biacs

So this is a fun issue because its intermittent. I have had a few times so I'm trying to pin down details. Car has been sitting in the sun for most of a day say 85-90 degrees. When I start the car the AC air blows coolish but it basically seems like the condenser is not engaging. When I arrive somewhere and then restart the car later, the AC is ice cold. I also did have the refrigerant and pressure switch (replaced) serviced earlier int he summer.

Things I try:
-recycle AC
-switch recirc vs fresh air
-turn temp down to COLD

Any known issues like the compressor clutch switch or what else have folks had to address?

Johnhav430

I thought someone just said (because I had asked if folks turn off AC prior to shutting off), that the AC doesn't engage immediately upon restart....meaning if the AC was left on, when restarting, the car will decide when to engage the compressor...I do get the distinct feeling that it is NOT cold upon restart, and at some point, it starts blowing cold....

here it is

https://www.clublexus.com/forums/ls-...ml#post9900901

jayclapp

In the LS430 I think the compressor comes on instantly when set on auto, but it won't blow air unilt after a brief time (depending on the interior temperature) to prevent blowing hot (or cold) air onto the driver and passengers. A very sophisticated system to pamper the owner.

biacs

So when I had this issue on a recent hot day. I hopped in the car and drove an hour to a baseball game. It never 'kicked in' and started blowing that cold air you get from the compressor running.


What I will do next time, is sit in the car for a minute. If the air dosent get cooler, I will turn the car OFF and restart it. Curious to see if that helps the issue. It really seems like this is a sensor/electronics- type issue.

biacs

it happened again - hot day, AC on auto blew HOT air at full blast. I restarted the car a few times within starting to drive a few minutes. It really seems like the car has to 'cool off' before the compressor decides to kick in.

Some interior temp sensor as a known issue??

jimisbell

Next time it happens, get an ice cube and hold it on the pressure switch until it is melted and the switch is cooled. I had this happen on a NEW pressure switch in a Honda that was bad in the box. You can also push a pin thru the two leads that need to be shorted to see if it fixes the problem. For a week, until I could get another switch, I carried a cup of ice cubes to the car andplaced one on the switch before starting the car. Worked fine.