Lack of Cooling Fans

[gazza]

Hello, that is the right sensor and you will lose coolant when you undo it.

You will probably break if not careful as it is difficult to get on.

I tried all sorts of tools and ended up modifying an old box spanner to suit by squeezing it in the vice.

The fans have a 30A slow blow fuse next to the battery.

Try wiring 12V straight to the rad fan to see if they work,connector just behind the fan and rad.

[mikeonb4c]

i have followed mikes tip and fitted a switch to run the scavenge fan and whilst it may not directly cool the engine it definitely keeps the bay cooler which is a real plus on hot days in slow traffic.
i do agree it will not cure any overheating problems .

Thats about the size of it Rob, and I've not identified a down-side to it yet. Go on Mike, go for it

[Grahame at work]

Hi Folks,

Don't forget that the rad fans are 2 speed. if you unplug the sensor the ECU will drive the fans in 'high speed' mode. To check if the fans operate at 'normal speed' switch on the A/C.

So if you have a problem with the normal speed circuits - which is a single relay contact to both fans - you may not see this if you unplug the sensor as the ECU will operate the 2 other relays for high speed - one in the supply line and one in the return line thus connecting the totally seperate high speed motor coils.

I would recommend turning on the A/C and note both fans are opperating and remember the noise it makes - then unplug the sensor and you should hear a louder noise as the high speed circuit comes in (both circuits are on at the same time)

You can monitor the voltage across the sensor or from the ECU terminal to ground and it should be around 3 volts cold down to 0.5 volts hot (or even lower if very hot)

Regards Grahame