Join Date: Jul 2003
Location: newcastle n.s.w aus
Re: R12 / R 134a
the poisition controls are vacuum operated in the ea falcon, the most common cause is the main vacuum hose coming of at the vacuum tree on the manifold as kieron said. this is the black hose and the heater tap is the green one, the other problem is behind the control panel, there is a white three way connector with a green vacuum hose going to it they often pinch off. r12 is leagal to use but those of us who care for the environment and have a consience will avoid it. most of the r12 is reclaimed gas, some companys clean this gas properly but the majority of people just put it staight into the next vehicle. this causes lots of contamination problems as far as oils and gases go.there are so many oils on the market now it is not funney, manufacturers for the austrailian car market only us pag oils which are more expensive but are more reliable in the long term. blend gases have also flooded the market, i would recomend people dont use these as they have a problem called a gliding effect where the differant gases can leak from the system at differant rates, affecting a/c performance dramaticaly with very minimal gas loss.
very rarely is it just a conversion from r12 to r134a, this is because most vehicles have gas leaks and converting it wont fix the problem.
a/c systems are very expensive to fix and even more expensive if they are not fixed properly the first time, and often result in compressor failure.
hear is a list of common gas leak problems for a ea falcon.
pressure relief plug on receiver drier
condensor (less common) unless you own a ef el falcon.
engine thermostats (because viscous fans dont work unless engine is up to temp and therefor dont draw air across condensor eficiently)
flap in fresh/recic dump box(lever breaks off)
there are probably some things i have forgoten but basically i'm saying get the job done properly by a reputable technition and pay the $ otherwise save your money.
also we have two compressors to suit ed v8 falcon new, i think they will also fit ef el v8 if anyone is interested.
i hope this helps, sorry if i bored anyone.