1993 Dodge Dakota Heater doesnt work

[quote:8e92d48c3f="Bher2662"]Heater problem
1993 Dodge Dakota V8 Two Wheel Drive Automatic 96,500 miles
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i read a response about heaters not working, but mine will go on and off frequently. For example: I start my truck in the morning to warm the engine up. i enter the truck about 25 min. later and the guage showes the engine is warm, but the air is ice cold. When the truck starts moving, it quickly becomes very warm. Then after maybe a minute or two, it becomes icy cold again. Then, naturally, i shut off the vents. After a minute (while the a/c is still off) i feel a very small amount of warm air coming through, so i turn on the vents again to get all the warm air and it turns icy cold again. any idea as to what it could be specifically? the radiator is less than a year old ( the old one had major cracks, so i bought a brand new one)[/quote:8e92d48c3f]
i will try to flush the heater core as a first step
Engine cool
lower the coolant level
Locate the two hoses running to the heater core
disconnect them at the engine side leaving hoses connected to heater core throw the firewall
use garden water hose and compressed air if possible
run the water and follow by air throw one side and out the other and vice versa
do that two to three times watching what leaving the heater core you are looking for the go flow and clear water to run throw
also check water pump!
good luck
let me know