Tickover on my 4.4 petrol has always been 750rpm. Everything seems to be ok but last few days tickover has dropped to 600rpm. This is when warmed up. Had new alternator and battery in July this year.
Any ideas? Not Galway but Balmoral green actually
148,000 miles

It will do that if the aircon is switched off. That's normal AFAIK.

With aircon ON, it rises to c.750 RPM.

Your right, I switched it off last night on way home lol
Spent hours needlessly worrying over nothing.
Cheered me up no end!!
 Not Galway but Balmoral green actually
148,000 miles

My tip, NEVER switch the aircon off... works great all year round and keeps the oil in the system well distributed and the seals soft, helps prevent gas escaping and generally does the system a lot of good...

Use it or lose it....  Pete
__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand Sold
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Sold
2002 L322 Vogue 4.4 V8 Epson Green (Fatty Offroader) Sold
-Click for Project Fatty off roader-

I tend to keep it on all year round for the reasons you give but occasionly turn it off, along with the radio, to listen to the car. Never noticed the revs drop before. Aircon on and revs back to 750.  Not Galway but Balmoral green actually
148,000 miles

 Pete
__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand Sold
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Sold
2002 L322 Vogue 4.4 V8 Epson Green (Fatty Offroader) Sold
-Click for Project Fatty off roader-