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93 MX6 Compressor replacement: results and questions

blaster3500 on Mon July 06, 2009 4:55 PM User is offline

Year: 1993
Make: Mazda
Model: MX6
Engine Size: 2.5 V6
Refrigerant Type: R134a
Ambient Temp: 85
Pressure Low: 30
Pressure High: 200
Country of Origin: United States

The car came from the factory with r12. A few years ago I had the car "converted" to r134. I think all they did was put oil and new refrig in it. It worked for around a year and started getting warmer. The shaft seal on the compressor was leaking and the compressor started to click so I stopped using my a/c. I decided to fix it and replaced the following:

-Reman Compressor
-Expansion Valve
-Evap. Core

I flushed all the lines with mineral spirits and blew the lines multiple times. Put it all back together with new green o-rings and o-ring lubricant. I used 6 oz. of ester oil. Pulled a vac with a 1.5cfm Mastercool pump for 1 and 1/2 hours. I ended up adding 24oz of r134a. I did not write down the pressures i know i know... if i recall they were 28-30, and 200. The ambient temp was around 80 degrees. I was getting mid 40's vent temp at idle with the blower motor on the third highest setting and 40 degrees driving around. The next day i went to go double check the pressures and the high side port stuck open for around 45 sec before I could stop it . So i hooked the gauges back up and added 12oz or refrig.

Ambient temp 85
Idle: Low- 28 High-175
Sprayed Condensor: Low- 25 High- 125
Motor Reved to 2,000rpm: Low- 20 High- 150

Now my vent temps are mid around high 40's at idle today on the way to work it hit low 40's cruising at 50 but it is usually 45-50 degree vent temps now. Is it a hair undercharged? I assume the pressures should be checked at idle? The specs my book show are Low: 21-26 and High: 185-213. Overall the a/c works fine for me but I just wish I could get back to 40-45 degree vent temps. Any input would be great this is my first time working on a/c. Thanks guys

94RX-7 on Mon July 06, 2009 8:59 PM User is offline

I would say yes, it would appear undercharged. Low side should be closer to upper 20s low 30s and the high side should be around 180 at that ambient at 2k RPM.

blaster3500 on Mon July 06, 2009 9:24 PM User is offline

A little more refrig seemed to do the trick. Now the gauges are about high 20's to 30 on the low side and the high is 200-225. When you spray the condenser the low drops to mid 20's and the high drops below 200. I am now getting vent temps of 40-45. It was about 90 degrees out when I added the refrigerant. Now all I need is a really hot day to really test it out. Thanks!

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