On my previous 99 Suburban 2500 7.4L I can recall the fan never coming on also. I would tow my trailer with the AC on and never noticed any too hot coolant temps. On this 96 version I notice it comes on at a certain temperature not necessarily only when the AC is on.
On a sidenote BenK does the trans fluid get cooled only in the external trans cooler or does it go through the engine radiator also?
* This post was
edited 05/24/12 05:58am by rowekmr *
03 Ford Excursion Ltd 6.0L ARP studs/HG, 6.4L banjo bolts, blue spring mod, coolant filter, K&N CAI, turbo back exhaust, IDP tunes, SCT Livewire
00 Acura RL
08 Jayco 31 BHDS G2
96 Regal 258 Commodore
My old 93 K2500 had a oil cooler like the one Ben posted in his Picture on the drivers side and did not have a trans cooler from the factory. I moved the oil cooler down and installed a B&M trans cooler with fan above the oil cooler. The Aux fan would come on with AC. If temps are an issue and you have a factory copper 4 core radiator replace it with a good 4 core aluminum one. This will cool much better. I made this change on the 93 and made a big difference. The Trans cooler with fan helped keep it cool when towing at slower speeds when the trans TC was unlocked and creating heat. It also supplemented the other two fans.
1997 Ford F250 Extended Cab, 7.3 Diesel, 8 foot bed.
Reese 16K Hitch
(Moved into Shed) Hensley Arrow
Jordan Brake Controller, Hensley TruControl Gold Shelved.
Open Range 5th Wheel, Roamer RF392 BHS
My electric fan has only come on rarely, and only under extreme temps. It is not supposed to come on just with the AC. Earlier GM vehicles with less sophisticated electronics did use a temp sensor for the condensor fan, but on the 2500 and 3500 trucks this is an auxilliary cooling fan, not a condensor fan.
Due to the recent economic down turn, rising energy costs and mandatory labor cuts, the light at the end of the tunnel has temporarily been shut off.
Don't know how the GM's work but every Chrysler I have had and my DD Volvo the fan comes on with the AC. They also stay on after the vehicle has been turned off. Heck on the Volvo the fan will cycle on and off up to an hour after the it's been turned off and sitting in the driveway. Was told by Volvo SM that it's normal.
* This post was
edited 05/25/12 02:02pm by Perrysburg Dodgeboy *
Perrysburg Dodgeboy 2004 Dodge Ram 2500 Quad Cab SLT Cummins HO
2005 Keystone Cougar 304 BHS SOLD and looking.