Just bought a 110 (K reg) fitted with a disco 200tdi engine. Runs well, but temp gauge quicly moves up to rhs of white band (but not quite into red). Electric fan then cuts in and runs most of time whilst engine running. Radiator and water pump appear OK. Have noted that has 88 thermostat (correct according to LR). Has also got electric fan (Bosch) on relay and thermostatic switch fitted in radiator top hose - not sure of source of switch, but has '90' stamped on it.
Understand that incorrect temp guage readings are common on disco engines conversions, but more concerned re elec fan running all the time. If '90' relates to temp when switch activates - is this not too close to 88 when thermostat opens?
If so, where can I get another thermostatic switch? also can I get a suitable sender unit to match temp guage - think car was originally petrol as has choke pull under dash.
thanks