im thinking its time to change the upper radiator hose since its soft and it tends to expand a little when it has pressure. 595 Posts . Replaced it twice, second one i actually tested in water to make sure it was operating correctly, and it is. You can usually see most of this hose. Post Reply. When it does this coolant begins to pour out of the fill reservoir, if I put the cap on and open up the bleed valve it just spews steam. The upper hose was hot, but the lower was cold. A couple of times a week, the temp runs up and back down. My 2006 Outback with 82,000 miles is simultaneously overheating while not sending hot air to the heater. Remove the upper rad hose and there are 3 10mm bolts holding the assembly on the head. Lower radiator hose cold, no matter what I do to the cooling system, the hose it will not warm up or get as hot as the upper radiator hose or the heater core hoses. The top radiator hose is usually but not always the location of the thermostat. My lower hose is rather cold while the upper hose is hot. I have a 1991 Ford Ranger 2.9,and I am having a heat problem I did change the thermostat but no heat yet,this is what I found so far. - Lower rad hose stone cold and and stat housing cold. - Didn't check the J Plug (didn't know it existed at time of stat replacement). By Anonymous (not verified) 20 / Mar / 2014 . I checked top radiator and its hot,the bottom hose on radiator is cold. I just picked up a 1998 Dodge Ram 1500 5.2 with 100K on it, I have driven it and let it warm up to operating temp, and I notice that the radiator cap (which I just replaced) is bone cold, and the upper radiator hose is hot, while bottom one is cold. Squeeze the upper and lower hoses to burp the system. Car is still overheating. cold lower radiator hose. If your engine is at normal operating temperature, then your thermostat may not be opening as it should if the bottom hose remains cold. Radiator steaming but not overheating (yet) 2001 Honda Civic. I had a bad thermostat and a bad radiator that I replaced a week ago. So i replaced the expansion tank, upper radiator hose and the top cap last week. Hot upper radiator hose , cold lower hose 1 Answer. The upper radiator hose runs from the radiator to the motor. Removed upper & lower rad hoses, & ran water into the rad inlet, & observed good flow coming out of the rad outlet. Then it started running hot, and I noticed my fans wouldn't come on unless the A/C was turned on. The lower radiator hose should always be cooler than than the upper hose. Discussion in '2nd Gen. Tacomas (2005-2015)' started by Larzzzz, Apr 19, 2014. Radiator Probs: Upper hose hot, lower hose cold. This one appears to be the lower radiator hose leaking (I really hope it's not the radiator). Could it be possible that I have trapped air in the lower hose near the thermostat or do you think that a thermostat felt it was being neglected and wanted to … the drivers side of the radiator is also warm/hot. The upper rad hose is hot, Bottom is cold. The lower hose should be cooler than the top, but not cold. and the heat gets really hot. Once the thermostat opens, the lower hose will warm, but to a point less hot than the upper hose. My car has an automatic transmission. Either-way, the top hose gets hot after the thermostat has opened. Apr 19, 2014 at 3:15 PM #1 #1. 4. hand check the upper rad hose. 3-turn the heater on high my upper radiator hose gets hot and is pressurized once my thermostat opens. Fluid in the radiator is high, upper hose is hot but lower hose stays cold. It also contains a lubricant and anti-corrosive properties. Is this normal? The engine temp gauge is at the middle, so I guess nothing is overheating. Anyway, while trying to find the source of my leak I discovered that the lower hose is cold to the touch. Find both of your radiator hoses. I recently replaced the thermostat and new antifreeze. I removed the thermostat housing, pulled the thermostat and boiled it … My upper hose is hot but the lower hose is cold. If upper hose hot and lower hose cold or warm then you might have stuck close or prtially closed thermostat , difference between lower and upper hoses when t/stat works ok is about 10-15 degrees, not really noticeable for hand.So if you don't feel a lot of difference between hoses temp. It may happen that your car might get low on coolant and is not able to reach the lower radiator. - Heater core return hose warm only. If the engine has reached warmup temp say 180 or so and the upper rad hose is COLD or lukewarm..the thermostat is stuck.. replace it. Radiator hoses are a vital part of the cooling system that carry hot coolant from the engine through the radiator and circulate it back — cooler — to the engine again. There are two hoses, the upper and lower, and they’re thick and sturdy enough to handle both high pressures and immense heat. On the hoses, the return hose from the radiator will not be hot, especially in cold weather, as the radiator is supposed to bring the coolant down to a usable temperature for cooling the engine. I do not see a weep hole on the water pump but I am not loosing any antifreeze. Replaced the two plastic elbows under the tensioner bracket.. 