Engine Cooling problem
1997 Chrysler Concorde 6 cyl Two Wheel Drive Automatic 145000 miles
97 Concorde 3.5L, the low speed cooling fans will not come on at 219 degrees. The high speed fans will come on at 230 degrees and go off at 219. I have tried 3 different ECMs and I experience the same problem. I have spoken with the manufacture of the ECMs and they suggested checking voltage drops, this was done and 0.015v was the reading from all grounds and wiring from the ECM to grounds, from ECM to both low and high speed realys. With a scanner connected I can activate both the low speed and high speed relays therefore making the correct fan work. With the engine running and scanner connected I get the following voltage information from the ECT to the ECM: 1.96v=219 degrees NO Low Speed fan operation. 1.76v=230 degrees High Speed fan comes on, then goes off at 1.96v. In addition, I have a 1997 Chrysler LHS with a similiar problem, at 230 degrees it will switch on the low speed fans and not the high speed fans. If I switch these ECMs the problem goes with the ECM.
Thursday, December 10th, 2009 AT 2:15 PM