05-13-2019, 08:07 AM | #23 |
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11-23-2022, 08:05 AM | #24 |
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01-20-2024, 11:50 PM | #26 |
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My M is a track car, all the AC components are removed amd the runs at all times. It is kind of annoying…wonder if this can be coded to bypass the AC and run as temp rises.
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02-11-2024, 12:38 PM | #27 |
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I’ve been trying to figure out why my fan has been running non stop after I deleted my AC. Did you find a solution to this? The one thing I noticed is that the fan only runs when the HVAC is turned on, in my case 84 degrees on lowest fan speed for coolant bleeding.
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02-13-2024, 02:28 PM | #28 | |
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Have not found a solution, deleting the AC caused this, mine pretty much runs at all times. Have thought about replacing the fan, factory fan is very heavy.
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02-13-2024, 02:33 PM | #29 |
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I did find the cause. The fan is running because it thinks the AC pressure is high. I'm sure there's a way to trick the system by running .5V to the signal pin.
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02-13-2024, 02:55 PM | #30 | |
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Very nice, totally makes sense…wonder if this can be coded.
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02-13-2024, 04:18 PM | #31 |
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Problem solved. For some reason I thought that pressure reading was coming from the compressor but it is from a screw in pressure sensor on one of the lines I removed. I pulled that sensor out and plugged it back into the car and everything works fine now. No fan spinning and I am able to bleed the charge coolant system again. I’m not sure what else changes with the sensor missing but I would recommend doing what I did.
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02-13-2024, 04:40 PM | #32 | |
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OMG! You rock… Which lines? Can you share a pic of the line / screw? And what do you mean, bleed the charge cooling system?
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02-13-2024, 04:53 PM | #33 |
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Ignition on, parking brake set, headlights on, heat on max hot with fan at lowest speed, press throttle for 6-8 seconds and the car starts a self bleed mode for the low temp side. Set a timer and the car doesn’t do anything for 6 minutes then the pump cycles on and off. Works good.
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02-13-2024, 05:14 PM | #35 |
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Well…I don’t have any of the AC equipment/compressor/blower/etc. or the control panel.
Not going to work me
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02-13-2024, 10:45 PM | #37 |
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Let me make sure the wiring is still there
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02-14-2024, 03:36 PM | #39 |
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In a similar vein, do you know or how would I determine what triggers the charge air radiator water pump?
Is it a temp sensor, if so, what’s the temp? Is it on at all times? If so, how do I confirm? Does it have any correlation / connection to the AC equipment? I ask, as I sometimes feel that the pump is not running. I am trying to figure out its operations and what triggers it.
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02-14-2024, 04:03 PM | #40 | |
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The following values are used for the activation: Ambient temperature Difference between charge air temperature and ambient temperature The coolant pump receives the setpoint value specification via local interconnect network bus from the engine control. The following pump values are reported back: Current engine speed Power consumption Voltage Temperature of evaluation electronics Fault status Characteristic curve and setpoint values The coolant pump works in the engine speed range of 24 to 6000 rpm. The permissible coolant temperature is between -40 °C and 128 °C. |
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02-14-2024, 08:34 PM | #41 | |
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very insightful, so basically...it will never run when the car is just running/on standing still regarding the engine fan, I am tempted to replace it with a spal or similar with a temp sensor/switch. the oem fan is over 30 #'s...so reducing that weight is a motivation
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