Patrol 4x4 - Nissan Patrol Forum banner

1 - 17 of 17 Posts

·
Registered
nissan/1989 gq
Joined
·
446 Posts
Discussion Starter · #1 ·
if found a thread on outers about doing a dyo a/c refill.
i know, that it isn't exactly legal, but theoretically if someone wanted to do it how difficult it is? did anyone tried it?
could use those kits from ebay:
2x bottles AIR CONDITIONING R134a refrigerant GAS CAN - eBay (item 390273504571 end time Feb-18-11 02:16:13 PST)

car R134a refrigerant gas piercing & charge hose kit - eBay (item 260710380453 end time Feb-18-11 02:26:38 PST)

what could possibly go wrong? could it be any dangerous? and what would happen if i fill r12 system with r134. i assume 89 GQ will have r12 in a/c.

my a/c doesn't work and i have never seen it working. i don't want to spend big money on it, pay for having it refiled just to find out that i need new compressor or the whole system rebuild.
 

·
Registered
Joined
·
3,955 Posts
you need a vacuum pump too.
and you need to find the leak first.
 

·
Premium Member
nissan
Joined
·
142 Posts
if you go from R12 to R134A all the oil needs to be cleaned from the system and the dryer changed.
be carefull recharging the gas as you can overcharge the system.
My advice take it to an auto electrician and have it recharged with "hychill" gas, it will go straight in an R 12 system

Tim
 

·
Registered
nissan patrol
Joined
·
2,149 Posts
Its not 100% related to you but
there was a study done by some universisty a little wile ago about useing LPG in your aircon system. the pro's were it was alot colder the a normal refriderant and if there is a leak in the system it can be detected easyer. and aparently in an accedent there wasn't enough gas to be dangerouse.

I could be rong but i thought the r12 system has differnt valves then r134? and if your changing gas you will need to vaccume all the r12 & any air out of the system and that takes a wile and you need the proper machien to do it. thats why its cost like $80 plus. its not as easy as just droping some air a tank
 

·
Premium Member
nissan
Joined
·
142 Posts
the Hychill gas is a hydrocarbon gas

Tim
 

·
Registered
nissan/1989 gq
Joined
·
446 Posts
Discussion Starter · #6 ·
i don't think there is any old gas left. i tried to push on those tyre valve like things on the pipes under red and blue caps and there was no gas hissing out. when i tried it on my old commodore years ago gas was hissing out.
i heard about people filling a/c with propane, bbq gas, and i don't know what, but i don't really want to go that far.
i just want to know what will happen if i just fill it up with gas? what happens if i full it up with r134? is it just not gonna work or may car is going to explode. basically what could go wrong.
 

·
Registered
nissan/1989 gq
Joined
·
446 Posts
Discussion Starter · #7 ·
that ebay kit would cost $45. i thing i have crack at it as i have not that much to lose. my a/c doesn't work anyway.
 

·
Banned
nissan
Joined
·
189 Posts
if there is no gas in the system it means there is a leak, if you dont find the leak and repair it you are wasting your time and money. the system needs to be charged with gas and a special green die that will show exactly where it is leaking. Take it to a specialist. As said above it not as simple as just putting gas in. All moisture should be removed by a vacuum pump before charging, and the amount of gas should be exact.
 

·
Registered
nissan patrol
Joined
·
160 Posts
How long ago was it since the A/C worked? You really need to find the leak though, if it's been years since you had it regarded or nothing was done, then maybe it's just the system has slowly lost gas of a long time. Remember the there are rubber hoses and joints which can over a long time leek.
Check and see in the condensor (in front of the radiator) to see if there is any dark spots anywhere on or around it as this will indicate a potential leak.
Check for any dark greasy marks around all the joints and on the hose. Check none of the hoses have rubbed on anything.
And see if you can turn the clutch by hand with it engaged, ignition on not started and A/C and fan switch on. If you can turn it then should be okay.
you need to evacuate the system and change the drier but otherwise it might be worth a go.
 

·
Registered
nissan patrol
Joined
·
2,099 Posts
Don't do it. You'll waste your money and more than likely damage your compressor. R12 uses a mineral oil and 134A uses a sinthetic. The 134 will probably make the mineral emulsify, (turn white watery/jelly like) And will kill your compressor. Take it a auto fridgy, find the leak, fix it and use an R12 drop in replacement. Or if you ask around, you will find some places that still have R12 in stock. It is still available (I've got 20 kgs here) if you know where to look. The R12 is MUCH more eficient than the newer drop ins as well. So the unit will work to capacity.
 

·
Premium Member
nissan
Joined
·
2,282 Posts
I don't think any more warnings or advise is going to be worthwhile, It seems the OP had their mind made up on what they were going to do before they even posted.

4 out of 5 respondents advised caution or don't do it and the other was non commital but the OP wants to go ahead anyway.

Got to love that 'eh?
That's the strange thing, he is going to spend about $50 and wait 8-10 weeks for it to arrive.

Then he will put it in only to find it will more then likely leak straight back out.

Much better off going down to your local auto electrician with that $50 and getting a quote done on repairing your system.
 

·
Registered
nissan
Joined
·
372 Posts
get some nitrogen put about 1000kpa get some big blue or the tight ass way soapy water in a spray bottle find the leak next those 2 refrigant will no work different oil base IT WILL **** YOUR COMPRESSOR do your research $50 for a home kit vs new compressor and if you have air in your system this cause corrision you need a vac pump use google do some research
 

·
Registered
nissan/1989 gq
Joined
·
446 Posts
Discussion Starter · #14 ·
ok so i probably leave it alone. going to electrician or a/c specialist was never an option as it would cost me close to what i paid for the car. when i tried, they told me that they will modify and regas it and we will see then whats actually wrong with it and need to be replaced. car get driven only on weekends or so. i lived without aircon in it for 3 years now so i'm kinda used to it.
that bring another question: how difficult is it to modify the compressor for inflating tyres? endless air is a/c compressor anyway.
 

·
Registered
nissan
Joined
·
102 Posts
there is a new gas avaliable caled hr12 it is more or less a lpg/propane and has been well tested for explosions and if it leaks ect it doesnt require a licence to use but u will still need a vac pump to vac system down and a set of guages, however if ur system peviously had r12 in it you will also need to change oil in the system as well as replace reciver dryer and the charge fittings are different, if it previously had r134a you should be right to use it
 

·
Registered
nissan patrol
Joined
·
2,149 Posts
for the endless air set up you asked about, its easy. just unbolt the 2 pipes off the compressor start the car and look at with one sucks and wich one blows. cut the pipes and take them to pirtek or somwhere like that and get some fitting fited for your air hoses. and fit a breather/filter to the intake side. run the intake into the cab otherwize you will stuff the compressor when it fills with water
 

·
Registered
Joined
·
851 Posts
I think the changeover from R12 to R134 cost me about $220. Pump down, new receiver drier, new gas. It ran for about 3 years before it needed a regas (about $120), so there is a small leak still, but thats OK.
 
1 - 17 of 17 Posts
Top