Question about 2002 Volvo S60

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Volvo Cooling sensor / fan arent working

I have a 2002 volvo s60 2.4 turbo i just purchased and the temp guage doesnt work, the fan wont run and the car has issues starting. I believe the cooling sensor was just replaced. When the cooling sensor is plugged in it will not start and when it is unplugged the car will start but it turns over for a bit before it will fire up. I believe the injectors are kicking too much gas out. I heard that the module may be bad and need to be replaced or reprogrammed. Not sure if the cooling sensor is linked with a module or not or what my next step should be to get the fan to cool the engine and the car to start up when the sensor wire is connected. Thanks

Posted by Anonymous on

  • Anonymous Aug 12, 2008

    Thanks for the fast reply! The sensor was just replaced. I believe it was an IAT Sensor on the receipt or also called the cooling sensor directly left of the injectors. When this is plugged in we tried to get it to start and it wouldnt go. Just kept turning over, When the wire was unplugged from the sensor it dumps some extra fuel but we got it going after about 3 -5 seconds of turning over. As of now i left the sensor wire unplugged and it starts pretty good but i dont think its getting good milage ;) due to the injectors dumping fuel. Hope i didnt mis understand your answer, let me know if i did as i dont know much about this problem. Hopefully this gives you a better idea of what is going on. The other problem i was told is that the module is bad its a bosch hs2 and that controls this and the engine fan. thanks again

  • Anonymous Aug 13, 2008

    i can replace the sensor, i know which one it is, supposedly it was replaced at one point and didnt fix the problem. is the engine coolant temperature sensor related to the fan not turning on to cool the engine? volvo said that the ecm needed to be replaced which was 1600 bucks. the previous owner walked out when he heard that and sold the car to me. so when i spoke with the dealer they sounded pretty upset and just said the ecm replacement was what needed to be done. everywhere else they say that it shouldnt be the computer that is the problem its rare that the ecm goes out. i dont know if im talking about 2 seperate issues here with the ect sensor that causes the car to not start when plugged in, temp gauge inside wont read anyhting, and the cooling fan wont turn on when plugged in. anyone know if these three problems are related? i have the computer printout from volvo dealership with the 5 issues the computer triggered if that helps. thanks again



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My air conditioner or fan turns on when the car gets too hot. It doesn't happen every time but often enough to drain the battery. It is a 2001 Volvo S60 turbo. I don't know where to start.

Posted on Jul 14, 2009



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Take it one step at a time. First, replace the coolant sensor and try to get the car to start WITH the sensor connected. Make sure that you DO NOT use any teflon tape when installing the switch (this will isolate the switch which will not ground it, making it not work). Th computer receives signals from numerous sensors, and makes adjustments according to inputs received. When the computer gets a signal that the car is still cold, it will adjust the fuel/air ratio to make it run richer (more fuel than air). Once the car is running it will run rough due to a improper mixture since the computer is never sensing the car is warmed up since the sensor is unplugged. This will also account for the slow start due to a richer fuel mixture.

Posted on Aug 12, 2008

  • Anonymous Aug 12, 2008

    An IAT sensor can be many types of just means it is some type of temperature sensor.My guess would be that your car has a bad engine coolant temperature sensor for the fuel system. You would need to check the sensor's resistance reading and compare it to its specified range. Being that the car starts fine without the sensor connected, I'd bet the sensor is bad (I've seen many bad "new" sensors). Once you get the car to start with a good sensor connected, the car should run toatally different once the proper signals are receoved ny the computer which weill adjust the other components accordingly. Not sure which module you are referring to, but again, one thing at a time and get the car to start with the switch connected first.



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