Auxiliary fan staying on
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Joined: Jun 2007
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Auxiliary fan staying on
Yesterday, I had the car running after replacing the harmonic balancer, timing cover, and adjusting the roller rockers. The car was fine until I noticed the engine side fan wasn't coming on and the temp went up to 248, at which point I shut the car off and called it a day since it started to rain. Today I go to start my car and the battery was dead so I had to jump it. As soon as I made connections to jump it, the front auxiliary fan came on, which I thought was weird. Started the car and the front fan turned off, and when the temp hit around 230 the engine side fan came on. Now when I turn the car off, the auxiliary fan stays on and turns off when the car is running. I waited 10 min before I just disconnected the front fan and tried to figure it out. Any suggestions? Where should I start? Could I have done something when I jumped it? Could I still drive the car with the engine side fan still working until I can figured out what's causing it? I'm guessing this is what drained the battery overnight, but the thing is, I don't remember hearing the fan come on after I shut the car off yesterday. It's a 85 L98. Thanks.
Last edited by IslandVette808; May 24, 2009 at 11:23 PM.
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Joined: Mar 2001
Posts: 54,124
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From: Cincinnati, Oh USA
Check the thermostatic switch that turns on the aux fan, then also check the aux fan relay, either or both may be defective. My money is on the thermostatic switch. I think on 85's, its on the left side of the engine. Check your FSM if you have one.
