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Is the thermostat opening at 195 degrees ? Does the radiator fan come on at 220 degrees ? Can you tell if the water pump is moving coolant thru the system after the thermostat opens ? Are both radiator hoses hot ?
Check vacuum hoses. There's one between engine and firewall at the passanger side that operates ur heater. This little creature dries up due heat expossure and cracks causing a vacuum leak that will trigger ur check engine light as well..
try feeling your heater hoses going from the engine to the heater core. they should be hot at operating temperature. If one is hotter than the other noticably it would indicate a restriction in the core most likely. A partially stuck thermostat could also cause loss of heat but you say the temp is normal. Start with checking hose temperature if they are both on the cool side compared to the radiator hose then further diagnostics are necessary. hope this helps. Keep in touch.
Must be cold out! if you never get any heat on gauge check engine open hood and see how hot engine is getting you will know if engine is at operating temp (170-195 degrees). if yes is there a thermostat? if there is one it could be stuck open even then you should still have at least a little heat. change thermostat last resort a little cardboard in front of radiator will get you by in a fix. Exercise caution with cardboard watch gauge don't want to over heat engine...
Aside from flushing the radiator and heater core andreplacing your hoses, did you happen to replace your thermostat. Sounds to me like that's your problem if everything else seems to be in order. If you change the thermostat and still have no heat, you might check your vacuum lines running to the back of your heater controls inside your dash. That's really the only other thing that I believe could be causing your lack of heat.
Hope this helps! Have a great day and try to stay warm!