Quote:
Originally Posted by ChampagneSW2
I can't say for certain this applies to every vehicle on the road, but every one i have owned turns on the condenser fan no matter what when the button is pressed. Literally, the fan is in the circuit for the A/C so there is no choice in the matter. When the button is pressed, condenser fan turns on. Most A/C diagnosis charts tell you to look at the fan when pressing the A/C button as that shows whether the circuit has power or not.
aerohead you are right at 55 mph it should get adequate airflow but there is no logic to prevent it from coming on based on speed, temp, etc.
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Maybe some
logic circuits need to be added in this case.?.
How about the AC fan only comes on IF the radiator temp is 200 deg (or more). Where main radiator fan voltage is already on..
Maybe the AC fan would never come on if you were zipping down the highway at a good clip.?.
My guess is. Better MPG!
Edit:
I just looked up the diagram. The relays for both fans are hardwired in parallel. They will always come on together. I wonder why they just didn't use one relay? Or maybe just a larger fan?
Maybe I could try a test switch to open the lines to those two motors
when I'm out on the highway.. And see how the AC would work without those two motors running.?.