Most repair shops when they do a complete flush out...they take out the thermostat. No thermostat will never get engine hot.
SOURCE: heater only blows warm air.
The hoses from your heater core should be very hot to the touch. Check the hoses going to the core from the water pump. It should be very hot. The return hose should also be very hot. Now check the hoses going to the core. If they are not the same temp, then your heater control valve is not working correctly or the vacuum is not working. At any rate, locate the vacuum line going to the heater valve. Remove the silver bar on the valve from the plastic plunger arm. You will have heat all the time now if it was only a vacuum problem. You can fix it later when it's warmer out. BTW a 200* thermostat will make your heater even hotter.
SOURCE: Heater not working correctly
you might have a blocked heater core,the core looks like a mini radiater
SOURCE: no heat just warm air
I think you are on top of your problem,,you dont need any one elses advice.
Complete rebuild of the cooling and heating system,, simple.
SOURCE: heater not blowing hot air
sounds like a blend door problem... find lever to blend door disconnect it move lever back and forth and see if it changes anything...
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