Automotive Air Conditioning Information Forum (Archives)

Eastoahu on Fri May 29, 2015 11:57 PM

Year: 1991
Make: Nissan
Model: 240sx
Engine Size: 2.4L
Refrigerant Type: r134a
Country of Origin: United States

So i recently finished the r134a conversion, AC is blowing pretty cold getting to 40 degrees.. I changed the expansion valve also. I'm getting a noise when starting the AC and when revving the engine over 2-3k.. Sounds like a high pitch trumpet or something lol. I will attach a video below to give you a better idea. Pretty sure its expansion valve? Maybe the pressures are getting to high?

http://youtu.be/IVDnIeF4kjk
Video Link

thanks guys.

Edited: Fri May 29, 2015 at 11:59 PM by Eastoahu

TRB on Sat May 30, 2015 11:04 AM

In the past I have seen this on a run of bad valves. They work fine but make noise. Might try a different manufacture on the valve.

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