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Andrew

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  • Lexus Model
    1991 LS400

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  1. I have a 1991 LS400. According to the shop manual, there are three relays for the (2) fans on the condensor...Relay 1, 2, and 3. One fan is for temperatures above 192 degree and the other fan is for the A/C system. It's a two speed fan: low for below 192 degrees and high for above. When the A/C system is on there should always be a fan on otherwise the high side of the system will not cool off. If the fans aren't working you may a couple of problems. One is the coolant sensor (electrical connection)...unplug it and one fan should come on. Two, one of your relays could be bad. Or three, a fan could be faulty. I've verified through electronics schematics at the back of the manual. Good luck guys.
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