Switch off air con before engine?

[3star]

Do you switch off the air con first before switching off the engine?

Any harm if you don't?

[arkaneslayer]

don't think so.

[Steptronic]

No need

[BabyA]

No harm.

That said, I did read somewhere it helps when starting up the engine i.e. less battery power required.

I do it habitually (audio inclusive) decades ago.

[solar]

No harm.

That said, I did read somewhere it helps when starting up the engine i.e. less battery power retquired.

I do it habitually (audio inclusive) decades ago.

 

imo, not really. when u turn the key towards the crank, u may have noticed the fan and electricals actually go off... that means it's built-in that power towards them will be off prior to the crank.

as for turning off the a/c before shutting off the engine, one possible benefit i can think of is perhaps to 'dry' up condensation on the a/c pipes before u turn everything off?

but well, it may need more time to dry up.. so.. dunno already.. maybe someone can advice?

[Odessus]

Only thing I switch off before engine is my radio as I don't like the radio to scare me when I power up my car. Other than that, no change.

[mountaingoat_gray]

Look at it this way - newer cars with eco start stop crank and switch off engine so many times with the aircon on. It's designed to do this safely. Ever noticed the lag between cranking up and aircon air blowing? Seems like they have thought of the problem and already inserted a delay. 

[benedictgoh]

Look at it this way - newer cars with eco start stop crank and switch off engine so many times with the aircon on. It's designed to do this safely. Ever noticed the lag between cranking up and aircon air blowing? Seems like they have thought of the problem and already inserted a delay. 

hi mountain, just curious, does the eco start stop damage the engine? i always turn it off when i drive 

[3star]

Thanks for all replies. That's a good follow up question - Eco start stop. In Japan, their public buses have similar start/stop, possibly manual. I hope no damage too.

[mountaingoat_gray]

hi mountain, just curious, does the eco start stop damage the engine? i always turn it off when i drive 

I'm quite sure they tested it for a while so it should be fine- it's not new technology after all!

[benedictgoh]

I'm quite sure they tested it for a while so it should be fine- it's not new technology after all 

thanks, I usually turn it off because I don't like the movement of the car when it starts and possible damage to the car. The SA told me she turns it off also, because the aircon will be lower in fan speed when the engine is off. 

[BabyA]

thanks, I usually turn it off because I don't like the movement of the car when it starts and possible damage to the car. The SA told me she turns it off also, because the aircon will be lower in fan speed when the engine is off.

From what i read somewhere... it goes into fan mode and not in aircon mode, aircon comes back on when the engine "awakes" to move. How true or which is true, didn't bother to research since i also turn it off.

[3star]

thanks, I usually turn it off because I don't like the movement of the car when it starts and possible damage to the car. The SA told me she turns it off also, because the aircon will be lower in fan speed when the engine is off.

That is so true, I hate the movement too. My mom said what's wrong with your car?!

[benedictgoh]

That is so true, I hate the movement too. My mom said what's wrong with your car?!

hahaha, i said it to my uncle when i was saying in his W204, but i must say the W205 doesn't have so much movement, but i still don't like hahaha