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Auto Air Conditioning & Heater Repair/Radiator (fans) not comming on

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Expert: - 11/30/2011


Question
Paul;  Thanks in advance for your time.1999 Nissan Sentra 1.6 auto with air. Neither of my radiator fans are coming on. I replaced the relays and fuses. I've checked to make sure the fans are operable which they are. Recently replaced waterpump due to leakage. A/c blows cold air most all of the time. When sitting in traffic it seems to blow less than cold but still working.for sure the fans are not coming on. What else can I possibly check.
Thanks
Kam

Answer
Hello
It sounds as if you have been thorough.
We are a uk company so have no specialist knowledge of your vehicle.
How are the fans controlled ?.
Are they managed by the  ECU or temperature sensitive ?.
It is possible that a temperature sensor is at fault. You need to know whether it has one of these either in the fan assembly or somewhere round the radiator.
Is there power to the fans, if so it could be the fans themselves that have failed.
With the ignition on without the engine running find the feed wire and with a volt meter see what is being fed through. If it is dead feed 12 volts into the cable and see whether the fan runs.
You also have a high pressure switch on the a/c system. Audi for example have a problem with these and that too can prevent the fans from working.
I hope this gives you a bit to go on, contact me again if you would like some more help.  

Auto Air Conditioning & Heater Repair

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Paul Evans/ www.chillywillys.org

Expertise

Any question related to the function or malfunction of vehicle air conditioning excluding model specific problems with the heater controls. We are a UK based company and are unlikely to be familiar with the exact make and model of American vehicles. We will always at least try to guide the owner towards what the problem is likely to be in this instance We may struggle with none specific electrical issues related to the a/c without seeing it but it is likely we could narrow the problem down

Experience

Director www.chillywillys.org specialising predominantly in UK vehicles, fleet, rare and collectables. Although all a/c works on the same principal US vehicles have different controls and electrics. 12 years experience automotive and aircraft air conditioning. This is our sole source of revenue, we see lots of a/c issues that we are able to diagnose accurately mainly down to experience. UK have garages caught on to a potential revenue stream within the last few years but sometimes struggle with the problems as they don't see the issues that often........to be fair they could get their own back and ask me to change a timing belt ! Certain vehicles have known issues, we can help with that and also anything that is obvious to us but not necessarily to the bamboozled owner....... a/c is relatively new here and owners are catching on to maintenance but are sometimes still misguided by inexperienced individuals a bit timid to say' I don't really know

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