Is there air in the system?
when I run the truck for a bit and shut it off, the top hose collapses.
There is water in the radiator.
Water comes out of a capped T that is in the heater hose if I unscrew it, whether engine is running or not.
Any ideas on whats going on here?
What is the overall condition of the hose like? Is this a new bargain basement hose that doesn't have the big spring in it? Alternatively, if the hose is as old as the truck that could be the issue right there. The other possibility could be a failing water pump. If this is a new water pump is it rotating in the correct direction?
Perhaps a little mopre information about the overall condition of the heating/cooling system might help a bit.
NEw water pump 4 months old.
New Hose, New radiator 2 days ago. Temp guage runs between o and r of Normal.
No Spring in Hose. New Thermostat. Water Pump runs in the same direction it always has. All I can think of.
What would indicate a failing water pump? There is no water coming out the weep hole. and its not squealing or making bad bearing sounds. With the radiator cap off the water moves so I guess its working.
get a spring and put it in the hose
this is a common problem and can cause your engine to overheat
the pump causes a suction when the thermostat is closed
this causes the hose to collapse
you need a spring to stop it
After it cools off and the hose is collapsed, remove the cap and if you get a suction effect like their is a vacuum in there then the problem is the cap. Those springs are meant for the lower radiator hoses because the pump can collapse them from the amount of volume they try to bring into the engine.(assuming traditional coolant flow engines)
I had this problem once...I tried everything....hose, water pump even a new radiator. Called my dad and he started laughing. He said he had a tool that would help me figure out what the hell the problem was and he was coming over for dinner.
He went under my hood and took the cap off and put a new one he got on his way over. I started up my truck and turned it back off again and....PRESTO. It was all good. I stil haven't been able to live that one down. Still brings it up and that was 7 years ago.
Look at it this way. It is like a 5 dollar part...try it and see what happens. Couldn''t hurt.