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Discussion Starter · #1 ·
Hello!

Purchased a used B-Max 1.0 Ecoboost 120bhp Titanium (late 2012) last week and picked it up on Thursday just gone as I really liked the car! For the kids it is brilliant being able to get and out with the sliding rear doors and the fact I like the Ecoboost engines (the person I live with has the E/B Focus (late 2013) and it is a brilliant car to drive.


I've noticed with driving it over the weekend that the engine fan comes on if the A/C is used on the climate control, I've never experienced this in any car I've owned before that has had A/C.
At first I wasn't sure it was the A/C but today whilst out I've tried turning the A/C on and off and it only comes on when the A/C is turned on. For example today after starting the car and putting the A/C on within 30 seconds of leaving the house the engine fan comes on, the car wouldn't have even heated up enough to justify the any high temp for it to come on.
The person I live with doesn't have this happen when he uses A/C in his focus, which makes me wonder if this is an issue/problem.
If the A/C has been on in my b-max it continues to stay on and wind down even when I've turned the ignition off (for about 5-10 seconds).


It's frustrating as you do notice that the driving of the car changes, with it being louder, a little juddery when idle and notice (or what I think to be a slight reduction in acceleration).


Is this normal? I'm not a mechanic and don't claim to be! But my gut feeling is that this isn't normal..
Just wondering if the community here could help me or pass on any advice about their cars and if they have the same problem?


I've tried googling it and have found that some people with Fiesta's have bought up this issue and someone had put pictures up about the positioning of the fan being wrong - maybe a design flaw. I note this as the salesman said they based the B-Max on the Fiesta..?


Appreciate any help please! Concerned I may have a problem I need to get sorted with the dealer.
 

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I cant say i have ever noticed the fan running with the aircon on, but the fan is pretty quiet anyway. Next time i am out, i will try it with the windows down to check.
 

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As mentioned, it's normal for the fan to be on for air con. The reason is that the vehicle uses the same fan for both engine cooling and condenser. It's also normal for it to run on for a few secs after ign off.My previous car had two fans, one for engine cooling and one for condenser and both fans were PWM controlled. B-Max fan just seems to run at one continuous high speed hence why it's so noisy.
There is a slight change at idle when EMS receives air con request signal from the HVAC unit which is quite normal but nothing concerning.
B-Max is a highlycomplex car, bit of a shock for those who think it's simple,I think there are at least two different CANspeeds. I was a bit sceptical with EPAS but I do prefer it's operation to hydraulic.
Having said that, mine has now done 32k and here's a list of what's gone wrong;
Nowt
 

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Discussion Starter · #6 ·
Thanks JackKook and Pegleg, certainly puts my mind at rest. Thought there was potentially a serious problem. Never experienced in on another car before. That said this is the first car I've had that came with climate control. I've had other cars with a/c but not climate control.

Why is it the fan comes on like I've described in the b-max but not the focus? Is it to do with the fan make up as pegleg described. For example does the focus have two (can't say I've ever heard of any fan coming on in the focus).
 

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Yes, the Focus does have two fans and is very different. I notice you have access one. Pop the bonnet open and have a look.
Don't worry, your B-Max a/c is functioning as it should.
 

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Yep, tried my aircon out today and the fan came on for a bit. I hadly notice though as its not very noisy. I had to open the windows to hear it (perhaps i am going a bit deaf).
 

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Havent actually used the aircon too much as its not been warm enough most of the time. I do switch it on every couple of weeks.as i think you are supposed to or if it gets really warm. It does have an adverse effect on mpg, which is why i only use it when neccessary, but many who complain about poor fuel economy keep it on all the time.

In the summer, I'm sure it will get a lot more use, though its nice to open the windows and get real fresh air if you are not going too fast.

On that subject, ive noticed quite a buffeting effect driving the b max with the windows open compared to any other car i have owned. It really affects my ears.
 

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It's sensible to use a/c at least half hour every week to stop the seals drying out, no matter what time of year. Secondly, yes, it used to be the case that a/c affected mpg, but that was in the days of yore when the system used allbelts and pulleys. Not so today with electric fans. Try doing the same journey with and without a/c and you'll barely notice the difference. Using a/c at frequent intervals will alsohelp keep nasty bacteria down. it's false economy not to use it.The 'buffeting' you refer to is know as 'boom', common on most vehicles ,it's worse when you open just one rear window. The cause is air pressure difference and can be prevented by opening another window to equalise pressure, ie boom by opening rear window then open one of the fronts and vice versa.

Edited by: pegleg
 

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The automatic heating and cooling does not work properly if the aircon is off, I cannot notice any difference to MPG with it on.
 

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Yea, i found that the auto setting with aircon off was maintaining a high fan speed trying in vain to cool the cabin to my selected temperature.

I did find that fuel economy was down by around 5% when i used aircon all the time. May give it an extended go now the weather is warming up.

On my old fiesta mk6 and fiesta mk7, i did notice a power drop with the aircon, moreso on the mk 6, i think.

Ave mpg is 44.9 on my 1.0 123 bhp at the moment, so will aee what happens to it.
 

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A/C can be useful even in winter as not only can it cool the air but also dehumidifies it . In winter it means the air hitting the windscreen on defrost is warm AND dry so defrosting/demisting happens faster.
 
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