The hose, coming off the engine block and running into the heater core, has a fitting that screws into the engine block that broke at at the threads.
it looks like it is an aluminum fitting, which, i thought was a heater hose fitting, is not the same thing.
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These cars are notorious for having blocked heater cores, causing the heater to blow cold air. That's because there is a heater core bypass hose near the firewall that allows the coolant to bypass the heater core. Eventually the heater core fills with gunk and no coolant passes through it. You'll need to disconnect the hoses from the heater core at the firewall and flush the core using a garden hose. Flush both ways till water runs clear. If you can't access the heater core fittings at the firewall, then follow the hoses from these fittings back to the engine and disconnect them at that point and flush from there. If you flush from the hoses in this manner, it is important that you clamp off the bypass hose at the firewall with a vice grip pliers.
Otherwise the flushing water will go through the bypass hose and not the heater core.
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.
The core may be plugged, or it may have an air lock, or the core may be fine and the doors in the heater case may not be opening properly to pass heat.
With the engine at normal operating temperature, feel both the inlet and outlet core hoses at the firewall. If the coolant is circulating both hoses should be hot. If only one is hot, try cracking open the outlet line, with engine running, to get flow started from an air block. (The outlet line will run from the firewall to the front of engine near or at the water pump housing. The inlet for the heater comes off the top of engine from a head fitting and goes to the firewall.) If no flow results, the core may be plugged. To flush the core, take both hoses off at the firewall or off at where they fit on the engine, and put a garden hose into the outlet-flush it backwards-run until clear-let the water run to ground or use a catch can if able to. Some people use compressed air into the core instead of water flushing. Either way, you should see some sediment come out if it had any blockage. Once you get the heater core circulating, any further heater problems need to be addressed at the heater case. Make sure the temperature blend door can open and close-this door opens to let blower fan air pass across the heater core. Good luck.
drain coolant system locate heater cores hoses going through firewall you need to buy the radiator flush kit at any auto parts stores. remove heater cores hoses from one end or buy extra long heater hoses same size as heater core hoses in vechicle at auto parts store use the flush kit when you flush through one of the heater core hoses let the other hose drain in a drain pan when you use home garden hose use low water pressure dont use garden hose to the max or you will rupture heater core. your best bet let radiator shop flush whole coolant system. because heater cores hoses are in a tight spot.make sure engine off if you just going to flush out heater core only .after flushing heater core good time to replace heater core hoses.if job too hard or complicated let radiator shop flush out radiator the engine block and heater core because if radiator stopped up or engine block stopped up the gunk and rust will reenter plug up heater core.if you tight on money you can flush out your own radiator.drain out radiator using large drain pan. remove top radiator hose and remove bottom radiator hoses connect to water pump.use garden hose with flush kit part with water pressure not too high put garden hose to top radiator hose run water until clear water run out bottom radiator hose in drain pan,the flush out engine block remove thermostat.if you had another spare thermostat housing with RTV SILICONE SEALANT THAT HAS SET UP INSTALL THERMOSTAT HOUSING BACK TO ENGINE WITHOUT THERMOSTAT FLUSH OUT THE ENGINE BLOCK, WHEN DONE INSTALL NEW THERMOSTAT THEN INSTALL ORIGINAL THERMOSTAT HOUSING WITH NEW ORING WHICH YOU BUY AT DEALERSHIP.IF ALL SOUND COMPLICATED LET RADIATOR SHOP FLUSH OUT COOLANT SYSTEM.
Check to see if the heater core hoses going into the firewall are hot when the engine radiator hoses are hot. If one heater core hose is hot and other is cool, then the heater core is blocked/plugged. If they are both cold then the hoses are blocked. Trace them both back to the engine and make sure there is no on/off valve on the intake to turn on. Some of those valves are vacuum operated or electrical. Just depends. For a quick fix. You can remove that valve and install a screw in fitting to the intake manifold that has a barb on the end to slip a hose over. But the heat will always be on hot.
If the hose comes from the engine and goes to the firewall it is most likely a heater core hose. If it's a rubber hose with clamps on each end it should be fairly easy to replace by lossening the clamps and fitting a correct size new hose in it's place.
The problem is the heater core leaking behind the dashboard.
Heater CoreRemoval & Installation1997-2002To Remove: NOTE: Heater core must be vacuum leak tested before it is remove from vehicle if a heater core leak is suspected.
Drain engine coolant.
Remove instrument panel.
For 5.4L (4V), if quipped, remove junction splash shield.
For 5.4L (4V), if quipped, disconnect starter relay cable.
For 5.4L (4V), if quipped, remove junction block bracket.
Clamp inlet and outlet heater hoses.
Disconnect heater hose from heater core by gently pressing it toward heater core.
Remove A/C plenum demister adapter.
Disconnect vacuum line.
Remove 13 plenum chamber top screws.
Remove blend door assembly from case.
Remove heater core.
To Install: NOTE: If needed, clean and lubricate coolant hoses with plain water.
Install heater core.
Install blend door assembly to case.
Install 13 plenum chamber top screws.
Connect vacuum line.
Install A/C plenum demister adapter.
Connect heater hose to heater core.
Release all clamps from inlet and outlet heater hoses.
For 5.4L (4V), if quipped, install junction block bracket.
For 5.4L (4V), if quipped, connect starter relay cable.
For 5.4L (4V), if quipped, install junction splash shield.
Park the vehicle on a level surface. If the engine has been running allow it to cool completely.
Drain the cooling system. Remove the radiator cap from the radiator.
Locate the petcock valve on the lower corner of the radiator. Place a
waste oil collection pan underneath the petcock valve and turn it
counterclockwise to open. Allow the cooling system to drain completely.
Label and remove the heater hoses from the heater core. The heater
hoses will connect to the heater core in the engine bay, on the
firewall, on the passenger side of the vehicle. Use either the Phillips
or the flat-blade screwdriver to loosen the hose clamps that secure the
hoses to the heater core. Then pull the hoses off the heater core.
Removing the Heater Core
Remove the heater core cover. Move to inside the passenger compartment.
Locate the heater case. It will be bolted to the firewall, below the
dash on the passenger side of the vehicle. Use an appropriate sized
socket or wrench to remove the five screws that connect the heater core
cover to the heater case, and remove the cover.
Remove the steel straps that secure the heater core to the heater case.
Unscrew the four screws that connect the steel straps to the heater
case using a socket or wrench and remove the straps.
Remove the heater core by pulling it out of the heater case.
Installing the Heater Core
Place the new heater core into position inside the heater case. Be sure
to carefully guide the inlet and outlet tubes through the holes in the
Reinstall the heater core retaining straps, by reinstalling the four screws that secure them.
Place the heater core cover into position over the heater case and reinstall the five screws that secure it.
Refilling the Cooling System
Reconnect the heater hoses to the heater core. Slide the hoses onto the
inlet and outlet fittings that extend through the firewall, and tighten
the hose clamps.
Close the petcock valve on the lower corner of the radiator by turning it clockwise.
Refill the radiator with a 50/50 mix of antifreeze and water.