3 replies to this topic

[Ken1952]

Mini was acquired in 2003 and since then has averaged 500 miles per year. Current mileage is 23,700 miles.

 

·         Fuel injection model with engine management ECU and a front mounted radiator with auxiliary fan.

·         For many years, the auxiliary fan tended to cut in very regularly.

·         The engine runs fine but now, when it gets hot, the auxiliary cooling fan does not kick in and it overheats.

·         Have replaced thermostat, temperature sensor, pressure cap and flushed out the system and made sure that there is no airlock in the system.

·         Took it to a Rover specialist who said it probably was a blown head gasket.

·         We lifted the cylinder head and replaced the gasket.

·         There was no evidence of any leakage with the old one.

·         If the temperature sensor lead is disconnected, the fan runs continuously and there is no overheating.

·         Haynes manual states that operation of the auxiliary fan is controlled but the ECU.

 

Is replacement of the ECU the only solution or have we missed something?

How easy is this to do?

Alternatively, if it is run without the sensor lead connected, would this cause any issues with the overall running as the ECU would not get any indication of the temperature?

 

 

[Steve220]

The fan HAS to kick in to stop the MPi over heating. I'd look into the wiring between the ECU and the CTS.

[Quinlan minor]

Does it have the Rover fix extended connector for the temperature sender? The original wire was a little too short and got stretched, by engine movement, causing all sorts of problems.

Does the temperature gauge appear to read normally?

Check the output (Resistance) from the temperature sender at cold, normal and hot.

[Sound Engineer]

Hi guys,

 

The OP is my dad and I've been trying to sort this problem out with him for years!

 

I'm intrigued by this extension connector, I'd never heard of it before, so I'm pretty sure it doesn't have one.  Is it just an extra cable link to put in between the original loom and the sensor?

 

The temperature gauge tends to read as expected, is that reading taken from the sensor on the stat, or another sensor?

 

I've previously checked the output of the sensor and the resistances are as expected, plus we've swapped out the sensor itself and nothing has changed.