Question
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The text above is a follow-up to ...
-----Question-----
I have a 1991 Lexus that was overheating. I changed the thermostat and flushed the radiator and replaced the rad cap. I finally realized the the fan was not turning on, so I pulled the cooling fan sensor. The car no longer overheats, but the fan stays on all the time. Is this OK? I don't want to go to the hassle of changing the sensor if it's not a vital part. The car's running so well now. Do I NEED a cooling fan sensor? Thanks
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Well... Aslong as the fan stays on, but that's not so great either for several reasons.
Follow Up
Thanks for the answer. What are the reasons that the fan going all the time is a bad thing? When I'm in city driving, my temp gets to a little over a third. On the highway, it goes down near the 'C.' Will I wear out the fan? Or is there another reason? Thanks.
AnswerThe engine can't warm up, which wears the metals & the oil breaks down faster among other things.
Also impacts economy as the engine is not warm & output suffers, it also injects more gas for longer as it is warming up. It wears the powersteering fluid & seals quicker because it's a hydraulic fan. The transmission fluid takes longer to come up to temp which wears your clutches because the fluid has the wrong coeefecient of friction.
It also takes afew extra horsepower to drive the fan.
You're most likely only talking about a few dollars in parts.