3.8L 2003 Buick Temp says normal but climbs to 212 on dash gauge.. top hose extremely hot and lower hose almost cold to touch. My lower radiator hose stays cool to cold even when the car is fully warmed up. I have a 2001 vw jetta tdi. Last edited by K Fox; 12-16-2013 at 03:40 PM . no coolant or oil mix or the other way around no bubbles in the resivor tank no coolant leak just a little oil leak from oil separator and coolant level is always normal not loosing any. So based I what I found, outside temps and heater being used or not, appear to have a factor on whether the lower hose is cold, warm or hot. If you want to have this issue diagnosed before moving forward with any repairs, a technician from YourMechanic can come to your home or office to inspect your car and let you know what adjustments should be made. Okay. After the engine has warmed up (as warm as it is going to get), the upper radiator hose is hot, the heater core hoses are hot, the little bypass hose is hot, the lower radiator hose is cold/barely warm. The thermostat was not an oe one but I have great heat and my gage reads 190. THE BAD: - Only warm cabin heat from vents (livable). Now the heater is putting out great heat, temp gauge reads normal, but the lower rad hose is still ice cold. Lack of Coolant in the Engine The coolant is elated in and out of the radiator by upper and lower hoses. I'v recently cahnged t-stat, got new radiator cap, bled and refilled. One reason radiator hoses are overlooked during a routine car inspection is that the hoses can be difficult to reach. Q: My car is overheating my upper radiator hose is hot but my lower is cold and my radiator fan is not kicking on.. Help My car has 225000 miles. Discussion Starter • #1 • Jan 19, 2008. when i feel the lower radiator hose, it is cold but its somewhat pressurized. I had just driven about 30 miles. My bet is the thermostat, but your radiator could be clogged too. IF the upper rad hose is hot to the touch, hot coolant IS flowing through the open thermostat to the rad.. a simple but effective test. ... (226 deg F) and lower the freezing point of the coolant (-34 deg F). the passenger side of the radiator is cold too. Thus, making the lower radiator hose to heat up. Bled the system like 3 times for 10 mins each time. 2-start the engine and let it idle. As a result, the lower hose emits cold air. You can leave the cap off, Start the car, alternating squeezing the hoses. Still doing the same thing. There is a primary and secondary. First Let me say I had issues with my radiator cap. Not counting when the A/C or defrost function is On, the fans come on when the radiator alone is unable to lower the temperature of the coolant enough to maintain the engine temperature in the normal range. the 2 hoses running to the heater core are hot. Okay. My lower radiator hose had always stayed cold and I thought my t-stat stuck closed so I ordered a new t-stat from pelicanparts and had it replaced. The lower hose will also be cold, again because there is little coolant flow, and what there is, is coming from the (cold) radiator. It will need replacing. , and fan is not on , check fan or fan clutch itself. it gets up to regular temp. Drivers side of motor, follow the upper radiator hose to a VERY VERY STUPID plastic housing that has both Tstats in it. My experience with this is that its the thermostat. Is it the waterpump … read more Result: COLD hose; after 15 minutes of more driving this time with NO heat, lower hose is HOT. After awhile it gets hot, fills the Overflow bottle, and starts to get hot since its running low on coolant. Hey peeps, I'm having major overheating issues with my 2004 bmw 325i e46. Just open the upper tank cap, fill it up slowly. The top side of the radiator (upper hose area) is very hot, the opposite side (lower hose) is cold. Looked over the cooling system, and everything looked great. The lower radiator hose … - Top rad hoses, expansion tank small hose, top hard pipe, heater core inlet hose, lower hard pipe all hot. It started when my heater wouldn't blow hot while engine was normal temp. All of the hoses get hot, with the exception of the lower rad. Outside air temperature was about 35. Coolant level is fine. no smoke of … The upper hose transports hot coolant from the engine to pass through the radiator, while the lower hose transported the cooled coolant from the radiator into … Truck is not overheating, it has great heat, I would sweat to death if I left it on too long. the lower wont be as hot as the upper.. it sounds as if you may have air in the system,,,lets try bleeding it this way 1,you need to remove the radiator/reservoir cap when engine is cold. I quickly replaced the cap. The engine was up to temp. When you do this get a new O-ring for the inlet from the water pump. The radiator cap is also cold but like I said there was great heat and both of those hoses were also very hot. The radiator can be checked for hot and cold spots when it is running to see if it has plugged passages and needs replacement. 2003 Ford Ranger 4 Cyl 2.3 Why does the upper radiator hose stay hot while the lower hose along with radiator is cold with no heat in dash after replacement of bad water pump …
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