PCM controlled fans vs. BMW temp sensor....
09-30-2018, 12:47 PM
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PCM controlled fans vs. BMW temp sensor.... What is everyones opinion on the PCM controlled fans vs running a separate temp sensor? I admit I was confused, and put in a BMW temp sensor and wiring, and the Volvo fan relays with Ford Windstar fans. I also have Vintage Air and am going to be putting in a trinary switch to run A/C.
In hindsight, I always wanted to have the PCM control the fans, seems simple and less things to go wrong. Somewhere along the way I got caught up in thinking I needed a separate temp sensor to run the fans.......(which I questioned knowing I already had one in the drivers side head controlled by PCM)
I want to know whats the best route, keep the separate temp sensor and keep it separate from PCM, or wire the PCM to the Volvo fan relay and leave out the extra temp sensor?
In hindsight, I always wanted to have the PCM control the fans, seems simple and less things to go wrong. Somewhere along the way I got caught up in thinking I needed a separate temp sensor to run the fans.......(which I questioned knowing I already had one in the drivers side head controlled by PCM)
I want to know whats the best route, keep the separate temp sensor and keep it separate from PCM, or wire the PCM to the Volvo fan relay and leave out the extra temp sensor?
09-30-2018, 01:41 PM
#2
I don’t see any reason not to use the PCM, there are 2 separate outputs and the on/off temps are fully adjustable if you have any kind of tuner - even a fairly basic handheld can adjust them.
