The radiator fan does not switch on automaticly when the car reatches max temprature. Tested the fan, it is wortrking when I unplug the censor on the airfilter housing. What has the censor in the airfilter housing to do with the radiator fan. How do I fix the problem? Thanks Bertus

Hi have you checked that the fan is turning on when car reaches temprature,and when it reaches temprature check that the hoses top and bottom of radiater are geting hot, or maybe water pump not working proply, food for thought, hope this was some help.

Fan relay is stuck

No rad fine check the fan is working ,either the fan motor ?? connection to the fan motor ?? fuse ?? relay?? or temperature sensor?? any one of these will cause the fault

Or the thermostat might be faulty which raises the temprature at which the thermostat starts to open. Giving a high reading on the gauge. if it gets too hot you might be at risk of blowing a pype or head gasket. If so replace thermostat. Check for a loose wire to the temp sensor as well. See if the radiator fan turns on when temp rises. If not check a fuse or the radiator fan temprature switch might be faulty.

This does not make sense. The turbo is driven by exhaust gasses. I think you are referring to the thermo switch on the radiator. The car can be switched of and the fan will still run till it reach temprature and then only will it switch off.

check wires to tempature censer, follow wires from fan to censor if there ok replace the censor, be sure to disconnect the battery first.

One or more temprature sensors sends a signal to the cars computer. When a certain temperature is reached the computer sends power to a relay that sends power to the fan. The fan will also come on when you turn on your air conditioning.

Well the first thing I can tell you is that the radiator fan should kick on as soon as you turn on the a/c. That's because of the extra strain it puts on the engine. So, if you don't see or hear the fan go on with the a/c, it's probably dead. You could also unplug the fan and run a jumper wire off of the battery to see if it goes on.

go to a near by workshop

It does have a fan switch, it looks like a bolt head with 2 wires on it. It will be on the radiator near the bottom. Connect the 2 wires together to test the switch.