1991 Miata AC system
20

Asked by Guru9DSXGS Jul 27, 2024 at 03:00 PM about the 1991 Mazda MX-5 Miata Special

Question type: Maintenance & Repair

I own a 1991 Miata that I bought used. The previous owner converted the AC
from R12 to 134a. He only replaced the low side inlet with a long adaptor. In
the past I was able to use cans to recharge the system when needed using
that adaptor. This spring, I was not able to charge it, so I took it to my local
shop. They replaced only the low side adaptor and charged the system.
Upon checking their work I found that the put a HIGH SIDE adaptor on the
LOW SIDE port! and again did not touch the actual high side. Since I do not
know how commercial AC charging systems work, I can only assume that
they charged the car through the my low side line with their high pressure
hose. Will this have caused any damage to my car's AC?

2 Answers
310,575

Gene answered 4 months ago

No it will not as the system they most likely used relies on heated gas to fill the system. The only drawback is that they would not be able to do an accurate low side/high side pressure readings.

Mark helpful
310,575

Gene answered 4 months ago

Those old AC compressors are way better than the garbage that they have today, so if the old compressor is still functional just keep using it. In my day I converted a lot of old R12 systems to 134A, the only thing I ever replaced was the dryer and the oils during the flush of the system. Heck back then the place I worked at had a bunch of loaners then he said just pull the old freon out and recharge with 134 and let's see how long they last. An old tempo was the first one to blow but it went over a year before the compressor went and by that time the car was ready for the scrap heap.

Mark helpful

Your Answer:

Related Questions

  • 1991 Miata AC system 2 Answers

    I own a 1991 Miata that I bought used. The previous owner converted the AC from R12 to 134a. He only replaced the low side inlet with a long adaptor. In the past I was able to use cans to recharge t...

    1991 Mazda MX-5 Miata Special

    -

    Maintenance & Repair

  • 1991 miata fuel system electrical system 6 Answers

    Besides the fuel pump relay is there an actual fuse for the fuel pump in the Miata? I used a jumper for the FP and ground. Engine spins but no fuel. Just wondering if there is a fuse in the system ...

    1991 Mazda MX-5 Miata Base

    -

    Maintenance & Repair

  • 1991 Mazda Miata 3 Answers

    I have a 1996 Mazda mx5 Miata , with the special Corona engine in it . The body is rotted out and I'm looking at buying a 1991 Mazda Miata that is in mint condition except needing a new engine. I...

    1991 Mazda MX-5 Miata Base

    -

    Maintenance & Repair

  • My 1991 Miata headlights sometimes will not open at night? The headlights are on inside the hood.but will not come out.. 2 Answers

    My 1991 Miata headlights sometimes will not open up. They are on under the hood but will not come out. I have to sit at night and keep turning them on and off. The parking lights are on and the ta...

    1991 Mazda MX-5 Miata

    -

    Maintenance & Repair

  • Miata clutch 1 Answer

    I have a 97 miata will the clutch for a 99 miata fit

    1997 Mazda MX-5 Miata Base

    -

    Maintenance & Repair

MX-5 Miata

Looking for a Used MX-5 Miata in your area?

CarGurus has 60 nationwide MX-5 Miata listings starting at $8,500.

Postal Code:

Shortcuts

Search Mazda MX-5 Miata Questions

CarGurus Experts

  • #1
    Michael Kane
    Reputation
    3,360
  • #2
    Cyril Muckenhirn
    Reputation
    580
  • #3
    Nitro_408
    Reputation
    530
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Chevrolet Corvette
22 Great Deals out of 1,091 listings starting at $15,000
Used Ford Mustang
60 Great Deals out of 1,380 listings starting at $4,995
Used Porsche 911
30 Great Deals out of 483 listings starting at $21,888
Used BMW 3 Series
70 Great Deals out of 1,248 listings starting at $2,500
Used Toyota Supra
77 listings starting at $49,777
Used Chevrolet Camaro
10 Great Deals out of 285 listings starting at $9,995
Used Honda Civic
196 Great Deals out of 4,087 listings starting at $440

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.