That’s interesting that you actually needed to ground the compressor case, you’d think it would have no problem connecting to ground through the mounting brackets. Which PWM fan controller are you using? I’m considering going this route as my fans are insanely loud at 100% on.
I was caught off guard with that one too, didn’t think it would need it but apparently my paint job on the bracket was too good to get a good ground. Easy fix none the less
My pwm is from auto cool guy. The website is terrible but it’s easy enough to reach out directly for questions. Very helpful if needed. I’ve been very happy with it and even installed one in my dad’s Mustang. I have the 85amp version on both cars. Wiring is simple and it’s weather resistant enough to be under the hood. It will control the fans from 0-100% as needed and you can limit max fan duty cycle with the knob. As the engine warms up they will increase as needed to control desired temp. Override circuit to run a remote switch to go straight to 100% if needed. Ac control with independent speed setting triggered by 12v so will cycle fans to set speed when compressor cycles even on a cold engine. Fans will run for 1min once car is shut off as a cool down function. I have mine limited to around 60-70% and controls temps just fine on the hottest days. I will probably need to adjust ac fan speed higher to compensate but will see.
I think any pwm fan controller is a must with electric fans. Relays work but it’s either on or off with no in between. If I remember I have the same fans you do and when they are running at full tilt it’s quite loud!
This was the best option I found at the time but there may be better options out there today.
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