5 1/4 per crutchfield.com =============================== My Diamante had factory 6.5"
The transmission relay switch on a 2003 Mitsubishi Diamante is typically located in the engine compartment fuse box. You can identify it by checking the diagram on the fuse box cover, which will indicate the specific relay for the transmission. If you're having trouble locating it, consulting the vehicle’s service manual can provide detailed information and diagrams.
3 bolts 2 wires
about $700 to $800...with a new water pump
The 4x4 system on a 2003 is not vacuum controlled.
the oil filter is next to the oil pan underneath the car( passenger-side)
2003 honda rancher vaccume diagram
You can find a free 2003 Chevrolet Express Van V-6 vacuum diagram at most Chevrolet dealerships. You can also find the diagram at most libraries.
don gory. me help yu
http://www.installdr.com/Harnesses/Mitsubishi-Wiring.pdf
The OBD-II plug for a 2003 Mitsubishi Diamante is typically located under the dashboard on the driver's side. You can find it near the steering column, often just above the brake pedal. It may be necessary to remove a cover panel to access the connector.
On a 2003 Mitsubishi Diamante, the diagnostic connector is typically located under the driver's side dashboard, near the steering column. Terminals 1 and 4 on the OBD-II connector correspond to the positive and negative battery voltage, respectively. Always ensure the ignition is in the "ON" position when accessing these terminals for accurate readings.