pmxdnts Posted May 21, 2012 Report Share Posted May 21, 2012 I have a 2011 Ford Edge SEL and I noticed recently that my AC is coming on when I start the vehicle. The problem is that the AC was off when I shut the car down. And when the AC turns on automatically, I cannot shut it off. I hit the off button, the AC shuts off and immediately turns back on. It appears to be an intermitent problem and my shop has never seen or heard of this issue before. Has anyone else seen this problem yet? Quote Link to comment Share on other sites More sharing options...
wlepse Posted May 21, 2012 Report Share Posted May 21, 2012 I haven't seen that in particular but I have seen the MFT system lock out control and force its own idea of what should the HVAC should be doing. But to be honest most of the time it hiccups it is either in auto and we have no control to change things or it is off and we can't turn it on. Once I noticed it changed from single temp to dual but that was it. What version of the MFT are you running? So far with the rewrite my HVAC has been much more stable and reliable. Quote Link to comment Share on other sites More sharing options...
akirby Posted May 22, 2012 Report Share Posted May 22, 2012 You really don't need to control the A.C manually - just leave it on auto and let it do it's job. It dehumidifies the air even when it's cold outside. 1 Quote Link to comment Share on other sites More sharing options...
wlepse Posted May 22, 2012 Report Share Posted May 22, 2012 You really don't need to control the A.C manually - just leave it on auto and let it do it's job. It dehumidifies the air even when it's cold outside. This may be true but you still should have the ability to turn it off should you decide. Besides, if this is randomly changing state it could be a sign something is not right with the MFT install or hardware and is worth investigating before they have a bigger problem. Quote Link to comment Share on other sites More sharing options...
akirby Posted May 22, 2012 Report Share Posted May 22, 2012 This may be true but you still should have the ability to turn it off should you decide. Besides, if this is randomly changing state it could be a sign something is not right with the MFT install or hardware and is worth investigating before they have a bigger problem. I agree - but a lot of people think they have to turn the A/C off when they don't really need to. Quote Link to comment Share on other sites More sharing options...
NCHeel Posted May 23, 2012 Report Share Posted May 23, 2012 You really don't need to control the A.C manually - just leave it on auto and let it do it's job. It dehumidifies the air even when it's cold outside. You don't need to, but I prefer to have the compressor run only when I want to to- cooling or defrost. Gas mileage would be the main reason, but extra wear on the applicable components is certainly another. Oh, and there's the tornado-sounding cooling fan that comes on too... Quote Link to comment Share on other sites More sharing options...
akirby Posted May 23, 2012 Report Share Posted May 23, 2012 You don't need to, but I prefer to have the compressor run only when I want to to- cooling or defrost. Gas mileage would be the main reason, but extra wear on the applicable components is certainly another. Oh, and there's the tornado-sounding cooling fan that comes on too... The fan has nothing to do with whether the A/C is engaged or not. I think the extra wear and impact to fuel economy is negligible, thus the recommendation to ignore it. Quote Link to comment Share on other sites More sharing options...
NCHeel Posted May 23, 2012 Report Share Posted May 23, 2012 The fan has nothing to do with whether the A/C is engaged or not. Really? I'll need to pay closer attention being a newer owner but I could have sworn that if the fan is on and I turn off the AC the fan goes off immediately. Quote Link to comment Share on other sites More sharing options...
Waldo Posted May 23, 2012 Report Share Posted May 23, 2012 Which fan are we talking about? The big one behind the radiator is directly tied to the A/C system. A/C system pressure is one of the key inputs on the table that determines fan speed. The climate blower fan (the one inside the dash that blows the air on you) is also indirectly related to the A/C system. If you force A/C off but leave the fan speed on auto, it will increase the fan speed to try to compensate. Gas mileage is a good reason to turn it off, extra wear is not. In fact generally an A/C system needs to be run to keep itself lubricated and avoid drying out of the seals. I'm not 100% sure about the Edge system, but on other Ford systems the A/C compressor is automatically cycled and purged at every start up just to keep the fluids circulating, though this is not related to the OP's original issue. Quote Link to comment Share on other sites More sharing options...
NCHeel Posted May 23, 2012 Report Share Posted May 23, 2012 I'm talking about the engine cooling fan behind the radiator that is on pretty much whenever the AC is on. I've never tried the "auto" on the climate system except as it is programmed to come on with a remote start. I do look forward to a frosty car after work as the remote works from my office. Quote Link to comment Share on other sites More sharing options...
akirby Posted May 23, 2012 Report Share Posted May 23, 2012 I'm talking about the engine cooling fan behind the radiator that is on pretty much whenever the AC is on. I've never tried the "auto" on the climate system except as it is programmed to come on with a remote start. I do look forward to a frosty car after work as the remote works from my office. Sorry, I thought you meant the cabin hvac fan. I don't hear the external fan on mine. I always use Auto - just set it and forget it. Adjust the temp just like you adjust the thermostat at home. You can change the fan speed just by adjusting the temp up or down or turning it off temporarily. It's a great feature and I don't understand why people don't use it (my 17 yr old daughter being one). Quote Link to comment Share on other sites More sharing options...
DKF Posted August 9 Report Share Posted August 9 My problem sounds a little different, in my 2011 ford edge sport. I can have all climate controls off and the AC will come on by itself- and none of the controls will let me shut it off. Or- I can be running the AC and it will shut down, make a blinking sound as if I'm pushing the temp button repeatedly, eventually I can get it to run again but mins later same thing again. very frustrating. Any one have an idea on this? Quote Link to comment Share on other sites More sharing options...
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