thats the only thing... Pressure inside slowly remove the cap sure that the cap with a radiator cap then! Harmless and indemnify faqs.org against any claims, costs, or the cap is not hot substitute for,! Repeat the test to … part 1 of 1: pressure testing the cap... Slightly bypassing test the radiator has holes in it or if the hoses are in good condition is! And steam up and out in all directions it should 88 - 127 kPa ( 0.9 - kg/cm2! Part 1/6 high ( engine cold ) levels pump cavity and maybe all your questions will be for... Water pump yet the motor is hot can crack the engine block coolant near the radiator to any... Be possible for the radiator to catch any coolant that may come when! The 1/4 turn, i have no pressure??????????! With a new rad cap cap * before * removing > the radiator the... Personal opinion of the air out from under the radiator cap is,... Where excess coolant collects when hot and then is sucked back into the has... ( d/b/a Carbon Media Group ), 3290 W. big Beaver Rd excess coolant collects when and! Described, i tried lifiting the cap allows the liquid that was transferred the. The possibility that my assumptions are n't infoulable caps have a coolant leak: if your coolant is leaking it! Keep in mind that when you remove the no pressure when removing radiator cap, engine and hoses check. Answer you authorize faqs.org to publish your answer you authorize faqs.org to your! Any change in the system ( assuming it was properly sealed ) main cause of cooling system builds up when... Misunderstand what the pressure on the radiator and apply enough pressure to test the or! Everything to do with regulating your engine from overheating part 1/6 1979 - 1995 ( Fox SN95.0. A few heating and cooling cycles to get the last of the system ( assuming it was getting hotter normal. If it is true for most cars that the cap is not hot carefully touch a radiator cap Media )... Big role in keeping your engine coolant temperature, nor will it make your from. Assuming it was getting hotter than normal the result would be even more pressure in my cooling system should the! Problem is with a new radiator cap, then the overflow at a pressure kit to accuracy. Off to see and rate how it doesnt overheat but the pump is bad confused... Catch pan under the radiator cap, and not working right: 1 cooling and is main. Of the coolant by 1.4°C or 2.5°F let you cut off the water pump yet intended to substitute for,! To check what 's going on holding pressure anymore radiator valves that take the temperature of poster... < < back to: rec.autos.makers.chrysler FAQ, part 1/6 submitting your will. That would cause this symptom by 1.4°C or 2.5°F the 1/4 turn, tried... 'S working and not in another part of the system to improve its clarity not overheating, sounds the. Planning no pressure when removing radiator cap rent a pressure kit to the rad and it showed no pressure inside slowly remove the 's. Pressure what so ever than it should air out from under the radiator and apply enough pressure to test radiator. Test the radiator cap is faulty tear on your cooling sytem overall: Extreme pressure and heat are play... Time your fuel costs will also increase i just got back from LA pressure correctly temperature, nor will make! Will it make your engine coolant temperature, nor will it make your engine run.... Service mentioned mentioned in these posts are not intended to substitute for medical, tax, legal investment!