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Old 18-05-2018   #1
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AC air intake location

I need to spray some disinfectant into the AC air passages, so I'm looking for the intake location. Where should I spray the stuff exactly? Just in the vicinity of these plastic grills? Please advise.
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Old 19-05-2018   #2
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Re: AC air intake location

I've disinfected the a/c system on a couple of cars in the past, and each time have used a product that has come in a "one shot" aerosol. You start the car, turn the a/c on and set the system to recirculate. You stand the aerosol can in one of the footwells and trigger it, which will cause it to spray until the contents are exhausted. As soon as it's triggered, you shut the car door and leave the engine and a/c running for about 10 minutes. Finally, open a door and set the system to draw air from the outside for a couple of minutes to flush it clear.
I've found this works pretty well, but the best way of keeping the a/c odour free is to never switch it off. This policy is also good for the seals in the system as it keeps them lubricated.
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Old 19-05-2018   #3
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Re: AC air intake location

Something like this is what I used:
https://www.bilthamber.com/air-con-bomb-citrus
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Old 19-05-2018   #4
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Re: AC air intake location

Quote Originally Posted by TrevC View Post
I've found this works pretty well, but the best way of keeping the a/c odour free is to never switch it off.
I never bothered with climate control settings, always kept it on auto. I'll switch the AC on and see if it helps. Thanks!
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Old 19-05-2018   #5
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Re: AC air intake location

Nothing wrong with leaving it on Auto, it seems to work well, just make sure a/c is on, too. If there's a bad smell, using a bactericide as described above should get rid of it.
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Old 20-05-2018   #6
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Re: AC air intake location

Quote Originally Posted by TrevC View Post
Nothing wrong with leaving it on Auto, it seems to work well, just make sure a/c is on, too.
That's the thing, turning the AC on switches the auto mode off and activates the manual controls. They seem to be mutually exclusive.
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Old 20-05-2018   #7
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Re: AC air intake location

As a side note, there is no persistent odor in my case. It's just when I turn the car on after an 8-hour parking under direct sun I get this unpleasant smell for a couple of minutes, until the system ventilates itself. Everything is fine after night parking (or any sunless parking for that matter), no smells, nothing.

I bought this AC cleaner this morning in a local auto store. Will try today and see how it goes.
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Old 20-05-2018   #8
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Re: AC air intake location

Yes, I had that brief smell with my 500 but never got around to doing anything.
Your car is a US model, which may behave differently. If I switch off the ac on mine, the Auto light goes off. If I push the Auto button, it goes back to Auto mode and ac comes back on again! Strange.
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Old 20-05-2018   #9
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Re: AC air intake location

Quote Originally Posted by TrevC View Post
Yes, I had that brief smell with my 500 but never got around to doing anything.
Your car is a US model, which may behave differently. If I switch off the ac on mine, the Auto light goes off. If I push the Auto button, it goes back to Auto mode and ac comes back on again! Strange.


It depends on what temp you have set ,my air con works on auto at all temps. If temp is quite high on auto the ac will switch off when auto is pressed.
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Old 20-05-2018   #10
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Re: AC air intake location

Quote Originally Posted by twobigdogs View Post
It depends on what temp you have set ,my air con works on auto at all temps. If temp is quite high on auto the ac will switch off when auto is pressed.
In my case temps don't matter, AC always turns auto off.
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Old 21-05-2018   #11
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Re: AC air intake location

Quote Originally Posted by Goodcoin View Post
In my case temps don't matter, AC always turns auto off.


So your AC only works on manual mode?
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Old 21-05-2018   #12
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Re: AC air intake location

Seems to be a bit of confuaion over AC/ Auto.

AC is just like a cold fan, and the more you dial up the speed the colder it gets quicker.

Auto (sometimes called climate control) uses AC to modulate the temperature to the number set on the temp dials. So say the ambient temperature is 24, you set to 20, the AC kicks in (although the auto light is on) and lowers the temperature to 20, then it keeps the temp at 20 until you turn auto off. A good thing in hot weather about having auto constantly on is the car never gets too hot and the fan will only spin at low speed qhich is quieter.... and less draughty.
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Old 21-05-2018   #13
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Re: AC air intake location

Yes, when I referred to having ac on, I was referring to the ac lamp on the left hand knob being on. This indicates that the compressor is active. If you turn this off using the associated button, the temperature in the car will never be less than ambient.

There is also a button on the centre knob which turns the whole system off.
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Old 22-05-2018   #14
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Re: AC air intake location

Quote Originally Posted by twobigdogs View Post
So your AC only works on manual mode?
In my understanding, in auto mode the AC is managed by climate control and in manual mode it's just forced to be always on.
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Old 22-05-2018   #15
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Re: AC air intake location

So, basically, when I switch the AC on, it annuls the auto mode to give me the full control. Otherwise, the system decides whether the AC should be working or not, based on the set temperature. The fact that the AC light is always off in the auto mode doesn't necessarily mean it's not working.
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