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Windshield blower always using AC


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30 replies to this topic

#21 OFFLINE   kc1174

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Posted 01 February 2015 - 05:04 PM

Remind me to stick a label over those buttons with "no" written on it, like in Apollo 13.

So bottom line is - Ford or someone assumed defrost/defog needs the compressor to run to dehumidify the cabin. Regardless of whether humidity was the cause. Could just be the cabin air dew point vs the windshield temp, but anyway, it's moisture of some kind, so we need to dehumidify the cabin with the compressor when a quick blast of warm air would do the trick in that situation.

What gets me is why it specifically says the AC is off on the control and in MFT when it's not. I get the need to force the use of AC occasionally to keep it in good working order, especially during winter months. Having defrost say AC is on and allow us to turn it off would get the same result. It would run for a bit until we choose to turn it off.

Next time I'm in the shop, I'll report it as a bug and see if I can get some manual override out of them. Might get lucky where some combination of button presses gives us the option to have the AC button do what it says instead of looking at the climate usage to see what it's doing.







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#22 OFFLINE   fotomoto

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Posted 02 February 2015 - 12:15 AM

KC, why is this such an important issue to you?  



#23 OFFLINE   kc1174

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Posted 02 February 2015 - 01:26 AM

KC, why is this such an important issue to you?


It's not really that important in the general scheme of things.

Started out as a question as to whether my car had an issue since the AC ran when the climate control said it was off on the windshield vent setting. Not a big deal, but I'd like to be able to control whether AC is used, if it's possible. I'll ask them when I eventually go in for the recall I've been avoiding.

#24 OFFLINE   drdiesel1

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Posted 02 February 2015 - 01:37 AM

It's not really that important in the general scheme of things.

Started out as a question as to whether my car had an issue since the AC ran when the climate control said it was off on the windshield vent setting. Not a big deal, but I'd like to be able to control whether AC is used, if it's possible. I'll ask them when I eventually go in for the recall I've been avoiding.

 

Read the page I posted from the owners manual. It's not abnormal operation.



#25 OFFLINE   Bugblndr

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Posted 02 February 2015 - 12:07 PM

GM cars have operated like this for many years.  When defrost is on, A/C is on.  I thought most/all cars did the same.  



#26 OFFLINE   drdiesel1

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Posted 02 February 2015 - 01:42 PM

GM cars have operated like this for many years.  When defrost is on, A/C is on.  I thought most/all cars did the same.  

They do.



#27 OFFLINE   Redshift

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Posted 06 September 2015 - 05:12 PM

Every car I have ever owned turns on the a/c when you select defrost. Since it is so much faster doing it that way, my guess is that it's a safety requirement.



#28 OFFLINE   jestevens

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Posted 08 September 2015 - 08:08 AM

Since about 1995 every car I've owned uses A/C in the defrost mode - the idea is that you are using the dehumidifying properties of the A/C - pulling the moisture out of the inside of the cabin.  I think most of them have a temperature sensor to be smart enough to not turn on the compressor in freezing weather.



#29 OFFLINE   stevedebi

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Posted 08 September 2015 - 02:43 PM

This reminds me of my 2003 CRV. In the defrost mode, you could hit the A/C button and the light would go out - but the compressor still ran. I think every car I've had for the past 15 years has turned on the compressor automatically whenever a defrost setting is used.

 

In one way it is useful - it runs the compressor in the winter, so that it stays lubricated.



#30 OFFLINE   Redshift

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Posted 03 October 2015 - 02:58 PM

Agreed. I've got to the point now where I don't use the windshield vents because it uses the AC compressor. I just turn recirc off and turn off all the vent settings but have it on say 3 or 4 speed, or crack the front windows. Takes a little longer but gets the job done. I think it's a bit underhanded of Ford to have the controls say AC is off when it's not, and the only way we know it's running, is through the electric usage gauge (or compressor buzz). If I want to open the windshield vents and blow warm non-air conditioned air at the windshield, I should really be able to. Like I was on my 78 Mini Cooper, Ford Sierra, Renault Clio, Jeep Liberty, and any rental car I've used. If Ford want to help improve gas mileage on this or future cars, maybe make the AC on/off switch do what the user wants it to do.

Just curious. Why don't you want the a/c compressor to come on? Mileage? It's not going to make that big a difference. Also, if you don't run your a/c occasionally, the seals in the unit will dry out. They use the coolant to lubricate all the fittings so it it never runs, they will dry out and crack, thus causing a leak and expensive repair.



#31 OFFLINE   kc1174

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Posted 03 October 2015 - 03:53 PM

Just curious. Why don't you want the a/c compressor to come on? Mileage? It's not going to make that big a difference. Also, if you don't run your a/c occasionally, the seals in the unit will dry out. They use the coolant to lubricate all the fittings so it it never runs, they will dry out and crack, thus causing a leak and expensive repair.


Yep I know all that and never questioned the need for the compressor to run, just that it ran when the ac light was off, but this is a resurrected thread from February and I have since sold the C-Max.

Edited by kc1174, 03 October 2015 - 03:55 PM.







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