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#1
08-21-2003, 08:47 AM
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radio noise from auxilliary fan?
I have installed a 1.1 k resistor to the auxilliary fan temperature gauge to make it beleive it was reading 105 degree C. It works very well. The auxilliary fan switches on more often but the engine temperature does nor go over 92 degree C.
The problem I have is : when the auxilliary fan runs, there is a noise coming from the speakers that stops as soon as the fan stops running. Is there a remedy for this problem? A condenser , or resistor or could it be a bad ground from the auxilliary fan ? Is there a fix for this noise problem? Thanks for any answers. jacquesrober
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J.R. 
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#2
08-21-2003, 01:28 PM
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Did the noise happen when the fan kicked on before the resistor was added?
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1985 300D Turbo ~225k 2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k 1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k
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#3
08-21-2003, 02:19 PM
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I never noticed it before since the fan was not working very often (it was set to kick in at approx. 110 degree C.
It also is controlled by the pressure transducer on top of the refrigirant reservoir. This would kick in only after a while. Since I listen to music relatively loudly, I would not hear the noise unless it would appear at start up. This now happens more often as the fan kicks in at 92 degree C. Also, after stopping the car and restarting a bit later, the temperature has gone above 92 deg. C the fan then kicks in while the radio is still not loud and I can then hear the noise that stops when the aux. fan stops. The resistor is installed in parallel to the temperature gauge on the engine (under the air filter housing). It is welded to the 2 wires on the plug connecting to the gauge. The resistor is a 1/4 watt 1% film type. Nobody who installed this resistor has mentionned fan noise over the speakers. The fan itself runs noisily enough that I can hear it just barely inside the car. Regards, jacquesrober
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J.R.
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#4
08-21-2003, 03:40 PM
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Ok, I saw this somewhere just in the last week or so...
You need to check and see if the fan bearings or armature ( if is has one ) are worn... One person on here put new bearings on some aux fan for about $7.... dont' know if you have same model... If the bearings are good then you need to check the armature.. and the brushes... if the brushes have been replaced then the copper may have worn down enough that the mica between the copper parts of the armature are above the copper.. thus causing the brushes to come off contact with the copper producing a spark... edit... now I rememeber where I heard this this week,, it was Pat Goss on " motorweek' on PBS.... Last edited by leathermang; 08-22-2003 at 02:04 PM.
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#5
08-22-2003, 07:03 AM
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Thanks, I will check these things over the weekend and come back monday with the diagnostic.
Regards, jacquesrober
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J.R.
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