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How to get A/C to cool better '95 STS?

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I recently bought a 1995 Seville STS w/ climate control. I'm noticing that the A/C blows cold air at an RPM range more than 1500. However, at stoplights or in idle (<1500RPM), I notice it just blows outside air in (which in summer is like having a heater on). Just wondering if this is normal for an older vehicle like this or if there is a way to boost the cold air or make it more efficient. (R134A level seems to be okay). Thanks.
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Ranger
Check to be sure that the cooling fans are on. They should run anytime that the A/C is on. Also check to see that the condenser is not clogged with dead bugs. You might try flushing it out anyway.
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