Conversion of A/C Refrigerant (R12 to R134a)

[ment]

here's something na na-stumble ko over the net for those who are concerned ....

http://www.sanden.com/support/RETRO.html


Hope the info will be helpful to someone here.


BTW wala pa bang R-12a? And is it true na dapat palakihin yung condenser pag nag convert to 134a?

[scooby482]

thx for the info

[clyde]

very nice info. thank you sir!  

i had my 15 year old car running R12 converted to R132a system very recently. we did all the procedures mentioned in the link(it's my first time to read it) except yung step #6  . i was just relying on my good old A/C technician since he knew that i have my drier recently been replaced. importante lang daw is to make sure na completely drained yung old R12 refrigerant oil so sabi ok, go ahead, you're the master(i trust him a lot that's why since siya lang talaga nakapagpatino ng AC ko).

so far it has been running perfect(except my old noisy compressor, errrr who cares as long as it cools down my interior well and good)  

also i think what is mentioned in step #21 is a must.  bigger cooling fan(which i need to do first), if this intermittent rising temp on my guage is not cured, maybe a larger capacity condenser is next.  

it is much colder now and better performing than my old R12 induced system. almost two months now in this very hot country(Saudi Arabia). i hope it'll last long, hehehe   everything as-is except a new R132a refrigerant.

[Bikini Inspector]

That talks about retrofitting the compressor.
But I'm more inclined on buying a new compressor, even if it's too expensive for our older cars.
Anyway, car cooling really comes at a price.

My questions:

1) I may be too lazy to check old posts, but again, required na ba this year all vehicles to change to R134? Kelan ba?

2) Pls list the items to change and how much - e.g. compressor 10 to 15k, condenser 5k and so on

My friend's D#nso compressor costed him 14K
Is the price just right?

Tnx

[a/c tech]

That talks about retrofitting the compressor.
But I'm more inclined on buying a new compressor, even if it's too expensive for our older cars.
Anyway, car cooling really comes at a price.

My questions:

1) I may be too lazy to check old posts, but again, required na ba this year all vehicles to change to R134? Kelan ba?

2) Pls list the items to change and how much - e.g. compressor 10 to 15k, condenser 5k and so on

My friend's D#nso compressor costed him 14K
Is the price just right?

Tnx

on my experience, the parts needed to change is the compressor, filter/drier

plus you have to adjust the expansion valve(if possible)

and you have to flush all the lines and be sure that theres no oil left on the lines, and replace a new oil

I dont know the price of new compressors. it depends on the models

[utk505]

do you adjust the expansion valve everytime you install it even if its new

[scooby482]

utk..

ako minsan pag open ang valve adjust ko konti pero usually pag bago i dont adjust..

[ment]

I had mine converted na rin. For 2,500.00/lot including freon, drier, and expansion valve.

Nakakaasar lang yung pinagpagawaan ko. Ang ganda ng sales talk sa akin. Kesyo Mas environment friendly ang R134a etc etc .... Nung pumayag na ako. Walastik dun ko lang nalaman na wala pala silang recovery unit!!

Pinasingaw!     Sick b*stards

Please let us refrain from patronizing these shops na walang recovery unit.

[utk505]

utk..

ako minsan pag open ang valve adjust ko konti pero usually pag bago i dont adjust..

well justwant to ask ac tech regarding this bec notice ko lang almost every time post sya mern txv and adjusting it curious lang

[a/c tech]

well justwant to ask ac tech regarding this bec notice ko lang almost every time post sya mern txv and adjusting it curious lang

yes, everytime I have access to the TXV, even a brand new TXV, cause r-12 and 134-a refrigerants have different gauge reading, I mean like 134-a is lower than r-12 refrigerants in low-side gauge reading, so how can I be sure if the new TXV is for that kind of refrigerants if i wont check it. di naman nakaset yung new txv pag labas ng factory. para sure it will produce a good reading on the gauge.

[ment]

just a question... pag nag convert na ng R134a refrigerant what should be the gauge reading at idle and a/c on? 40psi?

[utk505]

yes, everytime I have access to the TXV, even a brand new TXV, cause r-12 and 134-a refrigerants have different gauge reading, I mean like 134-a is lower than r-12 refrigerants in low-side gauge reading, so how can I be sure if the new TXV is for that kind of refrigerants if i wont check it. di naman nakaset yung new txv pag labas ng factory. para sure it will produce a good reading on the gauge.

ah ok thanks for the reply

[a/c tech]

just a question... pag nag convert na ng R134a refrigerant what should be the gauge reading at idle and a/c on? 40psi?

25-35 psi is recommended low-side gauge reading

[ment]

25-35 psi is recommended low-side gauge reading

ok thanks  

mine i think is around 40psi nga. I'll just try and find a way to reduce the freon

[audio_hunter]

25-35 psi is recommended low-side gauge reading

sir a/c,

from wat i've read from other website, is it true that the actual psi reading (from lowside) plus 3-5 points is the actual temperature of the evaporators in fahrenheit meaning if manifold reads about 30psi + 3 = 33F = 0.5C temp reading or 35psi + 5 = 40F = 4.4C evaporator temp?

curious lang po ako sa mga sinasabi nila, co'z if it is true then we can share that kind of knowledge or tip to other ai members di po ba ?