sometimes you miss the obvious......

geeman

geeman

Active user
Sep 4, 2013
69
8
farnham
well I've had the cougar nearly 2 weeks, and loving it, super smooth, and handles great. I have been keeping an eye on the mpg, as a comparison to my last car, a mk3 golf gti 2.0, this week I noticed a drop, and a slight lack of "pep" I checked the air filter, which looked brand new...plugs also new, as per the service book, then I looked straight ahead...and saw the air con was on :giggle: Christ...it was like hitting a turbo button..ok...it wasn't like that at all, but the performance was back, and an instant improvement on the computer with the economy! :love: ...what a noob....
 
Yep. I'm a bit OCD so I like to switch everything off when I shut the car down. Took me a few days to notice that every time you switch the HVAC on, it puts the aircon on as well and you have to manually deselect it.
 
spjmorris said:
switch it to any other position than screen only
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That only works if you started the car with it in that position and then change it.

What's unusual (to me at least) is the fact that if you start the car with the HVAC in the . (off) position and turn it to - for example - face only, the A/C switches on. Never seen that before. It's like the car was designed for a particularly hot climate.
 
A lot of newer cars are like this, with the AC always on, I've read its actually better for the system as people tend not to use it in winter and then blow seals, dunno how much truth there is in that.
 
Yeah when my AC is on and I'm driving at steady speed, you can feel it when it kicks in and out, the car slows down when it kicks in and speeds back up when it knocks off . . .
 
Didn't make much difference on my one?

If there was a recall for an issue with the ECU misbehaving with the A/C compressor engaged I'd be inclined to experiment with disconnecting the A/C wire on the ECU and seeing the difference?

How old are the vehicles of people having a big issue? Maybe there is a link?


Regards,
Andy
 
kittylover said:
Yeah when my AC is on and I'm driving at steady speed, you can feel it when it kicks in and out, the car slows down when it kicks in and speeds back up when it knocks off . . .
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Ditto, although I (perhaps incorrectly) attributed it to the fact it needs recharging
 
spjmorris said:
Ditto, although I (perhaps incorrectly) attributed it to the fact it needs recharging
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If it was so low as to cause mechanical issues then the system 'should' disengage itself, unless you find yourself on the cusp of activating/deactivating the pressure switch.

I'd get a recharge (proper one should take more then an hour, ask questions if it takes twenty minutes..
) and suck-it-and-see as they say.



It's not unheard of (indeed it's logical) that A/C will sup some engine power but if it's at the point it causes pronounced surging then I'd be inclined to think something else is wrong.

Other thing I guess that could rule out one potential issue would be to pull the A/C clutch fuse and see if pressing the A/C button changes drivability.... Not 100% certain that'd work though as I don't have a car with me to try it on.

Regards,
Andy
 
The cougars especially the v6 did suffer from issues with the engine surging when the clutch kicked in. There was an ecu update which altered the fuel tables to give the car less of a flat spot when the ac engaged

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