QuestionQUESTION: Im having problems with my Chrysler sebring 2003. it is a sedan 2.4 liter double camshaft.
When the AC is on the radiator fans are working intermittently for in intervals of 5 or 10 secs. They don't stay on and the car's temp rises half of the way, and the car feels heavy. The AC works fine and the compressor doesn't stop working. I have replaced the body control module, the engine coolant sensor (that is near the thermostat), the thermostat itslef (it was broken when I checked), and the fan relay, and it does not work. I'm lost. Thanks in advance.
ANSWER: Hi Jose,
It could be that fuse #23 (20 amp, third from the inboard edge of the box, back row of fuses) has a small subtle crack in it such that when current flows throught it, when it is activating the fan relays, the crack 'opens' and cuts the current flow. Usually the fans are supposed to be on all the time when the AC is requested. So check out that fuse.
By the way, do the fans come on when you aren't using the AC but the temp of the coolant requires the fans? If so, do they fail similarly after 5 to 10 seconds? or is this something that only happens when the AC is needed?
So check that fuse and let me know.
Roland
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Thanks
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QUESTION: It did not work. I replaced the fuse and they keep acting the same way. and yes, it only happens when the AC is on. Without the AC the fans kick in as required the stay on for little over a minute. please advise
ANSWER: OK, if they only run for a minute, unless that is sufficient to cool the coolant temp sensor so it then tells the pcm to turn off the fans which I doubt is always the case but I can't be sure,... then I have another fuse for you to check: #12 (40 amp on the outboard end of the box, rear row) for the same possible crack problem. That fuse powers both fans if the relays ask it to, like the smaller fuse that powers both relay actuation coil which you checked out. Each relay has its own pcm control wire so I doubt it is a wiring issue with the relays. If you have a voltmeter verify that fuse #12 is putting through its 12v supply when the fans won't work (another way to test the fuse).
Roland
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QUESTION: I don't have a voltmeter but I replaced the fuse with a similar one and the fans keep on doing the same thing. Please advise.
AnswerThe fans will cycle on and off even with air conditioning in action depending upon two things: the coolant temp AND the AC refrigerant pressure. It could very well be that the action of the fan(s) is either cooling the coolant, or lowering the pressure in the refrigerant so as to not require the fan. So if you aren't overheating I would just go with it. I don't see any other reason for the fans to cycle other than that, and the things that you tried and I suggested related to the wiring/circuit components. Up to 3/4 scale on the temp gauge is considered in the normal range.
Roland
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