First you need to run the engine until the thermostat opens, you will see the water
running through the radiator. the coolant will go down into the radiator You need to continue to add coolant until you don't see anymore air coming up, or coolant go down into the radiator maybe three times that the thermostat opens. When you have got most of the air out you will see the water running inside of the radiator then stop when the thermostat closes. Cycle it two or three times to be sure.
more than likely an air lock on your water system it will need bleeding to release the air lock if that fails try replacing the thermostat
You may have an air lock in the heater pipes some vehicles are fitted with bleed screws for this purpose.
Try replacing your thermostat.
more likely to need a new thermostat in engine , than an air lock.
Check your coolant levels, and check your thermostat - it may need replacing. Also check your heater hoses to ensure they're not leaking.
Air bubbles still trapped in the system
check the thermostat dude may need replacing
Common causes of furnace ignition failure include a malfunctioning thermostat, a dirty or faulty ignitor, a clogged air filter, or a lack of fuel supply. To resolve this issue, you can try resetting the thermostat, cleaning or replacing the ignitor, replacing the air filter, or checking the fuel supply to ensure it is sufficient. If these steps do not work, it is recommended to contact a professional HVAC technician for further assistance.
To stop a thermostat from sticking on a window air conditioner, first, ensure that the thermostat is clean and free of dust or debris, as buildup can interfere with its operation. You can gently clean the thermostat with a soft brush or cloth. Additionally, check for any mechanical issues, such as a misaligned or damaged thermostat, and adjust or replace it if necessary. Finally, ensure the air conditioner is level, as improper installation can affect thermostat function.
To ensure your thermostat automatically switches from air conditioning to heating based on temperature settings, you need to set both the cooling and heating thresholds on your thermostat. When the temperature falls below the heating threshold, the thermostat will switch to heating mode, and when it rises above the cooling threshold, it will switch to air conditioning mode. Make sure to program these thresholds correctly to ensure the thermostat functions as desired.
try replacing the thermostat
Not sure what you mean by rodding the rad., but, if it were cleaned by a rad. shop and given the ok, then, has the water pump been changed, is there a blockage in the system, is there an air lock in the system? To release an air lock, bleed the system by the heater hose with the engine at operating temp. Does it over heat at idle, hiway speed, with the a/c on or off ?