Heater hose tee from water pump leaking - 2005 GMC Sierra

Cut into the larger of the two heater hoses.

If they're not leaking you don't. If they leak at the plastic tee's, just cut the tee out. Go to the hardware store and buy a barbed tee, 5/8 or 3/4. and three hose clamps to fit. Why spend $50 for the hose, when can repair them for $10.

a great AUX water pump can be added on most vehicles by adding a TEE to the heater hose that feeds your heater core. Although your heater will not be as hot. Assuming that is not an issue.

From the TEE, add a hose to an electric water pump from a HVAC company. There are many and they are designed for hot water and pressure. if it is just pumping you want, then run the output right back to the radiator ( top hose - typically ) and it will be cooled by the radiator.

If you are looking for MORE cooling capacity, then run your AUX water through another radiator or coil of copper someplace convenient, and then back to the radiator. Depending on your needs, make the pump as large as your heat problem demands. remember - if your engine is not running and feeding this type of system, you may starve the AUX pump for water. the engine water pump is priming the AUX pump in this configuration. Good luck , Be cool :)

Either the temperature blending door is stuck, the temperature control cable came loose from an anchor at the endof the cable jacket, or there is an air bubble in the heater core or heater core is clogged. Is the coolant mix adequate for your climate?

with the engine warm and running, are both heater hoses warm? If not, there is no flow. In one extreme case with one of my own vehicles I installed items that are called flushing tees in both hoses to purge the air out. Matk one hose on both side of the cut to distinguish it from the other, and check the ability of the heater core to allow coolant to glow through it. If you are above freezing, water from a garden hose is fine at low pressure. Otherwise you need to use regulated compressed air. If no flow- the problem was a clogged heater core replace core.

If heater core had decent flow thtough it, install one flushing tee per side- ideally in the middle of the hose so each can be held up to collect air from the bubble. With engine cold, start the engine with both tees capped. The one hose that leads off the water pump- crack open first tee until coolant flows. snug cap reasonably tightly. Then crack open the other tee, hold it as high as the hose will allow until coolant begins to flow. then snug cap.

At this point you should have heat if the control cables were all anchored, and doors/actuators opened and closed them correctly.

Yep! Take the heater hoses loose from the engine(one at water pupm\\mp and other one at thermostat housing area usually). Then take your water hose at your house,with a common old pistol grip nozzle,and spray water back thru the heater hose you took off the water pump side and that will force it back thru the heater core and out the hose you took off the thermostat side.
If you want to see the junk that flies out of it,tie a white rag or old tee shirt onto the end of the hose.You'll be amazed what flies out of there.Reconnect your heater hoses and see how it does.
I always fill the hose full of water so when I reconnect them,they don't have any airlock problem. don-ohio (:^)

the top hose

Under hood at the firewall on passenger side bulkhead should observe a set of heater hoses that run off a tee fitting, jump the Tee with a lenghth of same size hose to jump out the rear, if not locate the rear heater core and jump the heater hoses together at the rear by means of an adjustable fitting and two hose clamps.

Too much blockage in heater hoses or heater core.
Bypass valve may be stuck on "bypass" .

1. Remove bypass "Tees", but don't discard.
Replace with straight-through hose fittings.
The core may start leaking under the water pressure since there is no bypass hose.

Once the heater starts working, put Tees back in place. You need bypass protection or the engine will overheat.

Sounds like a clogged heater core, try flushing out the whole system and putting in a flushing Tee on to the heater core hose inside the engine compartment, There will be 2 hoses coming out of the fire wall possibley on the passenger side that go into and come out of the heater core, The Tee can take a garden hose connected to it,[3/4"] hose i think ,measure to be safe all you have to do is cut one of the hoses and install the Tee with 2 clamps and attach a hose, first i would attach 1 side to the Tee and attach the hose but don't attach the other hose just yet ,flush out the heater core first then switch the Tee to the other hose and leave off the other hose so that you flush out the core from the other direction and what ever is clogging up the core doesn't go into the rest of the system.then hook up everything and bring the vevicle up to temp and repeat this process [USE ONLY WATER TO FLUSH OUT ] BE CAREFUL NOT TO BURN YOURSELF WITH THE HOT WATER , PUT A RAG OVER THE TEE WHEN DISCONNECTING THE LAST TURNS ON THE CLAMP.Also change out the thermostat under the hood.

the only thing I can recommend is to put in a flush tee not the hose going to the water pump but the one going to the engine open up the radiator and drain that first then fill with water get some radiator flush and run the car about ten minutes drain that out using the flush tee and a garden hose and run till it is clear with the engine running after clear close drain plug on radiator and fill with antifreeze and make sure to get all air bubbles out and you should start getting some heat and if you don't after doing all this replace the heater core but check the hoses coming from the heater core to make sure one of them is not plugged