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)
S3 S (220) 1.8 Toyota 2ZR Standard 92-93
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
S1 1.8 Rover 'K' 87-89
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. There is a legacy blue housing, part #A111E6047S as in the S1, but it does nothing.

The S2 and S3 (Toyota engine) has a single black temperature sender, although different part numbers in the 1Z and 2Z engines.