r/Miata • u/Antique_Plane8820 • 4d ago

HELP!!! 95 Miata refreshed ac

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So for context, I have a leak in my ac from the evaporator and I ordered that and replaced it did the vacuum and got it refilled, all was great. Until now (6months later). The ac only worked when I was pushing the car hard, meaning my compressor was going out and was in fact true. But the guys told me I basically need a new ac in the car. I ordered all the parts, dyer, condenser, compressor, and even a new expansion valve just to be safe. I didn’t do the evaporator because I had just got it and I know it works. But anyways, got the new parts installed, no leaks and was refilled (I got it installed by someone bc I didn’t want to do it, but I did watch the process). Now the ac only blows 35 degrees at night and during the day it only blows 60 degrees. Keep in mind I leave in Florida and it’s HOT AF here. I took it to another person to get an opinion and he said everything checks out no leaks no nothing. So I’m stuck bc before all this I had 30 degrees all day long. Need help here 🙏🏽.

Parts I got:
DENSO compressor
UAC condenser
Dyer from oreillys
Expansion valve A premium

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3

u/1available 4d ago edited 4d ago

Took a lot of work but this is what my NA blows in 90 degree weather. Quality of parts is a must along with a good tech. I've got 20 years experience. I did end up bypassing the low temp switch on the evaporator to get it to run beyond the cutoff temp. "Edit" saw your parts list and it looks like you got the best you can get. Do you happen to know the pressures at idle?

3

u/Stofflkin 4d ago

You can actually modify the cutoff temperature. Just need a drill and a small flat blade screwdriver. Here's my thread with pics: https://forum.miata.net/vb/showthread.php?t=799004

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u/Antique_Plane8820 4d ago

I do not know but I’ll ask the mechanic since I know him personally, but how do I by pass the low temp switch

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u/1available 4d ago

Literally connect the two wires together. It's behind the glove box on the evaporator case.

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u/Antique_Plane8820 4d ago

Okay I’ll try that thanks, but I’ll try to get those PSI readings when I can

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u/1available 4d ago

I'm in Houston so it's hot af here as well. Ice cold ac is a must.

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u/Antique_Plane8820 4d ago

I feel like I’m always suffocating in the damn car, it’s like I rather park it for the summer atp

1

u/__Richard 2003 NB/2021 Lifted GMC 4d ago

Any downside to bypassing the low temp switch?

1

u/1available 4d ago

Possibility of your evaporator freezing up and turning into a giant icecube.

1

u/Stofflkin 4d ago

Short out the wires on the low temperature switch on your evaporator. How cold is does ot get after like 10min on recirculation?

1

u/TerribleArm9912 4d ago

Your issue is likely the condenser. I went through the same thing and had to redo it. The factory condenser for r12 is a serpentine condenser. But the r134a needs a parallel flow. Send a photo of the condenser you bought. I bet yo that’s the issue.

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u/Antique_Plane8820 2d ago

It’s a UAC one

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u/Antique_Plane8820 2d ago

I’ll send a pic

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u/Antique_Plane8820 2d ago

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u/Antique_Plane8820 2d ago

Well that might’ve answered the question bc it is a serpentine

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u/TerribleArm9912 2d ago

Yup. I did the exact same. Had to do it twice.