RLM

This is annoying and all my riders complain about the A/C Auto mode on this car.

Here is the issue in Auto Mode with the inside temp set at 72 degrees, and the outside temp is cold anywhere from 55 to 65 degrees the A/C always blows cold air into the car. I can never get heat to flow into the car. The manual says that auto controls the a/c flow, fan speed, and vents like auto in almost every car. What is wrong here? The A/C is always on blowing cold air regardless of the temperature set inside the car. To me it seems that the temperature setting for both passenger and driver do not work.

I traded my X5 in for this Lexus. I am not sure it was a smart thing. Lot's of little quirky things about this Lexus.

Comments?

ericsan13

I would guess that the ICE is not used often enough to sufficiently heat up the heating radiator. Therefore you don't feel any heat.

Especially if you have the tow package with the heavy duty radiator?

RLM

Thanks for responding. I do not have any tow package. What is the ICE you refer to? Could you explain your post to me. Thanks

BertL

ICE = Internal Combustion Engine, aka the gas engine opposed to the electric motor(s) that are part of your hybrid. It's one of those acronyms you'll get used to here with the hybrid gang.

kitlz

Welcome to CL, RLM. A/C on all the time is the default setting. You can go in and change it but then you'll have to manually turn it back on. Raising the temperature is the best thing to do. Fan speed should increase as the engine warms up which does take longer. But there shouldn't be cold air blowing out of them. The other thing is the temperature also dictates which vents the air comes out of in auto mode - floor and windshield above around 75 and the center and windows lower than that IIRC. Finally there is the dual mode so your passenger can adjust their own temperature manually.

I fixed your little typo on the model number too

vlad_a

It would be nice if there was an AC button. But you have to go through the menus of the factory frustration (Navigation) system. There's a setting to enable auto-AC on. It doesn't do much.
Here's my vent thread (pun intended):
https://www.clublexus.com/forums/rx-...not-to-ac.html

Droid13

While I can't find anything specific in the RX manual about how the auto mode operates, to me it seems to have the same standard auto mode logic that I've seen in other Toyotas, in which it tries to make intelligent choices about how you feel, not blindly follow your temp settings. The auto mode in my Camry Hybrid was described to work as follows...

When you set the temp to 72F, the system will compensate for daylight and ambient temperature. At 60F outside, if it's a bright sunny day it can feel quite warm shining on you through the glass. The system will actually deliver cool air. At night under the same circumstances, the system will deliver warmer air as it knows you will not feel any warm from sunshine.

It doesn't always make the best choices so adjusting the temp is sometimes necessary to override. For example, the other day it was 29C outside (85F) on a bright sunny day. I turned the A/C into auto mode, but I had to turn the temp setting to 28C (83F) just to avoid a severe case of frostbite. Damn, winters in Canada are long enough, I don't need one inside my RX in July! I believe with less sunshine the system isn't so aggressive.

UCSB

I've never had any temp problems in my 450h. The climate control system is very unobtrusive and seems to respond quickly to my minor temp changes. I can not remember one time where I felt there was cold air blowing on me. The system does run slightly differently in ECO vs non-ECO mode.

satnav

Coming also from a European car (05 Audi A6) I would agree the Lexus climate system in their entry level cars is not advanced (quirky). The fan doesn't adjust and seems to get stuck blowing a full speed even when the temp inside has lowered. It also does not adjust for direct sunlight. Also I have no idea why sometimes for heat it only blows at the feet and for cold air its blows at the head. I wish it would blow on feet and head at the same time in auto mode. I think the RX system is primitive simple temp sensor to control the fan and air temp output. I know on my A6 it has sensors that detected the suns directions, infrared thermometer, could auto recirculate adapting to smog, detect and adjust for humidity (only pushed defog once or twice a year), and most importantly it actually would bring the cars interior to the set temp and reduce the fan speed. But lets not forget the X5 and A6 are mid level cars. The RX is entry level so some areas are not as tech driven.

vlad_a

A quick way to fix the air-too-cold problem is to hit the recirculation button. It goes automatically into the recirculation mode virtually each time it turns on the AC. It's a very smart feature.

hank1414

I'm in Canada most days this winter has been -30 degrees F, I have a Lexus RX450h and have to turn off the ECO MODE off to get some heat. Thinking of going back to the RX 350.

vlad_a

ECO mode has no business being on in -30F temps.
Keep in mind, this has been a record- setting winter. By the time you trade in, we may be back to mild winters.
Try the sport mode. I did that last time we got a blast from the north.

Maertens

Same here (2010 RX350 Ultra Premium). My solution when it is blowing cold air at 72, is to turn the central area vent wheels down so that it is not blowing onto my hand and the passengers. What actually happens, it automatically redirects air into the vents near the windshield so it does not bother. Need premium ideas for premium cars.