Normal running temperature
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.
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.