I have checked all electronics they are good.
I have also checked the heater core and flushed it and it is good.
When the truck is at normal oporating tempature and i am driving i get a small amount of heat, when I come to a stop it goes away.
If I stop and put it into neutral then hit the throtle I then gain some heat back.
I have a 99 Dodge Ram sport 5.9 letre
I suspect it could be something in the water pump
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Start with Flushing out your cooling system. Flush it out with Preston Radiator flush, you have your preference of ether the super flush which takes 3-6 hours or the 10 min flush which is good if you don't have the time to flush out your cooling system.
After you have flushed out your cooling system, replace your thermostat and you should be good for another cold winter driving. What happens is that after a few years of the coolant not being serviced, the coolant crystallizes and clogs up the heater core and radiator causing poor circulation. Poor circulation will cause poor heat and or overheating issues to the engine.
Before you go through all that inspect to make sure you have the right amount of coolant in your cooling system.
If the coolant is full and the thermostat is bringing the temperature of the engine up to par than I would bet with 95% certainty that the heater core is plugged.
You can try back flushing it. You'll need a pair of pliers, a drain bucket, a piece of heater hose the same diameter as the heater hoses (about 3/4"), and a couple of needle nose vice grips. Pinch off both of the heater hoses at least 6 inches or more from where the attach to the heater core with the needle nose vice grips. This will minimize coolant loss from the engine. Put a drain bucket under the car to catch any coolant that runs out (by the way this is going to make a huge mess). Remove the clamps and heater hoses from the heater core. install the short piece of 3/4 inch heater hose onto a garden hose. Install the other end on one of the heater core tubes. Using low water pressure flush the heater core. You should see a lot of nasty stuff come out. Repeat on the other heater core tube. Continue this process until the water runs clear.
Reinstall the heater hoses, remove needle nose vice grips, Top off the coolant in the radiator, start the vehicle and let idle. Continue to monitor the coolant level and add as necessary. You should start to get some heat with the blower setting at low. If the heat goes away at higher settings than you'll need to repeat the procedure described above. Sometimes driving for a couple of days will help loosen up the debris in the heater core.
Also if the coolant is really dirty that it will help too have the cooling system flushed as well to prevent the debris in the coolant from settling in the heater core after you have flushed the heater core.
There is always the possibility of the heater core leaking after an attempt to flush is made. Using low water pressure will help minimize this.
Sounds like the problem has to be the valve is not opening and thus not allowing the hot coolant to enter the heater coil. Manualy open the valve (engine firewall) and see if heat is present. If this works check your cable from the dash switch as it isn't working the valve properly and needs replacing.