Can someone tell me which hose goes where on the heater core. I have one hose coming from the water pump and one coming from the thermistat housing area or intake manifold. I was just wondering which hose goes on the top tube and which one goes on the bottom tube. Thank you. The car is a 2000 dodge durango 2wd with 5.2L
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It usually doesn't matter-it just circulates coolant through the core and returns it. But the hose going to the water pump is the return hose from the core. The other hose from the cylinder head or intake manifold is where the coolant comes from and going to the heater core. Take off the hose at the water pump and you will see a stream coming out with the engine running and the heater control on hot. Try this and if the stream is not good, try swapping the hoses at the core- I mean take the hose to water pump and fit it to the core's upper hose, and the inlet hose to the lower fitting. It shouldn't matter, but let us know.
I don't know if top or bottom, but the heater core inlet will be the hose coming from either the intake manifold or a fitting on a cylinder head. The outlet from the heater core goes to the front of the engine, it goes into the water pump. I think all GM engines are like this, and almost all engine designs likewise. On a 1992 3.8L, for example, the heater core inlet hose comes from the intake manifold on the passenger side. The heater core outlet goes into a fitting on the water pump (lower front of engine).
That sounds like a plugged heater core or heater hoses. At lower RPM there is not as much pressure from the water pump, so the coolant can't circulate through the heater core. Find the heater hoses (in and out) on the firewall. With the car running, engine warm to hot, squeeze the hoses - they should be hot and pretty tight. If they aren't, then something's probably blocking them. Then you'd just have to figure out if if it's the heater core that's blocked or the hoses. You can disconnect the hoses and blow compressed air in to the heater core. Probably a lot of crud buildup. It's messy but it can be done.
Greetings, Just remove the heater hoses where they go in to the firewall, and connect them together with a short piece of copper pipe and a couple heater hose clamps. Or, remove the hose that goes from the water pump to the firewall completely, then remove the firewall end of the other hose and connect it directly to the water pump. If the relative sizes of the two heater hoses make this impossible, then revert back to my first suggestion. For a video showing the basics of replacing heater cores go here. Thank you for using FixYa.
Is it the smaller water hose from the heater core? Coming from the firewall behind the engine? The metal fitting on the water pump will have to be replaced. Some are threaded and screw in. Others are press fitted, If a shop can get to the fitting where it is, they might fix it easily. Otherwise, you may need to have the pump removed, and a new fitting installed, or hey, a good time to replace the pump.
Water pumps usually have a weep hole on the bottom of the snout. This is put there so when the seals go bad you will know from the water leaking out. Try to look for that weep hole and see if coolant is coming from there before spending money on a pump. If the pump does not look as if it has been leaking then maybe its just the hose.
Not knowing what Pontiac car (or Truck) you are working on and what hose specificly. When asking for the hose at the store just tell them where it goes to. Water pump bypass, water pump to intake, water pump to heater core, etc..
LOOKING AT HEATER CORE TOP HOSE COOLANT FLOW IN BACK OUT THROUGH THE BOTTOM HEATER CORE HOSE CHECK WATER PUMP BYPASS HOSE SEE IF IT GETS HOT.IF NOT COULD BE BLOCKAGE AT BYPASS HOSE FROM WATER PUMP OR WATER COULD BE FAULTY GETTING TOO WEAK PUMP COOLANT THROUGH SYSTEM.IF COOLANT GETTING HOT GOING TO HEATER CORE THE HEATER CORE AND COOLANT SYSTEM NEED FLUSHING OUT.
remove one hose (which ever is easier to get off) from the heater core and start the engine if the hose a water coming out then it is the wrong hose if water comes from the heater core then you have the correct hose. I know this sounds tedious but it is the sure way to tell. Do not use plyers to remove the hose, this will bend the end of the pipe and make the hose leak. You are better off to remove the clamp and cut a short slice, the length of the heaer core pipe, and then shorten the hose to put it back on.