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07-02-2013, 05:38 PM | #1 |
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HELP: Where is the fan relay and fuse?
is it behind the glove box? Is there another set of relays or fuses? My fan is not kicking in
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07-02-2013, 07:17 PM | #3 | |
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My fan wasn't turning on earlier while the water temps went up and boiled. A few hours later, fan is turning on. I checked all the fuses behind the glove box. I'm at a loss
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07-02-2013, 07:18 PM | #4 |
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I added the Power Distribution block and F61 Fuse location.
http://www.shipkiller.com/Engine_Cooling.html |
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07-02-2013, 07:29 PM | #5 | |
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07-02-2013, 07:32 PM | #6 |
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According to that schematic, there is no separate relay.
It's built into the fan, and may be a solid state relay (it's drawn as a transistor). Pin 1 is power, pin 2 is ground, pin 4 is on/off signal. What I did find during searching is that one of the coolant temp sensors is more likely the culprit. Thanks for the info, Ship. (It's a thermistor, not a varistor. Not meaning to rip. Just saying.) |
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07-02-2013, 08:04 PM | #7 |
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well, I ripped out my passenger knee airbag and found some more bolted down relays up there, but didn't have the willpower to retrieve any of them. I figure if one was burned out, the fan wouldn't be turning on in the first place
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07-02-2013, 08:20 PM | #8 |
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Since it's intermittent, I think you've got a loose connection.
Probably at one of the sensors. Inspect and reseat the sensor and fan connectors. There is no relay. |
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07-02-2013, 08:40 PM | #9 |
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apparently taking the coolant temperature sensor, allows coollant to spray on your face. hahahaha. thankfully it wasn't hot.
I'm getting yellow water temp warnings, which make me think that the sensor is working. Is that a wrong assumption? I re-connected the fan connectors near the top of it
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07-02-2013, 10:17 PM | #10 |
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It means at least one of the sensors is working.
According to the schematic from Ship, and RealOEM, there's a thermistor and a switch. Maybe the thermistor feeds the DME and drives the yellow light, and the switch just turns the fan on and off. Or in your case, sometimes turns the fan on and off. For the price, I'd replace both. Since you've already had your coolant bath. |
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07-03-2013, 05:18 AM | #12 | |
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You did not read correctly. Both are temperature sensors. One reads temperature out of the radiator and one reads temperture at the cylinder head. Both sensors are of the same type according to the WDS. They are not switchs. The DME directly controls the operation of the fan.
Before replacing any sensors I would check to see if the DME is reporting a sensor error and storing a code. I would also check for connector corrosion, loose pins and possible harness issue from the DME to the fan. One thing you have not mentioned. The fan. The fan may have a dead spot in the comutator and may not start if the stator is in a certain posistion but starts in others. Quote:
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07-03-2013, 02:08 PM | #14 |
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Normally on a BMW, you have to replace the sensors because the O-ring had deformed and it now leaks.... If only you could by an O-ring from BMW! You have to source it yourself or buy a whole new sensor.
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07-03-2013, 03:28 PM | #15 |
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the big plug on the top of the fan, with the 3 prongs, isn't getting any power to it..
wish I could find the damn fuse. I'll check behind the airbag again
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07-03-2013, 06:30 PM | #17 | |
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oddly enough, fuse 32 isn't even getting power to it. Tried swapping another 7.5A fuse to it, and still no light on my tester... hmmm. I could have sworn it was working before. Either way, turning the AC on does not start the fan up
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07-04-2013, 11:05 AM | #18 |
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well, here's F61, looks solid to me, and when it was in the car, it was passing electricity to the bottom (non powered) terminal
the other pic is the red terminal in the engine bay, on the firewall. Shouldn't this be a hot wire with electric going to it? For some reason mine isn't. Everything else in the car seems to function other than the engine fan. I'm confused
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07-04-2013, 01:08 PM | #19 |
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Thought so, but as a sanity check, just checked mine and it's 12.52 Vdc with car off, keys out. So yea.
You said you have power on both ends of F61, but "the big plug on the top of the fan, with the 3 prongs, isn't getting any power to it." There's a direct connection from F61 to pin 2 on the fan connector. |
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07-04-2013, 02:44 PM | #20 | |
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odd I'm not getting power at that big red connector on the engine firewall too
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