Just pondering something here, would like input from the membership.
How my 91 350SDL was set up from the factory:
Dual pusher electric fans kick on to low speed with AC high side is over 250 PSI.
Fans kick on to high speed when coolant temp is over 110*C.
Simple mod I have done:
Temp sensor mounted on ABS unit turns the fans onto low speed when the receiver / dryer or engine bay is above ~90*C. It is wired in parallel with the AC high pressure switch.
The fans move a lot more air on high speed. I have an upgraded alternator, and the fans draw 16 amps on high so that won't be a problem.
I'm thinking of either doing:
A) High pressure switch or 110*C coolant temp kicks the fans onto high speed, engine bay / AC temp over 90*C kicks fans onto low.
B) High pressure switch kicks fans onto low. Engine bay / AC temp or coolant temp kick fans onto high.
I'm thinking of going with B, as I really only want the fans blasting away on hot hot days.
Any input?
Thanks,
-Jason