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How are people mixing refrigerants? #5449386 06/08/20 11:08 PM
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Chris142 Online Content OP
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I have been getting calls from people that have put R134a into their newer car that calls for R1234yf. How are they doing this as the fittings are different? One lady put a whole AC pro can into her 1234 car. How??


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Re: How are people mixing refrigerants? [Re: Chris142] #5449391 06/08/20 11:20 PM
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JHZR2 Offline
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I’m surprised any 1234 cars need service yet.

Re: How are people mixing refrigerants? [Re: JHZR2] #5449397 06/08/20 11:26 PM
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Originally Posted by JHZR2
I’m surprised any 1234 cars need service yet.

Seems to leak more than r134a. Lots of 17-18 cars needing a recharge already.


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Re: How are people mixing refrigerants? [Re: Chris142] #5449401 06/08/20 11:48 PM
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Originally Posted by Chris142
I have been getting calls from people that have put R134a into their newer car that calls for R1234yf. How are they doing this as the fittings are different? One lady put a whole AC pro can into her 1234 car. How??



Redneck ingenuity LOL


Chris142... Do you think vehicle ac systems need to be recharged every so often?? Like every 8-10 years for example..

Last edited by bbhero; 06/08/20 11:49 PM.

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Re: How are people mixing refrigerants? [Re: Chris142] #5449413 06/09/20 12:31 AM
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Swap out the 1234yf charge hose fitting for a R134a one. I do this on retrofit R12 systems all the time because retrofit fittings leak. Just a guess as I haven't messed with 1234yf yet.


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Re: How are people mixing refrigerants? [Re: bbhero] #5449418 06/09/20 12:42 AM
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Originally Posted by bbhero
Originally Posted by Chris142
I have been getting calls from people that have put R134a into their newer car that calls for R1234yf. How are they doing this as the fittings are different? One lady put a whole AC pro can into her 1234 car. How??



Redneck ingenuity LOL


Chris142... Do you think vehicle ac systems need to be recharged every so often?? Like every 8-10 years for example..


Not answering for Chris.....But, Yes.....Most vehicles could use a vacuum & recharge every 10 years or so.


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Re: How are people mixing refrigerants? [Re: bbhero] #5449497 06/09/20 07:13 AM
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Originally Posted by bbhero
Originally Posted by Chris142
I have been getting calls from people that have put R134a into their newer car that calls for R1234yf. How are they doing this as the fittings are different? One lady put a whole AC pro can into her 1234 car. How??



Redneck ingenuity LOL


Chris142... Do you think vehicle ac systems need to be recharged every so often?? Like every 8-10 years for example..

More like 5-6 years. All systems leak a little. When they get 5+ years old they may still cool ok but will be low enough to not move the oil. Then the compressor locks up and you spend $1500+ to fix it.


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Re: How are people mixing refrigerants? [Re: Chris142] #5449499 06/09/20 07:16 AM
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I am very familiar with the 1234yf. I was involved with the change-over on our SUV's in the plant. With that there is no reason you cannot go back to r134a in these systems. I just had a 2013 XTS in the shop that needed a new compressor and condensor. I discussed the price of the 1234yf vs the r134a and there was no hesitation of the customer to go back to the older freon. In 2013 XTS could have either freon as they were transitioning. The 1234yf required 1.30lbs of freon and r134a required 1.5lb per the service manual. This is pretty common practice with the high freon price for 1234yf. I have a specific set of gauges for r12, r134a and 1234yf.

Re: How are people mixing refrigerants? [Re: Chris142] #5449502 06/09/20 07:18 AM
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Interesting! I am curious, as I have a couple of 10 year old vehicles that haven't had their a/c touched--another is 20 but I can't vouch for its first 15 years.

is there value in periodically testing the pressures in the system?


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Re: How are people mixing refrigerants? [Re: Chris142] #5449505 06/09/20 07:23 AM
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Funny enough just this weekend I went to turn the A/C on in the Giulia and noticed no cold air. Couldn’t hear the compressor engaging either, popped the hood and took a look. Sure enough the compressor was just sitting there, no engagement at all. Was going to check the charge and discovered it has 1234yf, to the dealer it will go...


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Re: How are people mixing refrigerants? [Re: supton] #5449546 06/09/20 08:21 AM
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Originally Posted by supton

is there value in periodically testing the pressures in the system?

No. The only way to check the charge is to remove what os in it,vacuum and recharge with a scale to spec.

I often get cars with normal pressures only to find them extreemly low on charge.


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Re: How are people mixing refrigerants? [Re: GMBoy] #5449548 06/09/20 08:22 AM
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Originally Posted by GMBoy
I am very familiar with the 1234yf. I was involved with the change-over on our SUV's in the plant. With that there is no reason you cannot go back to r134a in these systems. I just had a 2013 XTS in the shop that needed a new compressor and condensor. I discussed the price of the 1234yf vs the r134a and there was no hesitation of the customer to go back to the older freon. In 2013 XTS could have either freon as they were transitioning. The 1234yf required 1.30lbs of freon and r134a required 1.5lb per the service manual. This is pretty common practice with the high freon price for 1234yf. I have a specific set of gauges for r12, r134a and 1234yf.
we just got one of the trade magazines. It says that putting r134 into a 1234 car is considered tampering with emissions and carries a hefty fine

Last edited by Chris142; 06/09/20 08:23 AM.

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Re: How are people mixing refrigerants? [Re: Chris142] #5449562 06/09/20 08:31 AM
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Originally Posted by Chris142
More like 5-6 years. All systems leak a little. When they get 5+ years old they may still cool ok but will be low enough to not move the oil. Then the compressor locks up and you spend $1500+ to fix it.

Do you just vacuum, check for leaks and refill or do things like replace all o-rings?


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Re: How are people mixing refrigerants? [Re: Donald] #5449575 06/09/20 08:55 AM
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Originally Posted by Donald
Originally Posted by Chris142
More like 5-6 years. All systems leak a little. When they get 5+ years old they may still cool ok but will be low enough to not move the oil. Then the compressor locks up and you spend $1500+ to fix it.

Do you just vacuum, check for leaks and refill or do things like replace all o-rings?
if I replace the O-rings on the discharge side,schraders,orifice tube at the minimum on every car.


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87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
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Re: How are people mixing refrigerants? [Re: Chris142] #5449576 06/09/20 08:55 AM
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Originally Posted by Chris142
Originally Posted by supton

is there value in periodically testing the pressures in the system?

No. The only way to check the charge is to remove what os in it,vacuum and recharge with a scale to spec.

I often get cars with normal pressures only to find them extreemly low on charge.

Ah thanks. I'll mull that over, wife's car is getting up there in age but it's a necessity for her car to have working a/c. Is there any risk to messing with a system that isn't showing signs of problems? As in, crack open a non-leaking valve and it'll leak just to spite you?


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1999 Toyota Camry LE, 2.2L/4AT, 225k
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