Hi Guys. It's me again.
Basically another problem with my car. As always don't know what exactly is wrong with it but have some ideas.
So first things first. The symptoms.
When ever car has heated up, basically after 5-10 drive, when ever I turn on A/C my car seems to loose quite a lot of RPM.
First when I turn it on I hear a click, which I think is normal because the fan turn on, and then my RPM drops down quite a bit. Sometimes I even have the feeling that it will stall. Then of course after like 3-4 seconds it will pick up the revs but at the same second will drop again and so over and over again.
This also happens when I turn on headlight, but it is not as noticeable as with A/C.
This will also happen when headlight are on and I will turn the steering wheel, so power steering is in use.
This is only happening while I'm idling. It obviously does not happen when I am driving as revs are usually 1.5-2K
Another thing that happens when my A/C is on while I am driving is that when ever I switch gears I feel that strange "pulling" feeling. Basically an engine breaking feeling...
This is also happening only when my A/C is on.
However I have notices something similar when I am driving with A/C off at around 35-40MPH in 4th gear. As soon as I release gas pedal I have this same feeling again.
First I though that this might be something to do with alternator so I checked it and it is actually overcharging at 14.9 instead of normal 14.5-14.6 which I think won't give any harm. Isn't it?
Then after I checked the alternator I read couple of articles about idle valve control which costs around £25 on ebay and can be easy changed. But I don't really want to spend any money on it if it's not the case...
So my car is a ford focus 1.6 Petrol (Zetec)
Please let me know if you do require any more information and please forgive me if I haven't explained everything properly. English is not my first language.