Jump to content
Do Not Sell My Personal Information

Rev Counter Drops At Slow Speed Due To Air-Con Clutch


Recommended Posts

2004 (05 plate) Ford Focus 1.6 petrol.

I have noticed that when I an slowing to a stop in neutral, the rev counter drops from about 750 to about 400 at which time I can heard a 'click' form the engine compartment which I think is the air conditioning compressor clutch engaging. The rev counter recovers then a few sec's later another click and it drops again. When the car comes to a stop this also stops.

This only happens when I have the heater switch on (all the blower settings do work) even though I don't have the air con switched ON on the dash. The air-con switch does appear to function (light ON/OFF) normally when pressed.

The Heater is set to the windscreen normally.

I've tried switching everything on whilst stationary to provide some load on the battery without being able to reproduce the problem.

Any advice would be appreciated.

Link to comment
Share on other sites

OK so the engine has to work harder to power the air con, but by all accounts, it seems to not be reading the air intake and thus not adjusting the revs correctly. Start with the air flow sensor, clean it off with electrical contact cleaner and that should help.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Create New...