1. Is the Problem with Heat Entirely, or Just Low Heat?
* No Heat at All: This suggests a more serious issue.
* Low Heat: This might be a simpler fix.
2. Check the Obvious First:
* Coolant Level: Low coolant means the heater core isn't getting enough fluid to heat. Check the coolant reservoir and radiator. If low, add coolant (the correct type for your engine – consult your owner's manual). Never open a hot radiator!
* Thermostat: A stuck closed thermostat prevents coolant from circulating properly, resulting in little to no heat. A failing thermostat might only partially open. This is a relatively inexpensive part to replace.
* Heater Control: Make sure the heater is turned on, the fan is set to a speed, and the temperature control is set to hot. Check the blend door (see below).
* Fan Motor: If the fan isn't running, check the fuse (consult your owner's manual), and then potentially the fan motor itself. A failing fan motor might make a whining or grinding noise.
3. More Involved Troubleshooting:
* Heater Core: This is a component within the dashboard that warms the air. A clogged heater core restricts flow and reduces heat. Replacing a heater core is a more involved job requiring dashboard disassembly. Symptoms of a bad heater core include:
* Low heat or no heat despite adequate coolant and thermostat function.
* Sweet smell in the cabin (indicating coolant leak).
* Leaking coolant under the dashboard.
* Blend Door: This is a mechanism that directs air flow between the heater core and outside air. If it's broken or stuck, you won't get any heat, even if the heater core is functioning. This often requires dashboard disassembly to access.
* Water Pump: A failing water pump doesn't circulate coolant effectively. Symptoms extend beyond just the heater – the engine might overheat.
* Radiator Fan: Especially in colder weather, a non-functional radiator fan might not be immediately obvious. If your engine runs hot, even with heat on, it might point to a failed radiator fan or coolant fan relay.
4. Repair Steps (General):
These steps are *general* and might vary based on your specific Dakota model. Consult a repair manual specific to your 1987 Dodge Dakota.
* Bleeding the Cooling System: Air trapped in the cooling system can prevent proper heating. Bleeding the system involves opening specific bleed valves (consult your repair manual).
* Replacing Parts: Replacing the thermostat, water pump, heater core, or fan motor requires mechanical skills and specialized tools. Unless you're experienced, it's best to take it to a mechanic.
* Finding Repair Manuals: You can find repair manuals online (eBay, Amazon) or at auto parts stores. These manuals provide detailed diagrams and instructions for your specific model.
5. When to Seek Professional Help:
If you're uncomfortable working on your vehicle's cooling system, it's best to consult a qualified mechanic. Working with coolant can be hazardous, and improper repairs can lead to further damage.
This information is for guidance only. Always consult your owner's manual and/or a repair manual specific to your 1987 Dodge Dakota for detailed instructions and safety precautions. Working on your vehicle's cooling system involves potential hazards, so be cautious and consider seeking professional help if needed.
