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If your heater core is installed corectly, it will have the 5/8 line at the bottom and the 3/4 at the top. The 5/8" line will come from your intake manifold. The 3/4" line will go to either your radiator or to a nipple on the water pump.
I had this problem on a winter beater of mine. I never did figure out what it was. I would freeze the moment the truck came to a stop at idle. I would slip it into neutral and run the rpm's up to 2000 and I would get heat.
My best guess was a bad impeller in the water pump. It wasn't making enough flow to push the water to the heater core. I haven't had to fix the problem because I parked the truck. It developed what I think is a bad head gasket, which may or may not be connected to the heat problem. If you figure it out please report back!
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1971 C-10 Suburban (Ochre)
1971 K-10 Suburban (Ochre)
1972 C-10 Suburban (Ochre)
1972 K-20 Suburban (Yellow- that just aint right!)
Springfield, Minnesota 56087
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