Generally no. The amount of heat is small, but you should hear a buzzing noise when the heater is running. Mark
There is no such engine as a Cummins 2500 Diesel.
It is normal operation. With "key on engine off" the check engine light should be illuminated so you can observe that it is properly functioning.
The fan clutch is not functioning properly. Replace.
How cold is it. Most diesel engine do not responed properly when the engine and fuel is cold.
Depends on WHICH Cummins engine.
No Cummins INC company makes the Cummins engine.
Clessie Cummins
no, ford did not invent cummins engine, clesie cummins does invented it
Oil pump not functioning properly.
If the alternator is functioning properly you should read somewhere around 13.5 to 15.5 volts DC at the battery with the engine running at idle.
Turning the fuel screw on a Cummins will determine the fuel flow tot he engine. If the screw is set too high of low then the engine will not run properly and could cause engine damage.
Ralph Cummins