C ... that's all I have ever used in the Texas heat.. x2 on checking the pressure, they do rent tools.. JJ 85-SS 95-LT1-383 4L60 8.5-3.73 my old lost in the upgrade Gallery. Palpating the hose, I noticed a dent in the rim of the round fitting on the radiator that fits into the radiator hose. The system is designed to hold 16PSI. I was checking out the engine today and it noticed that as the engine got more and more hot, there would be no pressure in the radiator tubes. Why is there no pressure in the upper radiator hose? 388 3. The hoses get hot - just no pressure. Chevy Mechanic: Joe, ASE Certified Technician replied 7 years ago. Adding 1/2 gallon is a lot; the rad. Low pressure creates a vacuum in the hose that has a collapsing effect to them. any solutions? A cold lower radiator hose will cause an overheating problem. The engine is not overheating. There is no pressure in the radiator hoses and the heater air is mild/warmer than usual. Sounds like the radiator is clogged. Pressurize the cooling system with a radiator pressure gauge and check for radiator fluid leaks. I used 1/4" sockets in hopes of not breaking anything. Last year I used some radiator sealer for what was a pin hole. Answer. If you have the correct cap, it's running about 15psi, it's just that the hose has a lot of internal area for the pressure to work against, so it seems like it's higher than 15psi would feel like. I have no pressure in my upper radiator hose to the water pump, car overheats. SPONSORED LINKS. Asked by Wiki User. The cause of this varies with the main culprits being a leaked hose radiator pipe, a faulty thermostat or hindered coolant circulation. Top Answer. The are the upper and lower radiator hoses are very hard and the lower radiator hose and bottom of the radiator is cold to the touch even after driving. Most of the time the pressure isn’t high enough to rip the hose in half. Temp gauge always reading low but coolant is low? I drove it approx. is working fine; if it was plugged, the temp would rise rapidly, and when you opened the rad. why is there no pressure when engine is hot and overheating 4 Answers. Thanks, Joe. 2) No providing the proper pressure and not raising the boiling point. Coolant pressure gauge holds at 12 psi. I'm not overheating at all. I put the new clamp much closer to the radiator, away from the dent. Radiator caps almost always fail toward lesser pressure, not higher. control sensor, thermo. helpful? Inspect the upper and lower radiator hoses, the seams surrounding the water pump, the thermostat elbow and the radiator itself. Here is what I have done: No external leaks except from over pressure at cap. Want Answer 0. I changed radiator cap after reading that could be problem. With electric fans check to see that the fan cycles on when the engine gets hot. When it got super hot, the upper radiator hose would get hot, but i'm guessing it was from the steam, cause' there was no water pressure inside. Join the discussion . Relevance. I checked with the scan tool and the coolant temp stays around 200 degrees. If your radiator hose is hot (indicating coolant is flowing) but has no pressure after teh engine has been running for a while there is one of 2 things happening: either there is a leak in the cooling system that is preventing it from pressurizing, or the cap is faulty and not sealing properly. 30 km home, the temperature gauge did not go up, but there is no pressure in the rad hoses. Temp on upper hose is 180-200, lower hose 150-160 when engine is at temp and normal so radiator seems OK. Hoses feel stiff when hot. If the fan fails to come on, check the fan motor wiring connections, relay and temperature sensor. Meanwhile, higher pressures tear the hoses. 2011-03-18 00:47:26 2011-03-18 00:47:26. If the hoses are in good condition there is no worry about them bursting. 89 Merkur XR4Ti. Wiki User Answered . If … answer. have replaced: radiator, thermostat, temp. Three of the ways a radiator cap can cause overheating are, 1) Not holding in pressure and allowing the coolant to vent out or escape the cooling system. Rad was taken out, flushed and pressure tested, heater core was checked, another new thermostat was put in. The upper radiator hose gets hot to the touch. Lv 4. So I pulled the lower radiator hose to drain out the system since I was taking out the radiator to clean the oil off of it. Everything has been replaced with the cooling system except for the radiator. I had placed the clamp over that dent, resulting in an incomplete seal. Sorry, but your head gasket is blown. 84 Dodge 225 I just put on a new water pump and radiator cap. Replaced thermostat, replaced radiator cap, dumped coolant and added new, pressure check system- OK, oil looks ok and level not high. I have ran the car for 2 days now and it never overheats but even after the T stat should obviously be open there is no pressure in the hoses. And the one that really baffles me is the overflow bottle will lose coolant after a few days. When the engine is cold, the thermostat is closed, not allowing coolant to flow through the upper radiator hose. They do lose their rating after years of use or sometimes they simply become too dirty to work. The engine warms up normally, and does not overheat. Hello, thank you for writing in. Also, since the engine was changed, the air bag light is on all the time, and the headlight light flashes when they are not on. Monday, December 11th, 2017 AT 5:33 AM CECE18192004 MEMBER; Drove the car to the auto parts store which is less than two miles. Joined Jan 9, 2010. reading, Pennsylvania . If that is flowing coolant and stopping that helps truck warm up properly it sounds