MartyW Posted June 24, 2013 Share Posted June 24, 2013 My 1999 ES-300 has had an intermittent radiator fan stoppage for three years. Mechanics can't find the problem, because it's so intermittent. The symptoms are: temperature gauge starts to rise quickly, I stop, get out, open the hood and find the fan is not running. I tap on the relay box a couple of times and the fan starts. Then I am OK for anywhere from two weeks to six months. The most expensive relay has been replaced, to no avail. My question is this: Are the relays meant to start the fan only when it is required because of temperature? If so, is there a way to wire them so the fan runs all the time? Living in Arizona, I don't think the engine is going to get too cool. Any other ideas or similar problems? Thanks Marty Quote Link to comment Share on other sites More sharing options...
cwfly Posted August 31, 2013 Share Posted August 31, 2013 I'm having the exact problem with my 1999 ES-300. If I tap on the fuse box or wiggle the relay, the fans start working for up to 2 weeks at a time. The dealer didn't have one in stock so I purchased one from O'Reilly Auto Parts. It lasted about 15 minutes before it completely died. Marty,(or anyone), Did you ever solve your problem? Quote Link to comment Share on other sites More sharing options...
MartyW Posted August 24, 2014 Author Share Posted August 24, 2014 Nope--still have the problem. My radiator blew out one time, when I didn't catch it soon enough. I would take it in to my Lexus dealer, but they would want to replace the engine! Quote Link to comment Share on other sites More sharing options...
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