mmmmmkay. There's at least two types of compressor fitted to the N52. With and without magnetic clutch. BUT, I think they're both PWM controlled (at the compressor), not CAN.
https://www.underhoodservice.com/bmw...c-compressors/
Here are the models that got the clutchless:
and here are the models that got the clutch:
the e85 has it's own part number, so who knows what's going on there:
https://www.realoem.com/bmw/enUS/par...&q=64509182800
BUT the clutch doesn't stop it from being a variable rate pump. The clutchless pump is always turning, but can vary the pump geometry so it isn't actually compressing. I think the clutch just ALSO disengages so the bearings in the pump don't wear, and that was added on the later models??
Here's the thing... if the control is PWM I *think* we just need to know the voltage. If it's "off" the modulation is 0, and "on" the modulation is 100. Am I crazy?
https://www.underhoodservice.com/bmw...c-compressors/
Here are the models that got the clutchless:
and here are the models that got the clutch:
the e85 has it's own part number, so who knows what's going on there:
https://www.realoem.com/bmw/enUS/par...&q=64509182800
BUT the clutch doesn't stop it from being a variable rate pump. The clutchless pump is always turning, but can vary the pump geometry so it isn't actually compressing. I think the clutch just ALSO disengages so the bearings in the pump don't wear, and that was added on the later models??
Here's the thing... if the control is PWM I *think* we just need to know the voltage. If it's "off" the modulation is 0, and "on" the modulation is 100. Am I crazy?
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