BOTH heater core hoses should be hot. If only ONE is hot then the core is probably plugged. If they are both hot then it could be a blend door problem. AeroColorado or someone should be able to help you with that problem. Good luck!
Well, I went to the autoparts store and bought 2 5/8" heater hose repair kits (plastic pipe and 2 clamps) then I went to the Home Improvment store and bought a female hose repair fitting.
I cut the heater hoses, and put the female hose fitting on the heater core outlet hose. I then hooked up the garden hose (through a spray nozzle so I'd have control of the flow). Put a 5 gal bucket under the free end of the heater's input hose and turned on the water.
I got a bucket full of gray glop. The former owner had mentioned having the heads redone, so I think that's the culprit. (Yes he was the sort to simply say oh well and have no heat for 3 years)
I cleaned up, and used the repair kits to reconnect the hoses, fired her up, and voila! Heat!
Just for clarity, the garden hose attaches to the heater hose that leads to the water pump. That way you are reverseing the flow of liquid and pushing whatever is in the way back out the way it came in (and obviosuly could fit through any openings)
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