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. 30 km home, the temperature gauge did not go up, but there is no pressure in the rad hoses. Chevy Mechanic: Joe, ASE Certified Technician replied 7 years ago. Want Answer 0. 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. The engine warms up normally, and does not overheat. And the one that really baffles me is the overflow bottle will lose coolant after a few days. The hoses get hot - just no pressure. Radiator pressure fluctuations due to a bad radiator cap cause hose warping. Car is overheating Inspection : $79.99 - $89.99: Get a Quote: Jessica Howe. With mechanical fans a faulty fan clutch, causes most overheating problems. A radiator cap is composed of three independent seals known as the main, the pressure and the return seals. Cooling Fans. control sensor, thermo. Continue with Google. have replaced: radiator, thermostat, temp. The most common cause for radiator hose collapse is a vacuum issue caused by a faulty radiator cap. Problem is (or maybe it isnt a problem) there is no pressure in any of the rad hoses. any solutions? Once the engine warms up, the thermostat opens, allowing coolant to pass through the hose at a high rate. Top Answer. check the lower 1 if its not hot try a new rad. Radiator caps almost always fail toward lesser pressure, not higher. Radiator hoses have no pressure. No pressure to top radiator hose. You will often see a pinpoint leak that only sprays coolant when the car is warmed up. Torn hoses spray coolant at the engine bay and cause a reduction of coolant which leads to vehicle overheating. Joined Jan 9, 2010. reading, Pennsylvania . If you experience this, you should turn off the car’s engine immediately and identify the cause of the leaks. 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. Join the discussion . The upper radiator hose gets hot to the touch. Temp gauge always reading low but coolant is low? I got the classic my-engine-is-overheating problem. I changed radiator cap after reading that could be problem. The radiator is working properly I believe. Improper circulation and overheating can occur without the essential function of these seals. No amount of tightening would have fixed that. filler cap with the engine running, it would come out like a volcano, having no place to go. Last year I used some radiator sealer for what was a pin hole. Under normal circumstances, caps should release the negative pressure caused when an engine cools down and the liquid coolant contracts. If it does exceed this pressure, it will release pressure into the overflow tank. Automotive Mechanic. If the fan fails to come on, check the fan motor wiring connections, relay and temperature sensor. 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. The system is designed to hold 16PSI. Roughly 4.25 gallons of coolant. Adding 1/2 gallon is a lot; the rad. Save Share. 89 Merkur XR4Ti. I checked with the scan tool and the coolant temp stays around 200 degrees. Ask Your Own Chevy Question. 84 Dodge 225 I just put on a new water pump and radiator cap. My upper radiator hose keeps building alit of pressure and popping off and car loses coolant and overheats. Asked by Wiki User. 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 … SPONSORED LINKS. I put the new clamp much closer to the radiator, away from the dent. Had this exact same situation with my last car, I think I can tell you the most direct answer. A cold lower radiator hose will cause an overheating problem. 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. I have already changed the water pump and the thermostat. Step 3. 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 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. Everything has been replaced with the cooling system except for the radiator. No. 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. There is no pressure in the radiator hoses and the heater air is mild/warmer than usual. Relevance. It seems to have fair heat but it will not build pressure. I drove it approx. If the hoses are in good condition there is no worry about them bursting. Is the coolant in the radiator low as well or only the overflow bottle? I had placed the clamp over that dent, resulting in an incomplete seal. 2011-03-18 00:47:26 2011-03-18 00:47:26. The engine is not overheating. 388 3. Jump to Latest Follow 1 - 8 of 8 Posts. And, then pressure test the cooling system and radiator cap. Monday, December 11th, 2017 AT 5:33 AM CECE18192004 MEMBER; Drove the car to the auto parts store which is less than two miles. Coolant pressure gauge holds at 12 psi. 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. 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. Sounds like the radiator is clogged. Low pressure creates a vacuum in the hose that has a collapsing effect to them. 4 years of experience. is working fine; if it was plugged, the temp would rise rapidly, and when you opened the rad. Suspect something funny with the heater bypass hose or … Most of the time the pressure isn’t high enough to rip the hose in half. 1 - 8 of 8 Posts. Wiki User Answered . So I have looked and see no leaks and no coolant in the oil so no clue why the overflow is losing coolant. Thanks, Joe. Yes. I have also already got the air bubbles out. Have you put a coolant pressure tester on the system yet to chevk for leaks? 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. I also noticed that the lower section of radiator and lower hose is not getting hot. Replaced thermostat, replaced radiator cap, dumped coolant and added new, pressure check system- OK, oil looks ok and level not high. Having a pressure test performed on the radiator cap will help in diagnosing the problem. answer. mailman. Inspect the upper and lower radiator hoses, the seams surrounding the water pump, the thermostat elbow and the radiator itself. They act to control the pressure, expansion, and flow of the coolant throughout the radiator system. Filled with water/coolant and there are no leaks. 5 Answers. Open Question. 2) No providing the proper pressure and not raising the boiling point. The radiator hoses … Was this . With a hot top hose and a cool lower hose, your rad. I'm not overheating at all. On 2009-04-15 16:32, accident_prone247 wrote: theres some quick ways to check what's working and not working. Still overheating. if you hear air then theres a leak. Why is there no pressure in the upper radiator hose? Small hose at top of radiator to recovery tank should be the Radiator overflow hose. 1 decade ago . Reply. Try jumping the fan directly to the battery. The pressure gauge fastens to the radiator in place of the radiator cap. Lv 4. Favourite answer. My car has 191400 miles. Posted by curt houze on Jul 13, 2012. Here is what I have done: No external leaks except from over pressure at cap. Caps are rated around 14–16 psi. Cleaned everything up, installed new thermostat, flushed out heater core, and added new coolant. Installed new water pump, thermostat, cap and radiator together. I used 1/4" sockets in hopes of not breaking anything. radiator hose ready to burst. 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. Continue with Facebook. 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. If that is flowing coolant and stopping that helps truck warm up properly it sounds like you need a new radiator. Rad was taken out, flushed and pressure tested, heater core was checked, another new thermostat was put in. When the engine is cold, the thermostat is closed, not allowing coolant to flow through the upper radiator hose. The cause of this varies with the main culprits being a leaked hose radiator pipe, a faulty thermostat or hindered coolant circulation. Pressurize the cooling system with a radiator pressure gauge and check for radiator fluid leaks. why is there no pressure when engine is hot and overheating 4 Answers. 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 squeeze the radiator hose no pressure at all . 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. Meanwhile, higher pressures tear the hoses. Palpating the hose, I noticed a dent in the rim of the round fitting on the radiator that fits into the radiator hose. first with the truck off and cap on grab the top radiator hose and squeeze it. helpful? With electric fans check to see that the fan cycles on when the engine gets hot. Answer. 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