The intake heater is the square block between the air horn and the intake manifold.
The front suspension will not hold the weight of the Cummins.
Flush,Clean or change the heater core u need to replace engine thermostat
I assume you are referring to between the engine and the firewall. There are 2 heater hoses in that location.
the heater core or heater core hose is leaking engine coolant
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Pictures of the thermostat housing location, on a 1998 Cummins diesel engine, can be found at most, heavy duty truck dealerships. The pictures can also be found at many auto-parts stores.
The fan control module in the engine compartment has gone bad.
2. one pre cat and one post cat
check heater motor