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Originally Posted by bsilverado00
This issue started a few weeks ago, let the truck sit for a couple of days and no heat, did a radiator flush, replaced the thermostat/water outlet. Hose into heater core hot, return hose cold. Is there anything else in that cooling loop that could cause the problem, or is the core plugged? It's an ext cab 5.3. All help appreciated.
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the heater core appears to be blocked.
i have 2000 5.3 dexcool coolant . when i replace coolant i have found debris only in the heater core. coolant is very clean after 5years which is my r/r cycle. so if you disconnect heater core hoses at engine thermostat and force water into heater core and reverse this should show if this was the problem. also when filling coolant keep fill cap off. run engine to operating temp could be air in system....