Cooling fans 2003 LS430
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Driver School Candidate
Joined: Dec 2018
Posts: 5
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From: TX
Cooling fans 2003 LS430
Hello,
This is my first post on this or any forum for that matter. I’m hoping someone can help me with my problem. The battery light came on showing a problem with a no charge condition. After checking with my meter I replaced the alternator. That turned the battery light out and was getting 14 volts charging. Shortly after that I noticed that when the key is out of the ignition the coolant fans run continuously, even when the engine is cold. After trying to follow the schematic I hit a dead end and made a guess at the cooling fan module. That was a expensive guess and needless to say didn’t fix it. It looks like there is a 7.5 amp fuse that powers the coil side of the relay but I don’t know where it is located. It looks like after that energizes the relay a 50 amp fuse comes into play and sends current along a white/blue tracer wire to the cooling fan module that in turn sends current to the cooling fans via two separate connectors. Correct me if I’m wrong but I don’t think I’m supposed to have 12 volts at the cooling fan module with the key off with a cold engine. I’m confused at this point and would appreciate some clarification on the schematic. Thank you.
This is my first post on this or any forum for that matter. I’m hoping someone can help me with my problem. The battery light came on showing a problem with a no charge condition. After checking with my meter I replaced the alternator. That turned the battery light out and was getting 14 volts charging. Shortly after that I noticed that when the key is out of the ignition the coolant fans run continuously, even when the engine is cold. After trying to follow the schematic I hit a dead end and made a guess at the cooling fan module. That was a expensive guess and needless to say didn’t fix it. It looks like there is a 7.5 amp fuse that powers the coil side of the relay but I don’t know where it is located. It looks like after that energizes the relay a 50 amp fuse comes into play and sends current along a white/blue tracer wire to the cooling fan module that in turn sends current to the cooling fans via two separate connectors. Correct me if I’m wrong but I don’t think I’m supposed to have 12 volts at the cooling fan module with the key off with a cold engine. I’m confused at this point and would appreciate some clarification on the schematic. Thank you.
Thread Starter
Driver School Candidate
Joined: Dec 2018
Posts: 5
Likes: 0
From: TX
#3b says check that there is continuity between terminal 3 & 5. It should say check that there is NO CONTINUITY. If there IS CONTINUITY replace the relay. There is a contradiction from the diagram vs the verbabge in the paragraph. I do appreciate the information. My ohm test does play out the way the diagram shows. Looks like the relay is good. Although I haven’t performed the test with battery voltage applied. I’ll let you know. ��
Last edited by Ron7657; Dec 14, 2018 at 05:38 AM.
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