It should be held on with a nut. 1 1/4 deep socket or maybe 1 5/16, something in that range. 6 point preferred.
Loosen the dash and pull out the complete heater box after you have disconnected the heater hose from the firewall...........
Electric mowers do not have pull cords.
Locate the block heater. Drain out the coolant from the rad and from the block if there is a drain there. There should be a screw in the center of the block heater. Unscrew it to loosen the block heater internal clamp. Use a pair of pliers and wiggle it free. As long as it is not plugged in, there should be no worry of damage. It is sealed with an o-ring.The element will have to be worked out as it goes into the block along the side.
Possible air lock in the heating pipes. Common after changing thermostat. look for a bleed screw on the heating pipes between the engine and interior, or loosen one of the heater pipes., after engine has warmed up. Run engine to dislodge trapped air.
No, then remnants will be in your spindle. If they are stubborn, try heating them with a propane torch. Rapid heating/cooling may loosen.
Heating and cooling Vibration
Raise the froth of your car. Drain the radiator. Remove the heater tube from firewall and loosen the hose clamps. Lower the vehicle after draining the antifreeze. Locate the heater core and remove the mounting clamps. Remove the heater core and replace it.
loosen the clamp holding the hose on to a fitting and pull the hose free.
Drain the radiator. Disconnect the heater hose connections at the fire wall. loosen the dash screws and pull it out, just enough to reach the heater core. Unbolt the core and pull it out. Revers the process for installation.
The A/C - Heater blower motor will be located on the passengers side behind the glovebox and you will have to loosen the dash on that side and pry it up very carefully.......
Heating the bottle cap causes it to expand, making it easier to loosen. This is particularly useful if the cap is stuck due to contraction in cold temperatures. The brief heating allows for the cap to slightly expand and become easier to twist open.