Heating and AC Control May Fail Intermintently on Lexus SC400

There are reports of intermittent failures with the heating and air conditioning control. The digital display might fail or the control might fail to switch between heater functions.

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Average mileage: 159,227 (107,000–203,000)
9 model years affected: 1992, 1993, 1994, 1995, more1996, 1997, 1998, 1999, 2000
29 people reported this problem
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Viewing 1 - 14 of 14 problem details
My ac/heat won't turn on. I thought a fuse might be blown b/c the whole display is out....not sure how to fix it.
1992 Lexus SC400 203,000 mi,
no heat blowing cold air
Sudden inability to use heat or air conditioning. Display panel does not toggle to exterior temperature. Thought it was a fuse, but this does not appear to be the problem. I have no answers.
1998 Lexus SC400 155,688 mi,
My A/C and heater panel went out. Controls for defrosters and Temperatures are all not working. Tried checking_replaced fuse - still not working.
the heat does not work it might come on 2 times the hold winter .what needs 2 be done bout this,do i need a new unit
1993 Lexus SC400 191,000 mi,
ac works but heat does not blow out I have heat but am unable to feel it.
1992 Lexus SC400 175,526 mi,
i had the same problem, i got a can of that electrical parts cleaner, for wires and stuff. i cleaned every fuse and the fuse box under the hood. i could not figure out which one may be for the ac so i cleaned them all. i let the car sit a little while so the cleaner fumes could go away then started it up and turned on the ac. works fine now.
Blow nothing but cold air. temp.guage in car shows heating up, replaced themostat, filled up radiator. let run ,air still ice cold
1992 Lexus SC400 197,000 mi,
Sensor does not release hot water to the cabin heater.
1992 Lexus SC400 178,000 mi,
no heat, A/C work
1997 Lexus SC400 130,000 mi,
same as listed
1995 Lexus SC400 124,678 mi,
i have the same thing g in on with my car sc 400,will it need to be replaced.
Air conditioning and heat have ceased operating
1997 Lexus SC400 150,000 mi,
a/c works but the heater may come on only at around 60mph. Otherwise it doesn't work. The temp gauge has risen slightly from dead center.