<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:<hr /><font size="1" face="Verdana, Helvetica, sans-serif">Originally posted by icarlisle:
<strong>Barnaby, is that just from cold? Because it stands to reason that if you are taking heat from the engine to warm the cabin, the engine will take longer to warm up and will stay on its fuel-rich cold start cycle for longer.
Mind you, if you have the heating on auto, it won't kick in till the engine reaches 75 degrees anyway - at least my 156 doesn't.
Ian</strong><hr /></blockquote><font size="1" face="Verdana, Helvetica, sans-serif">That aint quite the case! - the water is constantly circulated around the heater matrix, it is not thermostatically controlled, so turning up the temp dial will not make the car warm up any slower. the only thing that will have an effect there is the fan, which if on 1-3 will blow air though the matrix and cool it and thus the water circulating, and so possibly slightly slow it warming up. If on auto, the system waits until the engine is warm enough (about 45c? 75 is a normal operating temp this time of year?) so that the air blown through will not be cold. If you turn the fan control to 0 until it reaches say 50c it may warm up very slightly quicker, possibly cutting enrichment sooner, but it wont stop the water going round the heater matrix.
Also maybe if you put the recirc on and then manually switch off the air con, the cabin warms quicker and this may also help the engine warm quicker/turn enrich off sooner, but the effect would be very marginal.
But I have also noticed a drop in economy with my daily shortish but fast (lots of cold air rushing through from the off)journey. Colder denser air makes the car more powerful though
Dont try to warm it up by letting it idle (save the first 15secs to get the oil pumpin and reduce acid damage to the bores before you pull off)
Hold the rear end slide....don't run wide!
156 2.0TS Veloce Lthr (02/02), silver, black Momo, BMC filter,V6 intake, DS2500 Front-DS Perf Rear pads, Conti sportcontacts, OMP strut Brace
Built in Italy, on the last Friday before (hic) Xmas........:-/