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Re: AC vacuum pod and question
One thing to check is make sure one of the heater hoses is connected to the intake manifold outlet and the other to either the water pump or radiator. If a PO connected from the water pump to the radiator, you will get very little flow as neither is a pressurized output. This assumes a standard SBC or BBC. LS motors may be different.
When you install your replacement heater core, be sure to seal all gaps. Most replacements are not a perfect fit compared to the OEM core. What looks like a small edge gap can leak a lot of air that won't be picking up heat from the new core.
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