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All our trucks are a minimum of 21 yrs old and heater hoses are bound to fail if for no other reason than dry rot. Pre-made heater hoses are no longer available. Not too hard to replicate BUT the trick to heater hose replacement is the snap-on connectors at the firewall (heater core). I didn't know whether I would need the straight-on or 90 degree connectors so I bought both. I will post later which one I used. O'Reilly's stocks the straight-on (Part #Dorman 47165) but NOT the 90 deg (Part Dorman 800-416) which I got at NAPA. Whichever you use, you will need 2. Price about $15 ea X 2. Might check other outlets, Auto Zone, Advance, etc.
Correction!! One of the outlets is 5/8" and the other is 3/4". Local NAPA and O'Reilly's had the 5/8" in stock but had to order next day on the 3/4". My truck had a plastic T in the short hose from Motor, to Overflow, to heater core. We also replaced it with a brass fitting. We replaced every rubber hose under the hood, heater, radiator, overflows, any we could find. Also replaced both belts and thermostat. Also replaced the oil pressure sending unit as the one on it cycled to 80, back to 0, and back to 80. It now works properly. I know it was a gamble whether it was sending unit or stepper motor but you have to get a little good luck every now and then.
Correction!! One of the outlets is 5/8" and the other is 3/4". Local NAPA and O'Reilly's had the 5/8" in stock but had to order next day on the 3/4". My truck had a plastic T in the short hose from Motor, to Overflow, to heater core. We also replaced it with a brass fitting. We replaced every rubber hose under the hood, heater, radiator, overflows, any we could find. Also replaced both belts and thermostat. Also replaced the oil pressure sending unit as the one on it cycled to 80, back to 0, and back to 80. It now works properly. I know it was a gamble whether it was sending unit or stepper motor but you have to get a little good luck every now and then.