Aircon Cold And Warm

[chrispb123456]

Looks like we have a full answer to the question and how the system works for those with dual air con.  Many thanks for your great help. one other question i have

 

i never had this climate control before so am unsure how it operates,

if i set auto  and the temp set is 22   which seems to be the factory setting   does the system automatically choose to use the air con  until the temp is down to the set  one  be it 22 or more or less.   then does it turn of the compressor when its not needed ,  i was just wondering if its simply best to turn it to  auto and leave it alone,  i dint want the compressor running all the time if not needed   but if it is only used  as and when  by the system  then i can leave it.     

The only ones that shut off are the ones with the Ford petrol engines 2.0 & 2.3 the diesel compressor runs all the time when auto is selected, to turn off select econ.

They do say you use more fuel when running aircon all the time, I did try doing a comparison with the MPG but to be honest it's not worth worrying about.

[SilverBeast]

Not 100% sure but here's what I think.

(i) When on Auto it turns the air con on and off as required.

(ii)When On ECON it never uses the air con

(iii) If you press the windsceen/demist button on the climate control modle it will turn on the heated front screen (if fitted) and the air con to the front screen as air-con extracts moisture from the air too (which is why you get drips from the front (and rear for rear air con) of the car.

(iv) If you adjust the front temperature the rear temperature will track it. (This will be remembered and be the default for AUTO)

(v) If you adjust the rear temperature it can only offset one way up or down (I can't remember which) by a few degrees.

(vi) If you manually adjust the fan speeds or vent directions it drops out of AUTO, but will still use the aircon as required.

 

I suggest you have a play with the controls (while parked) and see what it will let you do.  I leave it on AUTO all the time (not ECON) as it will exercise the system moset weeks and prevent any seals drying out.  Most cars recommend you turn air-con on at least once a month for this reason.

 

I suggest you also check air and pipe temperatures as I did above and report back.  If you believe there is an issue, connect to the Climatronic module with VAG-COM and check for any faults (just for this module).  Record then clear these, run the car and see if they come back.  Report back.

 

While your at it I suggect you also check the Rear Heater (Booster Heater) for fault codes.  And make sure the run-on/auxilliary coolant pump is running with the ignition on (car not started). The Auxiliary coolant pumps on the 130 and 150's don't run after switch off, only while the ignition is on.

[marinabrid]

oh   must have forgot    i have gone from diesel mk 1  to a 54 reg  petrol  v6 automatic in the mk2   so no booster heater,  i have put the car,  a spare D5WZ booster heater and exhaust  and a new air con compressor for mk1  on the for sale section 

 

will see how it goes over the coming summer and what if any problems it gives me !

[SilverBeast]

A bit quicker then! I suggest you update your signature.

[marinabrid]

  Have now changed sig , yes  its is a tad faster !  no doubt the fuel bill will now go up but as we only do 800 miles  year i don't    think it will hurt.