Just Bought A Ghia

[Guest phillevy]

Do you mean by dual temp control the ability to adjust heater in back?

[Dally]

Richmond

 

Seat kid is right, it has one compressor but separate (two) evaporators. The one in the back is part of the rear heater/blower mechanism and coolant is piped to the back through pipes under the near side of the vehicle.

 

I was lucky to be able to compare performance of my previous zetec with single air con and my current v6 and in my experience, the overall cooling effect is much greater with the dual a/c.

 

The CC panel actually only makes proper sense with dual aircon- I really don't know why they fit the same panel to non dual a/c galaxies knowing fair well that the rear temp adjustment doesn't really mean much - just adds to confusion!!

[HJT]

The Galaxy manual states "For vehicles with single A/C, the rear temperature can be set to a maximum of 3 degrees higher but no lower than the front temperature setting"

 

Just noticed it also says "The rear air conditioning operates only in recirculated air mode" well thats a load of old cobblers, mine operates whether in recirculate or not. Unless they mean the air in the back is just conditioned and recirculated and the only fresh air conditioned air comes in from the front. Not very clear at all.

 

Just as an aside here, I managed to get a three seater settee in the back of mine today and close the rear door. Mind you, as the wife pointed out, I had just turned it back into a five seater B)

 

Howard

[Guest nimrod]

 

Just noticed it also says "The rear air conditioning operates only in recirculated air mode" well thats a load of old cobblers, mine operates whether in recirculate or not. Unless they mean the air in the back is just conditioned and recirculated and the only fresh air conditioned air comes in from the front. Not very clear at all.

 

The rear heater only operates in recirc mode as in it recircs the internal air considering where the aux heater exhaust is on a TDI! the fumes from it would possible get sucked in :o not a good idea

[Richmond]

If there is only one compressor, presumably the dual system's ability to cool is the same as the single air con system's, as the compressor is where the energy goes into the system to shift the heat from inside the car to outside (assuming that the compressors on the single and dual systems are the same). Presumably the rear outlet of the dual system means that the rear compartment cools more quickly with dual, but at the expense of the front cooling more slowly. The only real advantage, then, is the possibility of having an up to 3 deg C temp difference between front and rear, which is nice, but not a big deal (for me).

[HJT]

I don't think it's at the expense of the front cooling as I get bags of cold air coming out front and back (wouldn't want it any colder!). It maybe that the dual aircon has a larger compressor to allow for the extra cooling needed.

 

Howard

[Dally]

The 2.8 certainly has a larger compressor with variable output and may be this then gets fitted to other models that specify dual aircon.

 

I too like Howard agree that it's not at the expense of front cooling.

[Richmond]

I take it from Dally that the 2.8 has a larger compressor whether it has a dual or a single air con system. The larger compressor can presumably cool the car more quickly than the smaller one.

 

I don't know much about air con, but simply bunging in an extra evaporator can't increase the maximum 'cool' :unsure: delivered by the system, single or dual, can it? Thus, the 'cool' delivered to the rear by the dual air system must be at the expense of the front, unless the dual system can run the compressor at a higher output than the single system (in which case why fit a larger compressor to the single system?). The dual system doesn't deliver more 'cool', so far as I can see, but it does distribute it more quickly and it allows a modest temp difference between front and rear.

 

I'm not knocking the dual system, I'm just saying it doesn't seem to be a big deal.

[HJT]

The 2.8 has always come with dual aircon as standard hence the bigger compressor and I'm fairly certain now that the dual aircon has a bigger compressor whether standard in the 2.8 or as fitted as an option in the other models therefore does deliver more cool air.

 

Howard

[Richmond]

The 2.8 has always come with dual aircon as standard hence the bigger compressor and I'm fairly certain now that the dual aircon has a bigger compressor whether standard in the 2.8 or as fitted as an option in the other models therefore does deliver more cool air.

 

Howard

In that case it's got to be worth having dual air con if only for the bigger compressor.

 

I'm glad that we've sorted that out :unsure: .

[HJT]

Mind you it's bound to be more expensive when it goes wrong :unsure:

 

Howard

[Richmond]

And more likely to go wrong, with an extra evaporator and more fans (I assume). Still, it's probably cheaper to have it in dry dock being 'worked' on than to drive it.

[Denis]

:unsure: :blink: :D