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  #1  
Old 05-25-2009, 06:15 PM
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99 E300D aux fan dont come on with a/c

aux fan donot come on with a/c, I have to manually turn them on overide climate control , just had new compressor put in and dryer by shop plus switch on dryer because they thought switch was bad , went to pick up care **** ,they had my whole light assembly out had my car for 3 days and still cant fiquire out whats wrong they say fan module is ok ,any thoughts ?
thanks brian

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  #2  
Old 05-25-2009, 06:45 PM
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You do realize the aux fan only comes on when certain conditions are met, right? It's not just supposed to come on when you turn the A/C on, it only comes on when the refrigerant pressures or temps exceed certain thresholds.
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  #3  
Old 05-25-2009, 07:11 PM
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the aux fans always came on after turning a/c slight delay atleast my car/ now they dont and a/c isnt as cool as it should be with out until u turn on fans? they just dont come on at all without over riding it
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Old 05-25-2009, 08:17 PM
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Marty is correct; yours was not operating correctly if it did what you claimed previously.

Mine only comes on when I exit the freeway on +100F days and enter into stop and go city traffic. This creates a spike in coolant temps to 95-100C at which time the aux fans engage. Is very noticeable.
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  #5  
Old 05-25-2009, 09:52 PM
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You do mean idling, right? In what temperature? At 90F, my car won't idle for long without demand for the auxiliary fan.

You may be a bit low on refrigerant. But don't just blindly add the stuff. At the very least, check the high-side pressure. Note the temperatures: ambient, interior and vent.
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  #6  
Old 05-25-2009, 10:49 PM
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95-100 degrees omg car did that once when clutch fan was going hardly over 85-88 degrees on hot days, never the less still with problem the auxfans dont come on at all with a/c on?

Last edited by 99E300d; 05-25-2009 at 11:02 PM.
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  #7  
Old 05-26-2009, 08:37 PM
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Will low refrigerant pressure cause EC to stay engaged? I know there is a leak in the compressor. We have had the EC "on" for some months, as we did not want the refrigeration to operate during the winter. Now when we try to turn off the EC to allow the ACC to cool, the EC red LED stays on. Thanks. Steve
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  #8  
Old 05-26-2009, 09:06 PM
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Yes, being low on refrigerant will cause the EC lamp to remain lit.
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  #9  
Old 05-26-2009, 10:51 PM
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Quote:
Originally Posted by 99E300d View Post
95-100 degrees omg car did that once when clutch fan was going hardly over 85-88 degrees on hot days, never the less still with problem the auxfans dont come on at all with a/c on?
Have you checked to see if the ribbon belt isnt tangled and binding the drive side motor?
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09' Hyundai Santa Fe Diesel 48k (S.A.)
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  #10  
Old 05-27-2009, 06:59 AM
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On mine the aux fans will run slowly under some conditions...say it is moderately warm out 80*F and I come to a stop at a light...then the fans will kick on and the longer I idle the faster they will turn but they don't really go all that fast unless the conditions are extreme (pressure or temps). But, when I turn the system on and it is not really all that hot out the aux fans don't turn at all and they shouldn't turn. They are meant as a means of extra air cooling of the condensor not to provide constant airflow whenever the A/C is on. I think you can monitor the current to the fan motor from the console.
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  #11  
Old 05-27-2009, 10:19 AM
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Perhaps Matt could remind us of the CCU commands used to engage the AUX fans so you could confirm whether or not they work?
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09' Hyundai Santa Fe Diesel 48k (S.A.)
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  #12  
Old 05-27-2009, 10:27 AM
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Press and hold both AUTO buttons for >10 seconds.
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  #13  
Old 05-27-2009, 04:03 PM
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Thanks, Matt. I'll get a recharge and go from there. Summer is coming. Steve
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  #14  
Old 05-28-2009, 12:12 AM
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Quote:
Originally Posted by TMAllison View Post
Have you checked to see if the ribbon belt isnt tangled and binding the drive side motor?

the fans spin freely and come on when you overide, to add insult to injury inside blower is starting to act funny,dont come on then eventually comes on sounds like blower regulator argh bad yr for the old mb lol
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  #15  
Old 05-28-2009, 12:59 AM
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Monitor whether or not the blower comes on when you hit bumps or if given time. I replaced my reg beacuse the blower was intermittent when the motor was at actually at fault.

If you suspect this to be the case, remove the kick panels and expose the motor and squirell cage fan. When the CCu is on Auto and showing the fan should be spinning, reach under and give the squirell cage a 1/2" nudge clockwise and see if it fires up. If so, its the motor. Stops on a brush dead spot........Len S. determined it is possible to replace the brushes although the motor IS sealed.

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09' Hyundai Santa Fe Diesel 48k (S.A.)
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