Where is the AC Heater relay switch on a 2002 Dodge Stratus?

The AC heater relay switch isn't a single, easily identifiable switch like a light switch in a 2002 Dodge Stratus (or most modern cars). The system's operation is controlled by a complex interplay of several relays, the HVAC control module (often called the blower motor resistor), and the various circuits within the system itself. There isn't one single "AC Heater Relay".

To diagnose problems with your AC or heater, you'll need to consult a wiring diagram specific to your 2002 Dodge Stratus. These diagrams will show you the location of the various relays (there will likely be several related to the climate control system) and fuses involved. You can find these diagrams in a repair manual for your vehicle, often available online (e.g., through a subscription service like AllDataDIY or Mitchell 1) or at auto parts stores.

Instead of looking for a single "AC heater relay," focus on:

* The HVAC blower motor resistor: This is a common point of failure, causing inconsistent or no blower fan operation. Its location varies by model, so check your repair manual.

* Relays in the underhood fuse box and interior fuse panels: Examine the diagrams to identify relays associated with the A/C compressor, blower motor, and heater. Look for burned or damaged relays.

* Fuses: Check fuses related to the climate control system in both fuse boxes.

Without a wiring diagram and a multimeter to test circuits, pinpointing the exact problem is difficult. It's best to consult a repair manual or take your vehicle to a qualified mechanic for diagnosis and repair.