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Yes, replacing the heater core should slove the problem.
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it is located in the fuel tank
For the 1989 Dodge Ram, the heater blower motor resistor can be found on the passenger's side, on the bottom of the heater box. It is beside the blower motor.
replace it
Go to your local dodge dealer and ask if you can get a copy.
The estimated cost to replace a clutch and radiator, in a 1989 Nissan pickup truck is $1100. A private mechanic may be able to do the job for less.
behind glove box near stereo
bad injecter, o-rings are bad, need to either rebuild or replace
Do not believe there were any Dodge Spirits made until 1989! Dodge Spirits was made from 1989-1995, that's when they was replaced by the Plymouth Breeze and the Dodge Stratus.
The 1989 Dodge Dakota automatic shutdown relay switch is located in the fuse box. The fuse box can be found in the engine compartment.
The Dodge pickup trucks with Cummins engines are diesel turbocharger engines. They are built by the Cummins company and have been used in Dodge Ram trucks since 1989.