2002 4.7 Radiator Fan Relay code (P1491) - DodgeTalk : Dodge Car Forums, Dodge Truck Forums and Ram Forums
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slamnnn
 
  2002 4.7 Radiator Fan Relay code (P1491) - Posted: 01-08-2008, 10:57 PM
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Post #1

According to my 2002 Service Manual, this code comes up as Radiator Fan Relay Circuit. Under description of DTC, it has an open or shorted condition detected in the radiator fan control relay control circuit. This includes PWM solid state relays. I don't have a code reader. I did the ignition key on/off thing, so I'm not sure where to start. I can't find this relay to check it. Has anyone seen this before or knows where this relay is?
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bnii
 
 Posted: 01-09-2008, 01:03 AM
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Post #2

I have seen it, twice. I just had the same thing this week. Its a 25amp mini fuse in the panel under the hood. second row on the left, first fuse. Pull it and you will see its blown. the fan got wet, and blew a fuse. Here is my story from this weekend.
http://www.dodgetalk.com/forums/showthread.php?t=187900
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MikeHTally
 
 Posted: 01-09-2008, 06:19 AM
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Post #3

So the 4.7s have electric fans? Cool!
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JeffB2002
 
 Posted: 01-09-2008, 07:58 AM
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Post #4

Quote:
Originally Posted by MikeHTally
So the 4.7s have electric fans? Cool!
electric fans on the the A/C condensor not the radiator.
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slamnnn
 
 Posted: 01-10-2008, 12:17 AM
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That was it. Thanks I replaced the fuse then had to remove the battery cable to get it to reset. It took it a while to idle but the light is now out and all is fine. Thanks again.
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bnii
 
 Posted: 01-10-2008, 12:28 PM
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Glad we could help.
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MikeHTally
 
 Posted: 01-11-2008, 11:03 PM
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Post #7

Quote:
Originally Posted by JeffB2002
electric fans on the the A/C condensor not the radiator.
Aha. I even looked at a friend's 4.7 today to find the electric fan. His cooling fan is ye olde conventional. I know the A/C fan is electric.
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bnii
 
 Posted: 01-12-2008, 02:04 PM
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Post #8

If you guys want to put an electric fan fir the radiator on a 4.7, then look through the threads for viper fan install. I put a Lincoln Mark VIII fan on my 4.7, and it never even needed the high speed fan. I installed a 218 degree thermal fan switch that kicks the low side fan on, and it kicks off after less than a minute. It really is a worth while upgrade. Less drag on the engine, and anything helps when you go with 22's or more. Easy to do, but time consuming if you anal about how clean the install is like I am.
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