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#1
03-09-2014, 07:05 PM
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89' 300E Blower fan stuck full on
Anyone know why the AC/Heater blower fan would go full on and not shut off when the ignition is turned on? All the climate controls seem to working. The fax controls do nothing.
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#2
03-09-2014, 09:59 PM
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Quote:
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1989 300ce 129k ( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone) 1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus 1994 e320 Cabriolet 108k  1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it [/SIGPIC]
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#4
03-10-2014, 08:15 AM
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[QUOTE=Netconn;3298780]I did it about two years ago when I installed a new regulator, guess they don't last long.[/QUOTe
yes, i guess if you buy cheaper ones (like I do) the risk is greater that they won't last... the only other issue i can think of is your ignition switch. you can try backing off the key a millimeter after you start.... but your problem doesn't seem to be an ignition switch issue... but it is a no expense and no time trouble shoot
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1989 300ce 129k ( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone) 1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus 1994 e320 Cabriolet 108k 1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it [/SIGPIC]
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#6
03-10-2014, 10:43 AM
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There is a 3 terminal connector behind the brake booster that goes to the blower regulator. It has a heavy black and red wire and a lighter yellow wire. The yellow wire is the control signal for the regulator and varies from about 1 volt (low speed) to about 6 volts (high).
You can check voltages with a voltmeter or unplug the connector and remove the yellow wire and see if blower still is at max. If you replaced the regulator 2 years ago with a quality replacement and it is gone again, then your blower might be drawing excessive current due to dry bushings or worn brushes and commutator.
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#7
03-10-2014, 04:51 PM
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The fan does squeak for a few seconds when it first starts up. I oiled it last time it was out, maybe I need to try a different oil then LPS. It's blowing hard so I know the bearings aren't sticking. I was going to meter the yellow wire as soon as I get a few minutes but I'm thinking it's the regulator again. It's not the expense as it is the work replacing it.. I think this time I'll make the modified W140 regulator.
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