Continued WJ power steering/cooling fan issue...
I posted a while back identifying an issue I have been having with my wife's '04 WJ with the 4.7 V-8 and hydraulic cooling fan. We had noticed that the power steering was weak when idleing in drive. Ended up changing the pump out with a Napa Reman unit ($93.00). Power steering felt great and a nice side bonus, the cooling fan would really spin fast when the jeep was warmed up and the AC was on high. Unfortunately that pump started leaking out the fron seal after a month. I got another pump from Napa as well as another pulley (they are one time use). Changed it out on Wed. night after work. Air bled the system and low and behold, the new pump felt worse than the original one in terms of weak power steering. So last night I got a third reman pump from Napa and a third pulley. Changed it last night. Now the steering feels fine, but the cooling fan doesn't seem to want to get into the high speed when the engine is warm and the AC is on.
I have the technical service manual and it states that the fan speed is determined by 4 things, the engine temp, ac head line pressure, trans fluid temp and battery temp (?). Here is my simple question. For those of you with V-8 WJ and hydrualic cooling fan, does your fan spin at a faster rate when the engine is warm and the AC is on high/recirculate? It seems to me like it should but this third pump does not seem to provide enough flow/pressure to make this happen. If it supposed to, I think I am going to bite the bullet and buy a brand new Mopar unit. Ouch!
Thanks for any adivce,
'78 Cherokee Chief: 360/TH400/NOS QT, '04 Grand Cherokee: 4.7/545RFE/242HD w/SYE, JK Rubi front axle, 4.56 gears, Protofab rear bumper/tire carrier