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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: ChevyRay07 on February 03, 2014, 07:23:42 pm
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Top radiator hose going into the engine is hard after I run the truck. Has a rebuilt 350 and it just started doing it so I'm trying to figure what it is.
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Is the engine overheating? Is the radiator full of coolant? Did you install a new radiator cap?
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No it's not over heating and yeah I did put a new radiator cap cause the old one would leak antifreeze out. And it's full of antifreeze and I just changed the thermostat.
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did you flush the system when you changed the thermostat?
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No I left the same thing on there cause it just started doing it today
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No it's not over heating and yeah I did put a new radiator cap cause the old one would leak antifreeze out. And it's full of antifreeze and I just changed the thermostat.
Your old cap was leaking. The new cap is maintaining cooling system pressure at ~15 lbs. Stiffness in the hose at operating temp is normal.
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So it's fine that the pressure on the hose normal then it's working just fine?
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And the end of the hose that's on the radiator steam comes out of it is it normal the weather here is 39.
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Pressure in the cooling system raises the boiling point of the coolant. As long as the engine is not overheating, the cooling system is full and not losing coolant (you're not having to add), pressure building in the radiator means the cap is doing its job. But, you need to explain this in a little more detail...
And the end of the hose that's on the radiator steam comes out of it is it normal the weather here is 39.
Are you referring to the 5/16" bib just below the cap that runs to the recovery tank? What?
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If the hose is leaking "steam" that isn't normal.
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No the top hose that runs from radiator to motor. Where the thermostat is at.
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it shouldn't have steam coming out. i would suggest letting the engine cool. then removing the radiator cap and cranking it and then check the coolant level with it running to make sure its full and there isn't any air in it. nothing should come from that hose, you might want to check it around the thermostat housing make sure the hose isn't brittle of squishy (like a water balloon) also check your clamp you may need a new one or its possible you could have over tightened it and pinched a hole in it.
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sounds lke you have your heater core by passed?
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IM about to upload some pics of the radiator to help id
edit:
this is how ive always seen the hoses ran
1. goes to over flow tank
2. heater core (un less by passed) if heater core is by passed it goes the the intake left of the thermostat housing #1 in next pic
3. transmission lines
4. water pump.
on the driver side there is only one hose that goes to the thermostat housing #2 in next pic
(http://i1269.photobucket.com/albums/jj582/josh_brooks2/IMG_20140203_205009_485.jpg) (http://s1269.photobucket.com/user/josh_brooks2/media/IMG_20140203_205009_485.jpg.html)
(http://i1269.photobucket.com/albums/jj582/josh_brooks2/IMG_20140203_205048_271.jpg) (http://s1269.photobucket.com/user/josh_brooks2/media/IMG_20140203_205048_271.jpg.html)
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Ok. What's a heater core bypass. I did cranked it up and it was full while it was on.
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heater core by pass is just where instead of running coolant threw the heater core you run the hose straight from the engine to the radiator
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If it's 'steaming' from around the hose connection to the t-stat housing, check the hose clamps. The aluminum water outlets have a tendency to corrode and build aluminum salt between the rubber and the housing, causing seepage. Hot coolant vapor on a cold day may condense and appear to be steam. Are you sure it's not just a leak, or is it blowing out?
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The steam is coming out the other side of the radiator where the hose is connected to the thermostat.
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ok is it coming from between the hose and the radiator snout or out of the radiator itself?
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Its blowing out cause there's no antifreeze coming out from there it's dry, and it seems to be coming out from between.
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there isnt any coolant in the upper hose?
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probably the same thing bd is talking about. there is probably crud built up in that connection. i would take the hose off inspect it for any damage clean the inside of it and also clean the radiator snout and put it back on. you should have coolant in the upper hose though
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Yeah there is. When I changed the thermostat theres coolant there. So it may just be that's it has crud and needs to be cleaned out and put back on tightly. Also my radiator cap has a safety and I pull up it releases all the pressure so is that normal
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Its blowing out cause there's no antifreeze coming out from there it's dry, and it seems to be coming out from between.
Is the radiator full of coolant right up to the cap?
If you find a lot of crud built up on the thermostat housing then replace it along with a new upper hose and clamps.
Releasing pressure when you lift the radiator cap safety is normal.
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Yeah I changed the thermostat already and it didn't have crud around the thermostat housin and yes the radiator is full to the cap
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id say check where the hose connects to the radiator sounds like thats the best choice with the info you have given
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Yes I'll check on that in the morning and I also wanted to see if ypu know anything about the break system?
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Question......Why would someone Bypass there heater core?????? :-\
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Question......Why would someone Bypass there heater core?????? :-\
leaking heater core or if one of the lines bust you can use the other to connect the intake to radiator to get you by. usually some one is in a pinch when they by pass is and they just never hook it up (mine was by passed for about a year due to it being clogged just didnt want to mess with it when it was 90 degrees out)
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Auh...Good point!! I'm thinking next time I should Think, before I ask!! :P ;D ;)
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lol, its all good. i have my moments too :P