Question about 1998 Chevrolet S-10 Pickup

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1997 S-10 AC system works but no cold air in cab

I have a 1997 S-10. The AC compressor is working, is at normal/max charge, and the blower motor is working. Air is getting into the cab through the A'C dash vents but is only BARELY cool. Barely. I switched it from cold to hot on the temperature dial to make sure the airbox doors were working properly and they did seal off and you could tell the difference. I did the same with going from A/C to heat to defrost and all of those changed as they should have. The A/C line coming from the compressor into the firewall A/C evaporator housing is extremely cold also so I know it's circulating and the orifice tube is not plugged. What the heck is causing the lack of cold air into the cab?

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The only thing I can think of is the air blend door, while moving, isn't closing.

Posted on Jul 20, 2009

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Probaly low on freon

Posted on Jul 19, 2009


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You may not have enough R134a in the system, or you have over charged the system and your high pressure switch is turning your compressor off when the pressure get's to high.
You really need a A/C gauge set to see of your system is over or under charge. If it's under charge, that's good. A over charged system will cause your a costly repair of replacing a $300.00 rebuilt compressor plus the vacuuming out the system and replacing the accumulator which may have parts from the compressor (bearing).
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Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s – Ranges from 25-35 PSI – Note that on many Chrysler products a normal reading on the low side may be 15-25 PSI
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Don’t assume that if adding little Freon is good that adding a lot is better! Overcharging just a little can decrease the performance of the system and possibly damage the compressor, assuming the blower speed is on high, AC is set on maximum and engine is around 2,000 RPM’s

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5. Notice if compressor clutch is cylcling excessively.

Thank you for using fixya and good luck

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