Therefore, you might not find one at all. If a previous owner added one, it could be located in a variety of non-standard places, potentially behind the glove box or somewhere along the HVAC system's air intake.
To confirm if your specific Dakota has one, and its location, you'd need to:
* Check your owner's manual: This is the best first step.
* Consult a repair manual for your year and model: A Haynes or Chilton manual will usually show the location if one was installed from the factory or is a common aftermarket addition.
* Visually inspect areas near the HVAC system: Look behind the glovebox and along the firewall. This is a potentially messy and time-consuming task.
In short, don't be surprised if you don't find one. It's entirely possible your truck never had one.