If the hoses are in good condition there is no worry about them bursting. 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. first with the truck off and cap on grab the top radiator hose and squeeze it. If … If it does exceed this pressure, it will release pressure into the overflow tank. if you hear air then theres a leak. I used 1/4" sockets in hopes of not breaking anything. Yes. The engine warms up normally, and does not overheat. I had placed the clamp over that dent, resulting in an incomplete seal. 84 Dodge 225 I just put on a new water pump and radiator cap. Meanwhile, higher pressures tear the hoses. 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. I put the new clamp much closer to the radiator, away from the dent. Recommended Services. 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. Monday, December 11th, 2017 AT 5:33 AM CECE18192004 MEMBER; Drove the car to the auto parts store which is less than two miles. Everything has been replaced with the cooling system except for the radiator. 5 Answers. So I have looked and see no leaks and no coolant in the oil so no clue why the overflow is losing coolant. 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. With a hot top hose and a cool lower hose, your rad. Adding 1/2 gallon is a lot; the rad. I'm not overheating at all. 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. i squeeze the radiator hose no pressure at all . 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. filler cap with the engine running, it would come out like a volcano, having no place to go. It seems to have fair heat but it will not build pressure. Small hose at top of radiator to recovery tank should be the Radiator overflow hose. Coolant pressure gauge holds at 12 psi. Improper circulation and overheating can occur without the essential function of these seals. A cold lower radiator hose will cause an overheating problem. The gauge consists of a pump and a gauge. They do lose their rating after years of use or sometimes they simply become too dirty to work. 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. I have also already got the air bubbles out. Filled with water/coolant and there are no leaks. radiator hose ready to burst. Why is there no pressure in the upper radiator hose? why is there no pressure when engine is hot and overheating 4 Answers. Lv 4. 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. Save Share. Still overheating. 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. Favourite answer. My car has 191400 miles. Temp gauge always reading low but coolant is low? Installed new water pump, thermostat, cap and radiator together. 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. Jump to Latest Follow 1 - 8 of 8 Posts. 30 km home, the temperature gauge did not go up, but there is no pressure in the rad hoses. 388 3. With electric fans check to see that the fan cycles on when the engine gets hot. The most common cause for radiator hose collapse is a vacuum issue caused by a faulty radiator cap. Try jumping the fan directly to the battery. Join the discussion . mailman. Problem is (or maybe it isnt a problem) there is no pressure in any of the rad hoses. Open Question. Was this . 1 decade ago . Wiki User Answered . Answer Save. My upper radiator hose keeps building alit of pressure and popping off and car loses coolant and overheats. I didn't check the lower one though Mar 7, 2010 #7. turbotalon31 Proven Member. 2) No providing the proper pressure and not raising the boiling point. Asked by Wiki User. Here is what I have done: No external leaks except from over pressure at cap. Is the coolant in the radiator low as well or only the overflow bottle? any solutions? Ask Your Own Chevy Question. 89 Merkur XR4Ti. 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. Torn hoses spray coolant at the engine bay and cause a reduction of coolant which leads to vehicle overheating. Palpating the hose, I noticed a dent in the rim of the round fitting on the radiator that fits into the radiator hose. Automotive Mechanic. I have no pressure in my upper radiator hose to the water pump, car overheats. I also see very little water movement when its up to temp. answer. Want Answer 0. 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. I checked with the scan tool and the coolant temp stays around 200 degrees. 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. If the fan fails to come on, check the fan motor wiring connections, relay and temperature sensor. Top Answer. 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. Last year I used some radiator sealer for what was a pin hole. 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 … 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. Suspect something funny with the heater bypass hose or … Replaced thermostat, replaced radiator cap, dumped coolant and added new, pressure check system- OK, oil looks ok and level not high. is working fine; if it was plugged, the temp would rise rapidly, and when you opened the rad. 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. Had this exact same situation with my last car, I think I can tell you the most direct answer. The system is designed to hold 16PSI. The upper radiator hose gets hot to the touch. There is no pressure in the radiator hoses and the heater air is mild/warmer than usual. control sensor, thermo. Could some of this be caused by a block in the radiator. When the engine is cold, the thermostat is closed, not allowing coolant to flow through the upper radiator hose. Roughly 4.25 gallons of coolant. On 2009-04-15 16:32, accident_prone247 wrote: theres some quick ways to check what's working and not working. check the lower 1 if its not hot try a new rad. 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. Cleaned everything up, installed new thermostat, flushed out heater core, and added new coolant. Continue with Facebook. 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. 2011-03-18 00:47:26 2011-03-18 00:47:26. have replaced: radiator, thermostat, temp. 4 years of experience. If that is flowing coolant and stopping that helps truck warm up properly it sounds like you need a new radiator. I changed radiator cap after reading that could be problem. The pressure gauge fastens to the radiator in place of the radiator cap. Low pressure creates a vacuum in the hose that has a collapsing effect to them. Hello, thank you for writing in. Thanks, Joe. Joined Jan 9, 2010. reading, Pennsylvania . Radiator pressure fluctuations due to a bad radiator cap cause hose warping. The cause of this varies with the main culprits being a leaked hose radiator pipe, a faulty thermostat or hindered coolant circulation. Having a pressure test performed on the radiator cap will help in diagnosing the problem. No pressure to top... Share on Facebook; Share on Twitter ; Share on Google+; Share on Pinterest; Share by Email × Question about 2003 Buick Rendezvous. With mechanical fans a faulty fan clutch, causes most overheating problems. Continue with Google. Sorry, but your head gasket is blown. No. The radiator hoses … Caps are rated around 14–16 psi. Chevy Mechanic: Joe, ASE Certified Technician replied 7 years ago. 12 13 14. They act to control the pressure, expansion, and flow of the coolant throughout the radiator system. A radiator cap is composed of three independent seals known as the main, the pressure and the return seals. 1 - 8 of 8 Posts. You will often see a pinpoint leak that only sprays coolant when the car is warmed up. Have you put a coolant pressure tester on the system yet to chevk for leaks? Rad was taken out, flushed and pressure tested, heater core was checked, another new thermostat was put in. Radiator caps almost always fail toward lesser pressure, not higher. And, then pressure test the cooling system and radiator cap. The hoses get hot - just no pressure. Pressurize the cooling system with a radiator pressure gauge and check for radiator fluid leaks. helpful? Posted by curt houze on Jul 13, 2012. No amount of tightening would have fixed that. Once the engine warms up, the thermostat opens, allowing coolant to pass through the hose at a high rate. No pressure to top radiator hose. Relevance. The engine is not overheating. Under normal circumstances, caps should release the negative pressure caused when an engine cools down and the liquid coolant contracts. Most of the time the pressure isn’t high enough to rip the hose in half. The radiator is working properly I believe. Radiator hoses have no pressure. Inspect the upper and lower radiator hoses, the seams surrounding the water pump, the thermostat elbow and the radiator itself. I got the classic my-engine-is-overheating problem. Step 3. I also noticed that the lower section of radiator and lower hose is not getting hot. Reply. 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 already changed the water pump and the thermostat. 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