Question about 1999 Dodge Caravan
you need to replace the radiator fan relay. located bottom right of the picture shown in above link
the relay is on the drivers side just below the headlight. you have to jack the car up to see it. it's bolted to the body with 2 8mm bolts. that is you have to use 8mm socket. It's black and about two inches square. It's a little hard to see but it is there. hope this helps leave comment.
Posted on Oct 04, 2010
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Posted on Jan 02, 2017
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Trouble Code: P1491 You PCM does not sense current to radiator fan when it turns it on. Is the fan coming on or not? Usually not when you have this code. Problem can be with the fuse, relay, wiring or fan itself. First check the fuse. If good, next try swapping the relay with another one in the engine compartment relay box, such as the horn relay.
Let the car warm up and see if the fan will come on. If yes, get a new relay. If not, either use a test light to see if there is voltage at the fan connector when the engine is on and hot, or else test the fan motor by hotwiring it to the battery. If none of this works, please get back to me for how to troubleshoot the wiring.
Radiator Fan Control Relay Circuit Malfunction
Radiator fan control relay circuit is open or shorted to ground Radiator fan control relay circuit is open (test power to IGN) Radiator fan control relay is damaged or has failed PCM has failed
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