Thread: a/c problem
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Old 06-14-2018, 08:20 PM   #9
fdryer
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Join Date: Jan 2006
Location: NYC
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2003 L-Series 3.0L Sedan
Default Re: a/c problem

1-How many cooling fans and are any running when ac is on?

2-Is vent air flow diminished or not?

3-Did you use a uv blacklight to search for dye leaks?

Technically, when low side pressure shows 25 psi the vents should be blowing freezing air but when revving engine to 2k rpm with low side pressure of 5 psi, the evaporator should be freezing at close to 0F or the hvac box becomes a solid block of ice as moisture freezes across the coils.

Fluorescent dye is mixed with oil and circulates permanently in GM ac systems, making leak detection easier. According to your gauge pressures, a leak doesn't seem likely due to correct high pressures. A leak will result in much lower high pressures.

A few things may be considered - compressor scroll valve issues and cooling fan(s) not running. Vue compressor scroll valve issues; http://www.saturnfans.com/forums/sho...d.php?t=191521

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