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its working
Check to make sure the intake heater is working.
replace the blower motor resistor. it is located on the firewall near the heater hoses.
most likely the electricity going to them
american water heater company
A very basic answer is: The hot water the engine produces is circulated thru the heater core. The heater core looks like the autos radiator only smaller. The heater core is located inside the heater box. So as the engines hot water circulates thru the heater core the heat will transfer into the heater box. As long as the engine is running and everything is working properly the heater core will stay hot inside the heater box.
probably heater core btw 8hrs have to remove whole dash
The clutch is working fine. The problem could be as simple as a loose belt.
A machicne that makes the air wamer
Probably the heater blower motor.
The DeLonghi DFH255OTB Safe Heat Fan Heater is a safe option
Rheem