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Are the controls for opening the heat functioning? Opening the heater core and allowing fluid to pass through the core would be where I would look. For instance you could remove the outlet hose from the core and see if water is passing through. Thinking it might be a clogged heater core. How about the heat gauge on the dash? You said the hoses were hot so guess the engine is reaching proper temperature. If you have A/C can you get warm air when you use defrost? If so, the heater core is OK. Conclusion: My first thought is the heater controls are not working properly but if they are then my second thought is the core itself. Hope this helps you.
Possibly plugged or inerporable heater core. Possibly heater core valve (this diverts hot air through your heater system) When you flushed the block, was there a lot of contaminant? 95% of the time, cold heat means thermostat. Also there are a lot of really cheap after market thermostats, you can buy one as low as $6.00. That being said, just because a thermo is new doesn't necessarily mean it opens/shuts when it should. You can look on You Tube on how to test one in your kitchen with boiling water,.
So three basic things affect interior heat temps. Thermostat, plugged heater core/.valve, and insufficient coolant or liquid to tranfser heat. If your interior coolant (engine temp) is working normally and your vehicle reaches operating tempature according to the needle, your thermosat is probably not the cause.
My bet is somehow, your heater core is plugged so that their is not enough "flow"
check the coolant level in the rad,then check both heater hoses when the truck is warmed up they should be the same temperature if not then the heater core is plugged.you can try running/soaking the heater core with CLR to try to unplug it.if it doesn`t work then it will have to be replaced.also the thermostat may need replacing.
check for poor flow to heater core-change heater hoses -check for lime build up at intake connector or worn out water pump -if you only put water through core try using CLRlime cleaner in core-get two 6in pieces or heater hose hook them to core and pour it in and leave for 15 mins then wash out with water hose
No, you just won't have water flow through the heater core, Coolant flows through the engine through the lower radiator hose as the water pump sucks it out of the radiator and pushes it through the engine. It then flows out the top radiator hose when the thermostat opens. It then flows into the radiator to cool off.
if engine temp. is good. i would rec. good flush of the heater core disconnect both heater hoses and flush core in both directions. (pressure washer works good)
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