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.

RepairPal Verified
Average mileage: 156,987 (107,000–203,000)
9 model years affected: 1992, 1993, 1994, 1995, more1996, 1997, 1998, 1999, 2000
31 people reported this problem
16 people shared 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 SC400203,000
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.
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
1998 Lexus SC400155,688
My A/C and heater panel went out. Controls for defrosters and Temperatures are all not working. Tried checking_replaced fuse - still not working.
1993 Lexus SC400191,000
ac works but heat does not blow out I have heat but am unable to feel it.
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 SC400175,526
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.
1992 Lexus SC400197,000
Sensor does not release hot water to the cabin heater.
1997 Lexus SC400130,000
same as listed
1992 Lexus SC400178,000
no heat, A/C work
Defrost is blowing but doors vents have no air blowing and windsheild still fogs up on passage side it's a little better on drivers side, heat works find.
1997 Lexus SC400116,672
Actually just purchased this sc400, it is in great condition. AC has been working fine but start has been rough. Stopped by Advance Auto and they did a check on the battery and electrical system turns out the alternator is going bad. But, later this evening I noticed the AC not working as I'm driving so when I get put the car in park the AC starts working but stops when the button on gear shift is depressed.
1995 Lexus SC400124,678
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 SC400150,000
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.
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