Have 2004 audi 2.0 fsi main fan keeps coming on when moving.
Have 2004 audi a3 2 litre fsi,when i,m driving along not in traffic the main fan comes on full bore ,the temp guage is staight up in the normal position,the thermostat has been changed but the fan still comes on once the engine has warmed up ,the air con is not on either .can you help please.
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Re: have 2004 audi 2.0 fsi main fan keeps coming on when...
Because of the shape of the car and temperature within the under bonnet,audi/ vw use the electric fan to maintain a closer tolerance of engine temperature.for maximum economy.so your main fan will come on more often than perhaps an older car that you may have owned.as changing the thermostat has shown no change.
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It sounds like it may be time for a coolant system flush to remove accumulated sludge in the system. You could also have some corrosion if you haven't drained the system and replaced the coolant in several years as it can loose corrosion prevention over time. It may also be a good time to have the thermostat replaced in case it is getting a little sluggish on opening. You can also take your garden hose with the spray nozzle and clean the accumulation of stuff on the condenser and radiator in the front. Some or all these measures should help.
Ok, if you have your A/C working going slow in traffic you did not have enougth air flow througth your radiator, check if fan is working properly and no fan shroud is missing,
Also ... have you change your thermostat? still factory? or it is an aftermarket, well have a shop flush your coolant and repalce your thermostat a factory is the way to go, I always encounter problems with aftermarket thermostats, be on the safe side and keep a healty cooling system, it will pay off.
I am having the same problem on my Audi A4 2004 FSI, lose power whilst driving at speed with the EPC light coming on. Looks like a design fault of some kind with Audi petrol engins, have read a few forums about this but no clear straight answer. Check the link below:
First make sure that the coolant is full,then make sure that your cooling fan is running when the temp gauge is at high.You may have a temp sensor or relay for the fan that is bad,or maybe the fan is bad.The fan will also run when you have the A/C or heater in the defrost position.If you have duel fans one may only come on with the A/C.Well hope this helps.
is the cooling system full,if so you may hve to get the heater core cleaned as they can plug up if the dexcool anti freeze has not been changed,could also have defective thermostat(stuck open)if you have gauge does it go half way or stay low temp,other causes could be stuck air blend door in heater system
yeah try to change the sensor.maybe it is busted. normally, most of the late-model cars comes with a fan feature that turns of after 5 or 10 mins even after switching off the engine. this helps to cool down first the engine to reach its desirable temperature before it is totally shut down. its good that your radiator fan has a feature like that. aftermarket perfomance fans do come with that feature because it takes care of the engine state.just try to change the sensor for engine temp
if ac dont work idleling it start to work when you move our fan is not coming on because when you activate the ac compressor kick in and fan should come on if it start to be cold only when you drive the force air cool the condensor ac work temp goes down HOPE IT HELP FIXYA OUR POST THANKS . PIERRE