Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Dual Electronic Automatic Temperature Control
With the use of a micro-controller, the dual automatic temperature control (DATC) module analyzes input from the following major sources:
- Temperature, function and blower selection (made by the vehicle occupants)
- In-vehicle temperature sensor
- Ambient temperature sensor
- Dual sunload sensor
- Vehicle speed
- Engine RPM
- Engine coolant temperature
- Actuator door position controls
- Driver and passenger heater core air discharge temperature sensors
- Evaporator discharge temperature
Using these inputs, the micro-controller determines the correct conditions for the following outputs:
- A/C clutch engagement
- Blower speed
- Cold air bypass door position
- Panel door position
- Defrost door position
- Floor door position
- Air inlet duct door position
- Driver coolant control valve
- Passenger driver coolant control valve
- Electric water pump (3.9L engine)
- Heater wiper rest or heated windshield
- Heated rear window rear defog
- External temperature (outside temperature display)
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.