Chrysler Repair: 1999 Concorde left radiator fan doesnt work, 1999 chrysler concorde, chrysler concorde

Question
I have a 1999 Chrysler Concorde, 2.7 L engine.  I noticed that the left  radiator fan never comes on, even on the hottest day (95 degrees here lately), and with the A/C running.  The car doesn't overheat and the temperature gauge shows a consistent good running temperature.  I my A/C is working decent since I recharged it lately, although it could be cooler.  The fan blade turns easily, and doesn't seem loose.  My Haynes repair book gives me the impression that both radiator fans run together, and are either on low speed together, or high speed together, depending on what the sensors might be telling them.  I was told that the relays are all the same, and to try to switch the relays to see if it makes the fan run.  would you suggest this?

Answer
Hi Bob,
While I am not certain about the '99 model's fan controls, my 94 Chrysler manual and the 93-97 Haynes says that one fan is low speed and the other high speed. They are called into service depending upon the temperature of the engine coolant, with the low speed coming on at 210F and the high speed joining in at 230F, with the proviso that the low speed fan will come on at any temperature when the AC is called for. Thus the left fan may not be coming on because the temp is being controlled adequately by the low speed fan.
If you want to check the left fan you could jump 12V directly to the fan from the battery as described in the Haynes. If you want to test the relays, then switch them or test them electrically as shown in the Haynes. If you want to test the fan temperature control you could try putting some cardboard in front of the radiator intake( the front surface, probably will require you to slip it in place from underneath the car) to block the air flow while idling the car and carefully watch the temp to rise higher on the gauge and see whether the left fan comes on or not when it approaches the H mark. Don't forget to remove the cardboard after the test.
That should provide a full test for your satisfaction.
Please let me know what you learn.
Roland