Air con pump does not come on when switched on . landrover series 2 td5 .no power to energise relay to for pump, if i bridge out the relay the pump will run, is there a pressure sensor for gas pressure in the circuit.
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look for power at the fuel pump connector at the fuel pump in the fuel tank (the wire that should have power when the engine is running or cranking over is White and Purple (maybe White and Pink, I can't remember). These cars also have a fuel pump inertia switch (a crash protection device, if it fails the fuel pump looses power), located passenger side rear of the engine compartment, same type used on Jaguars seen the fail, just press the button on top of the inertia switch to reset it or temporarily bridge the two wires and see if the engine now starts. Fuel pump relay is behind the right front kick panel at passenger right foot well.
You need a blower motor resistor pack, follow the wire from the motor it will go into a connector with a few wires at the resistor pack. it's held in by 2 screws- easy to change.
Some Series II Discoveries has the ACE(Active Cornering Enhancement) option which had an additional hydraulic belt drivem pump, these cars require a larger belt. It is likely that they sold you a belt for a car with ACE
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