XCMG Loader VDO Coolant Temp Sensor – PN 803545325 / 323801001007 (Z3/8 NPTF) | OEM Siemens-VDO 120°C Sender

The XCMG PN 803545325​ corresponds to 323801001007 (Z3/8), a genuine German VDO (now under Siemens) coolant temperature sender​ —  XCMG loader spare. The Z3/8​ in the model denotes a 3/8-18 NPTF tapered pipe thread​ — a US-standard fine-pitch taper thread that seals on its own metal-to-metal contact, so never wrap Teflon tape or apply thread sealant​ during installation, or you'll break the ground path and cause false gauge readings. Body specs (VDO official): measuring range +40 °C to +120 °C, operating temp -40 °C to +150 °C, resistance output 287.4 Ω (cold) → 22.7 Ω (hot), operating voltage 6–24 V DC, connector AMP male blade 6.3 × 0.8 mm, single-pole common ground, no warning contact, overall length 29 mm, diameter 9 mm, tightening torque 30 N·m. It works on a built-in NTC thermistor​ — higher temperature = lower resistance; the changing resistance travels down the harness to drive the gauge needle and/or feed the ECU for fuel / ignition-timing / fan-control logic. It normally mounts on a coolant passage near the cylinder head or water pump​ — trace the coolant return hose to find it: a metal cylinder with 2-3 wires attached.