Question about 1997 Chevrolet S-10 Pickup

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1997 s10 pick up ac it works fine when sitting

1997 s10 pick up ac it works fine when sitting still but when moving doesnt work as well

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  • terry899 Jun 01, 2010

    the ac had a small leak where you hook the hoses replaced the it looks like a value put under pressure seemed ok could it be to much freon

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  • Chevrolet Master
  • 3,854 Answers

Your going to need a gauge to see your reading from your hi and low side pressure from your A/C system.
Below are normal car AC pressure readings with 134A.

  • Normal readings on high and low side with AC OFF (static pressure) – Depends on outside temperature, but normally is between 80-105 PSI
  • Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s – Ranges from 25-35 PSI
  • Normal high side reading ranges from 200-350 PSI
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.

1. Both low and high side readings are lower than normal, this indicates a cars AC system is low on refrigerant and is under-charged.

2. If both low and high side readings are too high, this indicates an overcharged system – too much refrigerant. This also can indicate that the condenser fan is not working, is too slow or the car is overheating and heat is transferring from the radiator to the condenser.

3. When the low side goes so low that it’s reading shows it is in a vacuum, the most likely cause is a bad expansion valve or blocked orifice tube. Another possibility is a restricted condenser. Blocked condensers are not as common as they used to be but if a compressor fails and comes apart inside the remnants can end up in the condenser causing it to restrict the flow of refrigerant.

4. When the compressor clutch is definitely engaged and the low side is high and the high side is low, the most likely cause is that the compressor is failing – it is not pumping sufficiently. Rarely an AC clutch could be slipping but usually this will be accompanied with a squeal or chip.

The line going from the compressor to the condenser is the discharge line – it is normal for it to be very hot to the touch. The other line going from the drier or accumulator to the compressor is normally colder. The liquid line can be hot up to the point an orifice tube is in place. Just remember that LOW Pressure = COLD and HIGH Pressure = HOT.


Thank you for using fixya and be safe.

Posted on Jun 01, 2010

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  • Chevrolet Master
  • 6,826 Answers

Have someone put some ac gauges on the ac system,it is either low on freon,or the orifice tube is restricted,most likely low,the ac compressor on that model is prone to leak.

Posted on Jun 01, 2010

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jun 01, 2010

    This system only holds about 2- 12 oz cans of freon,and maybe just a tad more,ac gauges will tell more about the ac system,and what exactly is going on,but believe me,the ac compressor is more than likely leaking,it is real common for these ac compressors.It is more than likely low on freon,but like I said,ac gauges will tell the story.

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