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Post by AmunRoo on Apr 15, 2015 8:10:19 GMT -6
Ok, Chicago weather is finally starting to warm up and stay consistent. It seems that my 3.5 fans aren't coming on at all. I've run the car and checked and they're still off. I highly doubt that I have the most efficient 3.5L motor ever produced. I do notice that is smells like really hot metal after a while which leads me to believe that I'm running hot, yet my temp gauge goes nowhere past the half way mark. Could this be a coolant temp sensor problem or fan relay problem? The car has 78K on the clock. I also have a sneaky suspicion that my catalytic converter may be on the brink of pushing up daisies as well... I tried doing a search and came up empty handed, hence the reason for this thread. Any and all help is greatly appreciated!
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tigger
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Post by tigger on Apr 15, 2015 13:50:31 GMT -6
Turn on the A/C and check, low speed should run with A/C on. If your A/C doesn't work, unplug the coolant reservoir level sensor. They should come on then as well. You may not have a problem at all, IIRC, they're not supposed to come on (low) until 220oF or so...
What's wrong with the cat? LOL!
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Post by AmunRoo on Apr 15, 2015 17:04:40 GMT -6
My fault, I forgot to mention that I run around with the A/C on so that the fans are running. I've driven around for over an hour and have done some spirited driving but they just wont work on their own. It gets hot to the point where you can start to hear the metal ticking...
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tigger
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Post by tigger on Apr 15, 2015 17:51:23 GMT -6
OK, gotcha. Be careful doing that, unless you're monitoring with a scantool.
Next, I'd check the fans themselves. Disconnect them and put 12V directly to the connector (or tap the line), ground to chassis. If they don't run, new fan time. If they do, start testing relays. I'll pull up the schematic tonight.
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Post by AmunRoo on Apr 15, 2015 17:56:02 GMT -6
thank you much...
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tigger
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Post by tigger on Apr 15, 2015 20:17:10 GMT -6
No problem. Cooling Fan Wiring  Fuse/Relay Locations (Engine Bay Fuse Block)  37 - Cooling Fan 2 Relay 39 - Cooling Fan Serial/Parallel Relay 40 - Cooling Fan 1 Relay 46 - Cooling Fan 2 Fuse 47 - Cooling Fan 1 Fuse Good Luck! |
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Post by AmunRoo on Apr 17, 2015 7:41:35 GMT -6
ok, so the fuses are intact. How do I know if a relay has gone bad? I tried switching around the identical relays, but didn't seem to see any differences. I don't want to spring the $40 for the relays if there isn't anything wrong with them. You can't return them! lol
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tigger
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Post by tigger on Apr 17, 2015 11:34:00 GMT -6
Haha! I completely understand. THIS EXAMPLE IS FOR EXPLANATORY PURPOSES ONLY This is a pretty common configuration but yours may differ. Most relays have a diagram printed on the side, or available on line.  1. Ohm between 30 and 87a. Value should be 0(zero) or very close. 2. Ohm between 30 and 87. Value should be infinite. 3. Supply 12V to 85 and ground to 86. You should hear the relay click. 4. With voltage still connected, repeat steps 1 and 2. Values should switch - 87a infinite resistance, 87 very little to no resistance. HTH |
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