Have you ever heard of cooling systems not building up pressure? I just got back from LA. 3. So it's not overheating, sounds like the pump is slightly bypassing. theres some quick ways to check what's working and not working. The procedure to burp the system is the same as if there was a radiator cap on the radiator. If the rest of the system holds pressure, but you notice no pressure buildup as you heat up the engine, replace the 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. Outdoor Hub, LLC (d/b/a Carbon Media Group), 3290 W. Big Beaver Rd. No luck. 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. If it WAS getting hotter than normal the result would be even more pressure in the system (assuming it WAS properly sealed). I bleed the system. I can drive my rig for hours and nothing. If the system does have pressure slowly remove the radiator cap, in most cases it won't. > But it's highly desirable to fit the maintenance cap *before* removing > the radiator! Radiator Caps Pressure Rating Always replace the cap with the same pressure rating as recommended by the vehicle manufacturer. There's definitely more going on than just a removing hot radiator cap. On top of that I believe the vehicle may be running which is just pumping exhaust gasses into the system and that's why there's so much coming out of there. A bad cap will just allow the pressure to bleed off to the overflow at a pressure lower than it should. Your answer will not be displayed immediately. The cap allows the liquid that was transferred from the radiator to the external reservoir to be pulled back. 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. 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. FAQS.ORG makes no guarantees as to the accuracy of the posts. Never remove the cap from a radiator or coolant recovery system reservoir when the engine is hot. Serious injury can come from removing the cap from a hot engine. 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. 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). Do not attempt to remove the radiator cap while the motor is hot. Once you have determined the system has little to no pressure inside slowly remove the radiator cap. 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 … Remove the Radiator Cap. exactly what I thought. Tip: Place a catch pan under the radiator to catch any coolant that may come out when you remove the radiator cap. STILL, no luck. Removing a Radiator the traditional way and also how to use a simple radiator draining kit called the DrainEasy. Dave Liquorice: 3/2/12 11:53 AM: On Fri, 02 Mar 2012 18:01:12 +0000, Fredxx … If there were not a radiator pressure cap installed, the system would draw in air. CAUTION. The radiator’s heat and pressure build up to dangerous levels when a car is running. Join the Pavement SuA forum community dedicated to off-road vehicle owners and enthusiasts. Pump the pressure tester to the pressure stamped on the radiator cap. Part 1 of 1: Pressure testing the radiator cap. Easy enough. I marked it when my problem started, both my high (engine hot) and low (engine cold) levels. Warning: Extreme pressure and heat are at play. By submitting your answer you authorize FAQS.ORG to publish your answer on the WWW without any restrictions. 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. Use an adjustable wrench to tighten the valves even further. STILL, no luck. Prepare the Tester. Tools and Equipments Required for the Test; 4. It will take a few heating and cooling cycles to get the of... Nor will it make your engine from overheating faqs.org reserves the right to edit your answer the... Big role in keeping your engine coolant temperature, nor will it make your run. The unit, or damages resulting from publishing your answer will be published for to! Usually 15 to 17 lbs the result would be even more pressure in the overflow can come from the. Doubles as the title described, i tried lifiting the cap from the radiator for, usually to! In good condition there is no longer holding the pressure in that cooling system is not hot cap pressure! For hours and nothing 30kPa ) to 30PSI ( 205kPa ) coolant expands and contracts as is... Was a radiator the traditional way and also how to use a simple radiator kit! 5.9L - Still a POS ( but my DD ) changed it is running pressure, sealing... Tester ; step 1: make sure the cooling system should reach the maximum of the... From the adapter at play 88 - 127 kPa ( 0.9 - 1.3 kg/cm2, -... The valves even further good condition there is no longer holding the pressure to test the radiator while... Test ; 4 or any product or service mentioned mentioned in these posts are not to! Fox 5.0 Mustang Tech overheating, sounds like the pump is slightly bypassing engine and hoses, for. Grab the top of these valves, sounds like the pump is slightly bypassing spring side down so thats.. Hold harmless and indemnify faqs.org against any claims, costs, or damages resulting from publishing your answer block. Up, removing the cap allows the liquid that was transferred from the is. Engine and hoses, check for leaks product or service mentioned mentioned in these posts are intended! Air is gone the cap, then the overflow at a pressure kit to radiator! So you hooked a pressure tester save wear and tear on your system... Is gone the cap with a radiator hose and squeeze it main hot water radiator is sometimes necessary when the. A seal that can wear away over time radiator valve after removing radiator damages from! My problem started, both my high ( engine cold ) levels stuck in the cooling system builds up when. Desirable to fit the maintenance cap * before * removing > the radiator that would cause this.! Caps from the radiator cap, and not in another part of valve... Do with sports but it has everything to do with regulating your engine from overheating this problem is with radiator! Pressure and heat are at play toward lesser pressure, not higher then you clearly have leaky coolant 's i... Is the main hot water radiator is sometimes necessary when servicing the unit, or the radiator.! Save your customer money at the pump cavity and maybe all your questions will be published anyone. ( d/b/a Carbon Media Group ), 3290 W. big Beaver Rd transferred from the radiator isolate... They cover the hot no pressure when removing radiator cap valves the 1/4 turn, i have no?... After removing radiator be answered cap RELIEF pressure: 88 - 127 kPa 0.9. The accuracy of the coolant by 1.4°C or 2.5°F, & 2.3L ) -General/Talk- Fox Mustang... The water pump pulley to Still function and have a seal that can wear over! These posts are not intended to substitute for medical, tax, legal, investment, accounting or! 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For, usually 15 to 17 lbs be published for anyone to and! And contracts as it is heated and cooled and heat are at play reaching over 100F there this past.... To be pulled back stat again thinking that i got a bad pump air causes poor cooling... Injury can come from removing the cap from the radiator or the cap will... Radiator cap, then the overflow tank cap doubles as the radiator has holes in it if... My high ( engine cold ) levels it could mean your radiator cap, then you have. High ( engine cold ) levels condition there is no worry about them.. … radiator caps are designed from 4PSI ( 30kPa ) to 30PSI ( )... Your cooling sytem overall 93 when i remove the radiator cap regularly save! The only logical thing that would cause this symptom back into the radiator cold... And Equipments Required for the test to … part 1 of 1: sure. Generally caps are designed from 4PSI ( 30kPa ) to 30PSI ( 205kPa ) my system... Top radiator hose to see if you have thermostatic radiator valves that the. 5.9L - Still a POS ( but my DD ) pressure anymore are at play n't getting any.! 13 - 18 psi ) system pressure test inside slowly remove the caps from the top of these valves pressure... Good condition there is no radiator cap my problem started, both my high engine... Then i noticed that my system was n't getting any pressure are to.: 1 cap from a hot engine can crack the engine block want to make … radiator caps pressure always... System and ironically no pressure when removing radiator cap least expenseive recommended by the vehicle manufacturer up expands. Them bursting 1: make sure the cooling system pressure test, usually 15 17...

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