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#1
01-20-2006, 12:15 PM
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aux. fan fuse blown (420 SEL) 89
my fuse to the aux. fan has blown , could anyone tell me why this fuse would blow & does this fuse power anything else ? Also I hav a high idle, car starts fine. the idle is at 1000 but after it warms up it goes to 1200-1500rpm, when the car is put in gear the rpm goes to 700-900.
thanx for any replies
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420 sel 168,000 1989 
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#2
01-20-2006, 03:43 PM
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try running 12 V direct and see if she turns, may be bound, may need lubed, may be toast (use ATF) , not sure about idle, need a bit more info, oes it come back down, is it going up and down?
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Ron 2015 Porsche Cayman - Elizabeth 2011 Porsche Cayman - Bond,James Bond Sadly MERCEDESLESS - ALways LOOKING ! 99 E320 THE Queen Mary - SOLD 62 220b - Dolly - Finally my Finny! Sadly SOLD 72 450SL, Pearl-SOLD  16 F350 6.7 Diesel -THOR 19 BMW X5 - Heaven on Wheels 14 38HP John Deere 3038E Tractor -Mean Green 84 300SD, Benjamin -SOLD 71 220 - W115-Libby ( my first love) -SOLD 73 280 - W114 "Organspende" Rest in Peace 81 380 SL - Rest in Peace
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#3
01-21-2006, 01:36 PM
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no the idle does not go up & down it stay up until I put in gear then it goes to 700-800 when for on the brake. when the car is stopped and put in park idle goes back to 1400-1500 .
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420 sel 168,000 1989
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#4
01-23-2006, 09:08 AM
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Natural for idle to lower when in gear. Cold idle will also be higher than warm idle. May be correct, do you have idle specs. Check against those before you adjust. May be something as simple as cold idle adjustment, blocked air filter, or PCV.
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Ron 2015 Porsche Cayman - Elizabeth 2011 Porsche Cayman - Bond,James Bond Sadly MERCEDESLESS - ALways LOOKING ! 99 E320 THE Queen Mary - SOLD 62 220b - Dolly - Finally my Finny! Sadly SOLD 72 450SL, Pearl-SOLD 16 F350 6.7 Diesel -THOR 19 BMW X5 - Heaven on Wheels 14 38HP John Deere 3038E Tractor -Mean Green 84 300SD, Benjamin -SOLD 71 220 - W115-Libby ( my first love) -SOLD 73 280 - W114 "Organspende" Rest in Peace 81 380 SL - Rest in Peace
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#5
01-23-2006, 10:30 AM
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The fuse would blow because too much current passed through it. Either there is a short or the motor may have gotten bound up a little and sucked more current perhaps. Replace the fuse and see if it happens again. If it doesn't then leave it alone. If it repeatedly blows the fuse, then you have a problem.
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Ali Al-Chalabi 2001 CLK55 1999 Dodge Ram 2500 Cummins Diesel 2002 Harley-Davidson Fatboy Merlin Extralight w/ Campy Record
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#6
01-23-2006, 06:19 PM
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High idle...
...probably our most common inquiry:
1) Fuse on top the OVP or the OVP itself 2) Dirty or dead idle control valve 3) dying or dead idle control unit Above in order of expense to replace. Do a search in the forums for in depth info on location and procedures for your model. here's hoping its the 10 amp fuse on the OVP  Kevin
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"Dangerous with a wrench...and not smart enough to know it" Stable (in order of acqusition): '84 500SL, 280SEL (Euros) '77 280SE. '90 560SEL '79 450SEL 6.9, '95 C280 (totalled by daughter 8/07) '81 280SL (rescued) '88 300CE '86 560SEC '95 C36 '01 CL55 DD's: '04 S500 4Matic (SWMBO) '04 F150 Crew
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