Called a Heater Core in North America.
This is a little radiator to make the air in the car warm
The most likely cause is an 'Air Lock' in your heater matrix, probably caused when you changed the thermostat. There are 2 ways of dealing with this; Run the engine, with the heater temperature setting on cold, when your engine reaches normal running temperature, open the heater valve to full. This can work sometimes. For this second method, you need the engine cold: Remove the hose that connects from your cylinder head to your heater and raise it fully. Pour some coolant mixture into the end of the pipe, until it flows from the pipe connection. Reattach the pipe and secure in place. Your heater should now work normally. If it doesn't, you may need to replace the water valve or flush the heater matrix.
The heater coil and a heater core is the same thing. Hot water circulates from the engine and through the heater core then back to engine generating heat for your heater system.
the heater core, heater core hoses or heater control valve is leaking
You will need to remove the water lines from your heater core. Remove the heater core retaining bolts. Reverse the process to install the new heater core.
Remove the water supply lines from your 1990 Ford E3 50 heater core. Remove the heater core retaining bolts. Reverse the process to install your new heater core.
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The heater matrix, in a Peugeot 206, can be replaced by removing the heater core and the hoses. With the heater core removed you can replace it with a new heater core.
The heater matrix can be replaced by removing the heater core and temperature control cables. Replace the heater core and the control cables.
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The heater matrix, also known as a heater core, is usually replaced if found defective. They can be repaired, but is usually cost/performance prohibited.
The heater matrix can be accessed from the front passenger side. Remove the glove box and the flow end return pipes for the heater matrix can be seen. You will need a fairly long T20. Torx driver.
To change the heater matrix on a Skoda Octavia, first, disconnect the battery and drain the cooling system. Remove the dashboard to access the heater unit, which may involve removing various trim panels and components. Disconnect the heater matrix hoses and the electrical connections, then unbolt the heater unit to remove the old matrix. Install the new heater matrix, reassemble the unit and dashboard, and refill the cooling system before reconnecting the battery and testing the heating system.
To change the heater matrix in a Corsa C, start by draining the coolant from the system. Remove the dashboard and the center console to access the heater matrix located behind the dashboard. Disconnect the hoses from the matrix, remove any mounting screws, and take out the old unit. Install the new heater matrix by reversing these steps, ensuring all connections are secure before refilling the coolant.
Bypass the cooling system and discard altogether the heater matrix if you use the car below Rome.