Lexus SC300 Problems

Heating and AC Control May Fail Intermintently on Lexus SC300

Problem Description and Possible Solution

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.

(38 people reported this problem)

Lexus SC300 Vehicles With This Problem

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Average mileage: 163,126 (94,000–230,000)
9 model years affected: 1992, 1993, 1994, 1995, more1996, 1997, 1998, 1999, 2000
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Viewing 1-16 of 16 comments
Same issue, my display is blank for both heat and a/c and nothing is responding. I replaced the display and it is still the same problem. I finally decided to go to the local Lexus dealership and ask. I didn't much help but he recommended looking at the fan relay. I will update progress.
The air blows no heat or cold air come just outside air all the controls on the pannel work just not hot or cold?? help
When I turn on my A/C the light just flashes and blows warm (whatever temp it is outside, I live in Arizona so usually hot) air. My A/C was working fine as I was cruising down the highway and it suddenly gave out and started blinking and blowing "non A/C" air. Although I have to admit, it started a few hours after using a "tape" in the tape deck to play my iPod. I don't know if it's electrical or what. But I do know that the half the display screen is slightly dimmer. Any help would be much appreciated.
After owning the car for a week the problem started. The heater display goes blank, all functions with the heater/AC will stop. It will then come on again and work perfectly. This seemingly happens at random. Now the same thing is starting to happen with the stereo system.
I had the same problem there is a fuse under the steering wheel on the left we replaced a fuse (10A red) and the display began to respond again
AC will go on ok - once outside temp reaches 70 degrees AC does not stay cold - blows only hot air. There is no freon leak and putting in additional freon resolved nothing. Compressor is working fine - blower is working fine. Heat works fine. Had one tech look at it and he thinks it may be the temp control board in the front panel unit but I have not had it replaced yet. Still checking.
ac compresso.r comes on for a couple seconds then goes off , ac light flashes ,you could turn off then on and it would cool now that does not work gas pressure is good
Heater AC Control LCD display faded out. Replaced Control at junk yard w/SC400 control.
I had only a black screen on my ac unit. I contacted (mercuryrunner)at his eBay store and for $40.00 with site instruction on how to install them I fixed my as problem. This is the cheapest way to fix this with out going to a dealership. I hope that this is helpful to anyone with this issue.
Had to turn on heater for a few days. Now, the ac won't get cold. Freon and everything is working perfect. Just heat comes out of the ac instead of cold air.