like you need a new radiator. Cooling Fans. Improper circulation and overheating can occur without the essential function of these seals. The gauge consists of a pump and a gauge. Radiator hoses have no pressure. Problem is (or maybe it isnt a problem) there is no pressure in any of the rad hoses. Could some of this be caused by a block in the radiator. Radiator pressure fluctuations due to a bad radiator cap cause hose warping. No amount of tightening would have fixed that. 12 13 14. The radiator was designed to be pressurized, so should the radiator cap fit incorrectly, improperly fitting, or maybe it is not the correct cap for your radiator, either way pressure will end up being lost and this let go very long could also create damage to a hose, causing even more repairs to be done. Answer Save. With mechanical fans a faulty fan clutch, causes most overheating problems. I also see very little water movement when its up to temp. You can then do a visual inspection of the engine bay to see if the overheating issue was caused by a bad hose, loss of coolant pressure, leaky radiator, or bad fan. radiator hose ready to burst. I also noticed that the lower section of radiator and lower hose is not getting hot. And, then pressure test the cooling system and radiator cap. 1 decade ago . cap and thermostat and not all bad headgaskets leak into the oil some leak external best way to find out is a compression test chris 91 … Continue with Facebook. No. Favourite answer. if you hear air then theres a leak. Automotive Mechanic. Yes. check the lower 1 if its not hot try a new rad. Once the engine warms up, the thermostat opens, allowing coolant to pass through the hose at a high rate. No pressure to top... Share on Facebook; Share on Twitter ; Share on Google+; Share on Pinterest; Share by Email × Question about 2003 Buick Rendezvous. I didn't check the lower one though Mar 7, 2010 #7. turbotalon31 Proven Member. Under normal circumstances, caps should release the negative pressure caused when an engine cools down and the liquid coolant contracts. Torn hoses spray coolant at the engine bay and cause a reduction of coolant which leads to vehicle overheating. My car has 191400 miles. mailman. Is the coolant in the radiator low as well or only the overflow bottle? I have already changed the water pump and the thermostat. With a hot top hose and a cool lower hose, your rad. On 2009-04-15 16:32, accident_prone247 wrote: theres some quick ways to check what's working and not working. If it does exceed this pressure, it will release pressure into the overflow tank. Open Question. Try jumping the fan directly to the battery. Reply. Small hose at top of radiator to recovery tank should be the Radiator overflow hose. Filled with water/coolant and there are no leaks. Roughly 4.25 gallons of coolant. I have also already got the air bubbles out. Cleaned everything up, installed new thermostat, flushed out heater core, and added new coolant. Caps are rated around 14–16 psi. A radiator cap is composed of three independent seals known as the main, the pressure and the return seals. Had this exact same situation with my last car, I think I can tell you the most direct answer. Have you put a coolant pressure tester on the system yet to chevk for leaks? I got the classic my-engine-is-overheating problem. Still overheating. Suspect something funny with the heater bypass hose or … Posted by curt houze on Jul 13, 2012. Ask Your Own Chevy Question. No pressure to top radiator hose. Collapsing bottom radiator hose: Occasionally, a bottom radiator hose begins to collapse under the vacuum that the water pump creates, and the impaired circulation causes overheating. You will often see a pinpoint leak that only sprays coolant when the car is warmed up. The top hose does build up pressure on it but the new pressure release radiator cap is cold when there is pressure on the hose. i squeeze the radiator hose no pressure at all . They act to control the pressure, expansion, and flow of the coolant throughout the radiator system. So I have looked and see no leaks and no coolant in the oil so no clue why the overflow is losing coolant. 5 Answers. 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. The radiator is working properly I believe. Recommended Services. Like caps, tanks, and hoses, radiators live a hard life of high pressure and heat, with the added bonus of being right out front where they can be hit by rocks, small animals, and other debris. The pressure gauge fastens to the radiator in place of the radiator cap. 1 - 8 of 8 Posts. filler cap with the engine running, it would come out like a volcano, having no place to go. Jump to Latest Follow 1 - 8 of 8 Posts. If you experience this, you should turn off the car’s engine immediately and identify the cause of the leaks. 4 years of experience. If a radiator corrodes internally or has minor exterior damage it may begin to leak only when the engine is running and at normal operating temperature. Installed new water pump, thermostat, cap and radiator together. If pressure in the cooling system is too high, you are likely to see one or more hoses start to spray coolant all over the engine bay. Continue with Google. The radiator cap used to be used to hold the pressure in the radiator and only flow through that small hose if it overheats and overflows. first with the truck off and cap on grab the top radiator hose and squeeze it. Save Share. Step 3. Having a pressure test performed on the radiator cap will help in diagnosing the problem. Car is overheating Inspection : $79.99 - $89.99: Get a Quote: Jessica Howe. 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