AC issues

Reply Subscribe

Thread Tools

Search this Thread

Jul 14, 2022 | 08:42 AM

DAVEB1980

Thread Starter

Advanced

Joined: Aug 2016

Posts: 595

Likes: 104

From: TX

AC issues

My AC runs warm upon start up (not all the time) and after I shut the car off and restart the AC blows cold as ice. I had the ac tested and no leeks either. Any ideas? Its also 103 here is Houston Texas nd maybe that plays a part.

Jul 14, 2022 | 10:36 AM

Harold57

Lead Lap

Joined: Aug 2006

Posts: 4,759

Likes: 416

From: Texas

Maybe a sticking relay?

Jul 14, 2022 | 11:08 AM

DAVEB1980

Thread Starter

Advanced

Joined: Aug 2016

Posts: 595

Likes: 104

From: TX

Hmm didn't think of that, it could be dirty and sticking.

Jul 24, 2022 | 04:04 AM

heymomx2

9th Gear

Joined: Apr 2017

Posts: 9

Likes: 2

From: New York

did you check a/c pressure with gauges

Jul 25, 2022 | 07:16 AM

Raven01750

Racer

Joined: Aug 2019

Posts: 1,757

Likes: 355

From: CA

Quote:

Originally Posted by DAVEB1980

At 103, your entire system is being taxed. It "could" be the compressor clutch failing. But it being intermittent will need some more checks. I would hate to just start throwing parts at it. Check YouTube. They almost always have something relevant. Do the A/C test routine. How to do that check has recently been discussed and should be searchable. Keep us informed. The moderators read everything and pipe in with valuable info when they get a moment. Thank you everyone.😁

Paul

Jul 25, 2022 | 07:50 AM

DAVEB1980

Thread Starter

Advanced

Joined: Aug 2016

Posts: 595

Likes: 104

From: TX

I have noticed that if the car is warmed up on days I dont plan of using it the problem goes away. Its only when it sits idle for a a few days ...its as if something is sticking.

Jul 26, 2022 | 02:46 PM

Wilson2000

Pole Position

Joined: Jan 2020

Posts: 2,738

Likes: 544

From: CA

There are two valves in the system that could be sticking: the compressor control valve, and the expansion valve.

10 Lexus Designs That Have Aged Like Fine Wine

Verdad Gallardo

8 Tips for Improving Your Hybrid or Plug-in Hybrid's Efficiency!

Michael S. Palmer

10 Best Lexus Models No One Remembers

Joe Kucinski

TRD Off-Road Premium: Best 2026 4Runner, Except This One Thing

Michael S. Palmer

Top 10 Lexus & Toyotas to Drive Before You Die!

Joe Kucinski

Top 10 Lexus/Toyotas With The LEAST 5-Year Depreciation

Joe Kucinski

Lexus LC500 Convertible Auction: A Preview of Rising Values?

Brett Foote

GX 550 vs TX 550: Best 3-Row Luxury Lexus Family Hauler

Michael S. Palmer

9 Best Lexus Models You Can Buy for Half Price (And 1 You Shouldn't!)

Joe Kucinski

2026 Lexus NX Buyer's Guide: Models, Features, Prices & More!

Brett Foote

Jul 27, 2022 | 10:18 AM

DshngDaryl

Pole Position

Joined: May 2016

Posts: 3,082

Likes: 653

From: AZ

If it is the expansion valve, you will most likely have to get behind the dash. The compressor valve would be easier to fix (in my opinion)

Jul 27, 2022 | 10:34 AM

#10

Margate330

Lexus Champion

Joined: Apr 2019

Posts: 11,197

Likes: 1,582

From: FL

^^ +1 From my experience, not running the AC on a regular basis will cause the expansion valve to get sticky.

I make sure I run my AC at least for a few minutes a couple times a week now whether needed or not and it has been improving.
If it's not too far gone it can come back sometimes as I was running 50 degree vent temps and my temps have been running 40 degrees lately.

Eventually I will drop the blower assembly(RX330) and replace mine since it won't last forever and probably drop in an new condenser while I'm at it.

Jul 28, 2022 | 04:40 AM

#11

DAVEB1980

Thread Starter

Advanced

Joined: Aug 2016

Posts: 595

Likes: 104

From: TX

I took the car to a mechanic after work and he found a small leak which got fixed add a new value too. The AC now runs super cold and it still went warm after siting idle. The mechanic put the car on the computer and it blew 2 codes( he didn't tell me what they were). He thinks it may be the car computer telling the ac not to switch on. He went on to say the condenser is new and was replaced at some time. He thinks it may be a wiring issue. I'm dropping the car off again on Friday so he can check out the wiring.