fans never run
Mine has an issue like this and I ran a jumper wire on the relay's and they kicked on. The weird thing is I replace the relay 3 times and it doesn't work.....Why would a wire cause the fans to kick on but 3 new relays don't do it....Where is the signal coming from to energize the relays??? PCM right? I changed out my sensor on the block and that didn't work so what would my problem be....Hell I ran straight power from the fans and both worked, jumper wire works but 3 new relay's don't allow them to turn on??????
TECH Enthusiast
Joined: Nov 2004
Posts: 660
Likes: 0
Mine has an issue like this and I ran a jumper wire on the relay's and they kicked on. The weird thing is I replace the relay 3 times and it doesn't work.....Why would a wire cause the fans to kick on but 3 new relays don't do it....Where is the signal coming from to energize the relays??? PCM right? I changed out my sensor on the block and that didn't work so what would my problem be....Hell I ran straight power from the fans and both worked, jumper wire works but 3 new relay's don't allow them to turn on??????
Well ok the head, it was 2 years ago when this happened and haven't messed with it since. My car has yet to get hot enough for me to do the jumper wire crap...As far as the AC thing, the charge was drained and not recharged after the cam swap so I highly doubt that will work right?
On The Tree
Joined: Nov 2007
Posts: 130
Likes: 0
Correct.. first the PCM has to see some pressure (refrigerant) in the system from the A/C sensor (at least one 12oz can) to pick the A/C clutch. Then when it sees higher pressure (compressor working) from the A/C sensor it will send the low speed or 'Fan 1' signal (ground) to the relays to run the fan(s). Sorry for the block/head location mess-up in post #20. As stated in previous post, the gauge temp sender is in left block between plugs 1 & 3. .... Bob D.
