perhaps the valve that opens and closes the passage for the antifreeze to go in to the core is stuck and not opening all the way preventing free flow of antifreeze thru the heater core.
The first possibility is the thermostat didn't work. To find this out, after the engine is warmed up u check the hoses going from the engine to the heater, they should be hot. if they are hot then the next reason would be a cable to the temp on the heater needs to be adjusted or the heater core is plugged inside or out.
To change the thermostat on your water heater, first turn off the power to the heater. Remove the access panel to locate the thermostat. Use a screwdriver to adjust the temperature setting to your desired level. Replace the access panel and restore power to the heater.
To replace the thermostat on a 1999 Chevrolet Lumina, first, ensure the engine is cool and disconnect the battery. Drain the coolant from the radiator, then remove the upper radiator hose connected to the thermostat housing. Unbolt the thermostat housing to access the thermostat, replace it with a new one, and reassemble by reversing the steps. Finally, refill the coolant and check for leaks.
To replace the thermostat on a water heater, first turn off the power and water supply to the heater. Remove the access panel and insulation to access the thermostat. Disconnect the wires and remove the old thermostat. Install the new thermostat, reconnect the wires, and put everything back together. Turn the power and water supply back on and test the water heater.
The best way to troubleshoot a malfunctioning thermostat for a baseboard heater is to first check the power supply, then inspect the thermostat settings and connections, and finally consider replacing the thermostat if necessary.
To test a hot water heater thermostat, you can use a multimeter to check for continuity in the thermostat. First, turn off the power to the water heater. Then, remove the access panel to expose the thermostat. Use the multimeter to test the thermostat's terminals for continuity. If there is no continuity, the thermostat may be faulty and needs to be replaced.
To replace the thermostat on an electric water heater, first turn off the power to the heater at the circuit breaker. Then, remove the access panel and insulation to expose the thermostat. Disconnect the wires from the old thermostat and remove it. Install the new thermostat and reconnect the wires. Replace the insulation and access panel, then turn the power back on and test the water heater.
First check the water level. Low level will not get to the heater core. Change the thermostat. If you recently changed the thermostat, bleed the coolant system.
To replace a water heater thermostat, first turn off the power and water supply to the heater. Remove the access panel and insulation to access the thermostat. Disconnect the wires from the old thermostat and remove it. Install the new thermostat and reconnect the wires. Replace the insulation and access panel, then restore power and water supply.
To test the thermostat on an electric water heater, you can use a multimeter to check for continuity and proper functioning. First, turn off the power to the water heater. Then, remove the access panel to expose the thermostat. Use the multimeter to test the thermostat's terminals for continuity. If there is no continuity, the thermostat may be faulty and need to be replaced.
First place to look is the thermostat
To replace a baseboard heater thermostat, first turn off the power to the heater at the circuit breaker. Remove the cover of the existing thermostat and disconnect the wires. Install the new thermostat by connecting the wires according to the manufacturer's instructions. Secure the new thermostat in place and replace the cover. Finally, turn the power back on and test the thermostat to ensure it is working properly.