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Post by dens95olds on May 9, 2017 21:30:48 GMT -6
Hey guys and gals! Its been ages, since I've posted, although I have had visited several times for the knowledge database. I've let my 95 go due to blown headgasket, which is above my comfort level. I did pick up a 2001 which has been trouble free until the last three months. I have a weird one that i cant find if anyone else has had the same issue. My Left cooling fan will run all the time even when i've turned the motor off and with motor dead cold. It's ran my battery completely dead, and when i hooked it up to a charger while in The vehicle, there goes the fan, energized. I'm about to check the coolant temp sensor, have checked the relays - all good, what else could run one fan with key off position. I'm not very good with electrical. Thanks in advance.
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tigger
Administrator 
Posts: 2,844 
Staff Member
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Post by tigger on May 9, 2017 23:41:10 GMT -6
Here's the wiring diagram for the cooling fans ('01). Only 2 ways I can see only the left fan running with everything else off; 1. FAN 2 RELAY is stuck, providing power at all times. 2. DK BLU wire between the PCM and the fuse block is shorting to ground, energizing FAN 2 RELAY, which again, provides power at all times. FWIW, you could just pull the fan 2 relay, you'd still have low speed fans...  GL, Let us know! |
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Post by dens95olds on Jan 23, 2018 18:54:00 GMT -6
Here's the wiring diagram for the cooling fans ('01). Only 2 ways I can see only the left fan running with everything else off; 1. FAN 2 RELAY is stuck, providing power at all times. 2. DK BLU wire between the PCM and the fuse block is shorting to ground, energizing FAN 2 RELAY, which again, provides power at all times. FWIW, you could just pull the fan 2 relay, you'd still have low speed fans... GL, Let us know! I’ve taken ur advise, and just pull the relay. Tried pulling the relay 2, but the fan kept running so i pulled the relay 1 and the fan turned off. Been running it without that relay, but now I actually want to fix it. Is it still the dark blue wire between the pcm and fuse box, or is there another color i should trace? |
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aphex
Aurora Watcher
Posts: 50
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Post by aphex on Jan 23, 2018 19:46:11 GMT -6
Have you tried a new 1st relay?
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tigger
Administrator
Posts: 2,844
Staff Member
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Post by tigger on Jan 24, 2018 0:24:08 GMT -6
Are you sure it's the left fan? What color are the 2 wires going to the fan that runs all the time? GRY/WHT = Right, BLU/BLK = Left.
Fan 1 relay wires the fans in series. Power comes from the energized relay, through the right fan, through the series/parallel relay, through the left fan, to ground. I can't see a scenario where Fan 1 relay could operate only the left fan.
There are scenarios for the right fan only though...
Fan 1 relay stuck or shorted to ground on DK GRN fuseblock to PCM wire.
AND ONE OF THE FOLLOWING;
S/P relay stuck or shorted to ground on DK BLU fuseblock to PCM wire.
Right Cooling Fan WHT connector to fuseblock wire shorted to ground.
I'd probably replace all of the relays first, knowing in the back of my mind that the wiring harness is fouled up somewhere, lol!
GL
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Post by dens95olds on Jun 21, 2018 13:15:46 GMT -6
Have you tried a new 1st relay? I’ve swapped the relays and same problem. |
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Post by dens95olds on Jun 21, 2018 13:20:33 GMT -6
Are you sure it's the left fan? What color are the 2 wires going to the fan that runs all the time? GRY/WHT = Right, BLU/BLK = Left. Driver side fan isthe onerunning and the wires are blu/black. GL |
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Post by sempar on Jun 26, 2018 14:39:47 GMT -6
I would suspect a short to ground in the low speed circuit, since you've already tried switching relays with no success. The short could be somewhere along the dark green wire to the PCM, or a short in the PCM driver. This driver provides a ground source for the relay, if it's internally shorted to ground, the fan will always run, regardless of temp or key position, since the fan 1 power source is hot at all times.
John
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Post by dens95olds on Jul 10, 2018 22:13:14 GMT -6
I would suspect a short to ground in the low speed circuit, since you've already tried switching relays with no success. The short could be somewhere along the dark green wire to the PCM, or a short in the PCM driver. This driver provides a ground source for the relay, if it's internally shorted to ground, the fan will always run, regardless of temp or key position, since the fan 1 power source is hot at all times. John Ok, fan 1 is the driver side? so if i run ground to pcm where 25 drk green wire connects, should tell me if the ground is in the pcm. If it show open, then it’s the wire between fan relay 1 to Pcm. Its also intermittent, can it be the pcm if its intermittent? Btw: i pulled on the wire harness that runs top of the engine that connects to some component with vacuum hoses midway and the relays went nuts like the short was being triggered. What is that component? Thats not a temp sensor that tells the pcm to provide ground to the fan relay does it? |
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Post by dens95olds on Jul 10, 2018 22:35:11 GMT -6
I'd probably replace all of the relays first, knowing in the back of my mind that the wiring harness is fouled up somewhere, lol! GL I was going to replace the relays, but just tested them yoday by running 12 volts on the coil contacts and ohms the other contacts. All three relays worked the way they are supposed to. I put a test light on the relay sockets 85 to ground and 86 to ground, both lit up, one stronger than the other. Its coming down to tracing that wire with the dimmer light from the fuse box. |
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