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Post Info TOPIC: a/c questions and r134a conversion quiestions


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a/c questions and r134a conversion quiestions


ok so im still on a r12 system in my 89 toyota supra and i seem to lose about a can'ish every year...last year i poped in a can and my ac got almost too cold...this year i did the same and its not near as cold...55 deg at the vent. and that sounds nice and cold but its not...its still pretty warm in the car (80 deg)and this was not the case last year...now you should also know im not using any of the proper tools for this...i usually just drop in a can and go and im good till next year...is it possible that i over filled it? is there a way without a manifold gauge set to kinda gauge this?

 

so now this leads me to part 2...i figure maybe its time for a conversion to r134a...is it worth it? i hear alot of people like it and alot dont...i hear i need to change to a paralell condensor or someting? maybe someone here is good with mvac stuff that could help me out...im a noob at a/c and dont want to mess anything up...and i want the a/c to work as long as it can cause when it goes out its gone for good and its toooooooo humid around here for that....



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sorry guys didnt realize i had a simalar thread from last year...admin you can move this one over or delete the old one or whatever.


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I don't remember the post about your A/C ? Is it all fixed up now and work well ?

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Guru

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no this post is new so all questions apply but there is aonther thread almost the same thing from last year....i never really fixed it i was just given some old cans of r12 last year so i was ok...but i need to make it more current anyway....so feel free to answer away.


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On the charge of your R-12 System sounds Like it's still low on Gas . If you over charge them they Ice up or even can Lock up the compressor . To do the R-134 conversion the correct way it's best to change the evaporator and use a Vacuum Pump to Pump down the System . But First if You have Leaks Like you must you need to repair them . Some Times you can see a Leak by the oil it Leaves . Check all the Fittings and the A/C Compressor Front Seal . Now I have converted systems to R-134 as is with all the old R-12 Equipment and did not Pump down the System and it did work ok biggrin



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Senior Member

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could try 414b it a direct replacement used by whirlpool in household refrigeration systems and would not require any modification other than a adjustment in the amount of refrigerant charge.

for leaks there is a die that can be added that glows when you use a specail light and glases

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Yes the die is a better way to find even slight Leaks they even make refrigerant sniffers . But refrigerant does have oil in it so Lots of Times you can see Leaks . I do think the old R-12 Cooled better then the 134-A does . I remember a warning that was sent out to our shop about how Flammable the New 134-A is and would be when we worked with it .

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well they have a sealant that you can use thats really cool for the 134 systems and that would be my main reason for swapping over...that and just having the whole system fresh again with new oil and everything...and be able to use proper gauges....i dont know what the parallel flow thing i keep hearing about is...and i need to do the dryer/reciever too but it looks almost like the nose has to come off to get to it and im really not feeling that...but if i put in another can of r12 it only leaves me one can so it might be my last summer with it....im confused at what to do.

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I would see if you can Find the Leak and repair it might hopefully just be a Fitting that you can tighten up . Then top off the charge with the R-12 you have . If Not I have heard from others that just did the 134-A Valve conversion and charged it up with the 134-A and it work well with all the R-12 hardware .

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