JMan23

2001 Lexus GS430. Battery is about 3 months old. I'm positive the alternator is still good though I will check those down the line.

I have a parasitic battery drain that I think is coming from my fan. This morning the car was dead and I had no idea why, I got a jump and went to work. About 25-30 minutes later a coworker came and told me my fan was still running, the left fan to be exact. He gave me a jump because the car wouldn't turn over. I kept the ground disconnected so I was able to get home.

i get home and leave the battery connected to see what would happen. I go outside about 1 hour later and again the battery is pretty much dead. One thing I noticed was that the left fan was running once I had attempted to turn the car on.

Any way I can go about this? I've read about Relays and Switches but not having a diagram I don't know where these things are located.

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​​​​​​Thanks for the help!

jjmurph01

Interesting. Have a 2007 SC that does dead like this and looking for similar symptoms. Will check out this type of issue. Thanks.

sbagdon

Either the input to the relay is bad, or the relay is bad... any engine codes?

engin_ear

iTrader: (1)

Most likely the relay itself.

JMan23

Where is the Relay located and what's the best way to tell it's bad?

JMan23

So I just checked my coolant level and it's pretty low. Could that cause the fan to run constantly?

JMan23

Took it to my mechanic, he couldn't find anything. The fan never turned on either

Car fired right up this morning.

I don't know what to do from here.

JMan23

So I woke up this morning and the battery was dead again. Left fan was running when I popped the hood. Also the coolant was low again after the mechanic had filled it

I heard some fuses clicking. Wonder if it could be that?

sbagdon

Fuses don't click, relays do... which takes us back to the original statement...

Either the input to the relay is bad, or the relay is bad...

This reminds me of the late-'80s Dodge Neons... the relay would go bad, and run the fan until the battery died. It was so bad, people either trained themselves to unplug the fan after getting out of the car (and plug back in, to get working a/c), or (no kidding) would put a on/off switch in the grille, so they could flip the switch when they got out (some put it under the dash/columnn, so they could flip it when they got out of the car).

JMan23

Took it up to another shop today. Guy found out it was the fan motor. It's was drawing too much power and burning out the relays.