Do Not Sell My Personal Information Jump to content


Recommended Posts

I'm a bit old skool my first car with a/c was a Ford Granda c1986 so have only really put the a/c unit on when I need the cooling. Reading a recent post on the GS450 page got me thinking about my RX400h should I leave the a/c switched on all the time and just set the temp required?, does this have a noticeable detriment to fuel consumption as it did in my Granada days?

thanks chaps

 

  • Like 1
Link to post
Share on other sites

I leave mine on all the time.  The difference in mpg is barely measurable and it ensures the system keeps fully lubricated and the seals don't dry out.

  • Like 3
Link to post
Share on other sites

I leave my a/c on permanently, summer it cools, winter it dries. 

In fact I have my climate controls all set to automatic, I just set the temp and let the car sort it out to the best effect.

  • Like 3
Link to post
Share on other sites

These cars don't just have A/C, they have climate control, the whole idea of which is as Peter says above, you set the temperature you want and the car maintains it for you. It is designed to be on continuously.

  • Like 1
Link to post
Share on other sites
1 hour ago, Djwbiker said:

does this have a noticeable detriment to fuel consumption as it did in my Granada days?

 

The AC system on the 400h is much more efficient. It is electrically operated via a motor, rather than mechanically driven by the engine, and the motor speed is electronically controlled so it only runs at a speed needed, not any faster.

I'd recommend using it during winter. It drys the air so you get less condensation and reduces any risk of mould etc. You can also use the recycle function without the inside becoming like a rain forest so you can keep diesel fumes out if you get stuck behind one.

 

If you don't want to use it then you should run it for 5 or 10 minutes every few weeks just to keep everything within the system lubricated correctly.

  • Like 2
Link to post
Share on other sites

1 hour ago, NemesisUK said:

I leave my a/c on permanently, summer it cools, winter it dries. 

In fact I have my climate controls all set to automatic, I just set the temp and let the car sort it out to the best effect.

I do the same.

Leaving climate controlling system on automatic all the time, keeps the system prepared all the time.

So yeah, i suggest you do the same

  • Like 1
Link to post
Share on other sites

Ac on. I actually find it most useful in the colder months to keep condensation at bay. 

  • Like 1
Link to post
Share on other sites

Not much more to add... AC should be kept on, not only to control your "climate", but as well to keep the system itself lubricated and seals from drying out. Not doing so could damage the system over time and as well cause bacterial growth in condenser etc. When that starts is stinks quite bad and quite difficult to clean it off - there are treatments but you may need to do it few times to fully kill it.

  • Like 1
Link to post
Share on other sites

Sound like a yes then...

Agree - good in Summer and good in Winter.

Link to post
Share on other sites
13 hours ago, ColinBarber said:

You can also use the recycle function without the inside becoming like a rain forest so you can keep diesel fumes out if you get stuck behind one.

Never quick enough with this! Usually behind some VAG soot monster, they set off, cloud of black smoke, I'm left choking and dithering for where the button is.

  • Like 1
Link to post
Share on other sites

Thank you all for the advice I will put a/c and have to eat humble pie with the misses as I've always moaned when she left the a/c on!!

many thanks

 

  • Like 1
Link to post
Share on other sites

Could I add a couple of points, replace the cabin filter at regular intervals and use an air conditioning aerosol cleaner yearly. These help keep the system efficient and bacteria free respectively.

  • Like 1
Link to post
Share on other sites
5 hours ago, rich1068 said:

Never quick enough with this! Usually behind some VAG soot monster, they set off, cloud of black smoke, I'm left choking and dithering for where the button is.

The saddest thing is when you think you are behind Lexus and then black smoke puffs out and you realise it was IS220d 😪

But mane is always on AC + re-circulation, because otherwise car becomes like a gas chamber.  

Link to post
Share on other sites

I leave the recirc on auto and the pollution sensor switches modes as required. Plus in summer it switches automatically to recirc to speed up cooling the cabin and in winter to warm the cabin, switching back to fresh air when heating/cooling has achieved the desired cabin temps.

Damned clever this Lexus climate control.. Neural network controlled -

"This control is capable of performing complex control by artificially simulating the information processing method of the nervous system of living organisms in order to establish a complex input/output relationship similar to that of a human brain. " 🤓

  • Like 2
Link to post
Share on other sites

^^^^^^^^This.

I've never understood people who buy cars with stuff like this in and then think they know better than the computers. Just let it do it's thing that it was designed to do and you get the best out of it.

  • Like 1
Link to post
Share on other sites

Is the AC system a single or dual coil system?

https://www.quora.com/What-happens-if-you-run-the-heater-and-AC-in-your-car-at-the-same-time

I switch on AC with heating and recirc a lot of the time (in an effort to dry her out). 
 

I assume that moist warm air is passed through the condenser before warmed and returned in the recycle. 

Link to post
Share on other sites
2 hours ago, NemesisUK said:

I leave the recirc on auto and the pollution sensor switches modes as required

400h doesn't have auto recirculation function 😞 

Link to post
Share on other sites
1 hour ago, Greisingel said:

Is the AC system a single or dual coil system?

Dual of course 😉  Fresh/Recirc air > blower > Evaporator > Heater

1721369500_Screenshot2021-02-08at19_16_21.thumb.png.8062f233b32572c06d06ee04cb9f6467.png

99588993_Screenshot2021-02-08at19_17_15.thumb.png.2740f9c1b7adfd772075427e3e560d53.png

  • Like 1
  • Thanks 1
Link to post
Share on other sites
12 minutes ago, ColinBarber said:

Dual of course 😉  Fresh/Recirc air > blower > Evaporator > Heater

1721369500_Screenshot2021-02-08at19_16_21.thumb.png.8062f233b32572c06d06ee04cb9f6467.png

99588993_Screenshot2021-02-08at19_17_15.thumb.png.2740f9c1b7adfd772075427e3e560d53.png

Thanks for confirming in detail. Thought as much. And yes manual recirc. 

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...




Forums


News


Membership