Normal running temperature

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Listed below are temperature ranges from by SELOC members from their stack display within the car.

Model Engine Modifications from Standard Motorway (70mph) type crusing range (deg C)
S2 1.8 Rover 'K' Standard 96-97
S2 1.8 Rover 'K' Eliseparts remote T-stat 82-84
S2 2.0 Honda K20 Eliseparts Hi-Pressure Alu rad 84-86
S2 1.8 Toyota 190 Standard 83-86
S2 111S 1.8 Rover 'K' 89-91
S2 111S 1.8 Rover 'K' Eliseparts Hi-Pressure Alu rad 85-86
S2 111S 1.8 Rover 'K' PRT with PEL500150 84-85
S1 1.8 Rover 'K' Rover PRT 82° stat 80-81
1999 S1 1.8 Rover 'K' 86


The service manual states the fans at the front should automatically switch on when the coolant temperature rises 101/102°C. The temperature should then fall and the fan switches off when the temperature drops below 98/96°C.

Temperature senders

The S1 has two Temperature senders: brown (sends to ECU), blue (sends to dash). The blue temperature sender is notoriously unreliable and often fails, resulting in temperature readings approx 10°C lower than reality. The blue sender is also a "single wire" type which is affected by electrical load. In most cases, a 1°C rise in temperature can be seen when turning on each item of electrical equipment, e.g. headlights, heater fan, windscreen wipers.

The S2 (Rover engine) has a single (black) temperature sender for both ECU and dash.

The S2 (Toyota engine) has ???