2001 Buick Century Logo
Posted on Nov 18, 2012
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Ac problems when ac is on blows cold but compressor stays engaged all the time high side reading low it from 100 up to 200 then then back down to 100

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allobd2

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  • Buick Master 1,207 Answers
  • Posted on Nov 19, 2012
allobd2
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Joined: May 24, 2012
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Multi-Diag Access J2534 has the function for air condition, such as Diagnosis of cooling electronic,
Reading settings cooling circuit,Test servo actuators
http://www.careucar.com/wholesale/[email protected]

4 Related Answers

Ed Mac

  • 731 Answers
  • Posted on Apr 04, 2010

SOURCE: My AC blows hot air out the driver's side and cold

My 02 Century has dual temp controls . One for driver for passenger. Make sure you don't have the dual climate enabled and just set for heat on your side and AC on the passengers

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Anonymous

  • 131 Answers
  • Posted on Jun 29, 2011

SOURCE: on 2002 buick regal ac problems. Tried a jumper

Does the system have a leak? If it does, then the computer might have set a low freon code that usually does not turn on the check engine light by itself. If this occurs, the code will have to be erased before the compressor will run. The computer does this in order to protect the compressor so that it cannot run without enough freon in the system. Once you correct the amount of freon in the system (if it needs it), reset the system and see if the compressor will run. Some parts stores have the ability to erase codes and will usually do it for free. I hope this solves your problem. It's definitely not good to have AC problems this time of year. Thanks for trying Fixya.com.

thisctop

Curtis Robinson

  • 120 Answers
  • Posted on Nov 23, 2011

SOURCE: compressor keeps kicking off 1999 Buick Century AC

Your ac system is most likely low on freon, or the cooling fan is not working.
When you turn on the ac the cooling fan should stay on.
If it stays on then you are low on freon.

skychief2001

Stephen

  • 21873 Answers
  • Posted on Aug 28, 2012

SOURCE: how many gaskets go behind ac compressor attaching low/high side hoses? And how much torque does the one bolt on hose block get torqued to?

Should be one oring or gasket on each line - the bolt is probably 20 or 30 ft lbs, enough to be tight without stripping it much like an engine bracket.

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You've got some of the picture, but not all of it.
You need to know what the high and low side readings are, so yes you do need the gauge set. If the system is charged, and the low side is not dropping below 25psi, I would guess the low side pressure switch is faulty. But if the low side is dropping below 20psi when the compressor stops, the system may be low on freon. Which means you have a leak somewhere.
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I have a 2001 Ford Mustang V6, the ac is blowing warm air. We checked the refrigerant and it is full. The ac compressor will kick on for a few seconds and then kick off. Why is the compressor not staying...
it's either low (in spite of your readings) or your a/c clutch is not working correctly or you have too big an air gap in the clutch.
First, just disconnect the 2 pin connector from the a/c pressure cycling swithc and jumper the 2 pins with a wire to force the clutch to stay engaged. See if it blows cold then, and stays engaged. You can run this way for about 15 minutes before you have to pull the plug.
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AC comes on, then shuts down before car is cooled. Compressor activates and blows cool air for about 15 seconds then shuts down.
Low on R134a, you need to have the system recharged. Try to stay away from the do it your self kit that most Auto Parts store carry.
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.

Thank you for using fixya and good luck.

http://www.freeautomechanic.com/airconditioning.html
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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

BOTH readings should be checked to have a better idea of what is going on with an AC system but based on the limited information… the compressor is not engaged or is not pumping. Below are some things I would check;


1. Check the high and low gauge readings with the AC on & set on MAX/Recirculate, middle vents with the engine at 2,000 RPM’s, blower speed on high.


2. Check the vent temperatures with a thermometer from the middle vents, far right & far left vents?


3. What is the outside temperature at the time the readings were taken?


4. Check to see if the condenser fan blowing strong?


5. Notice if compressor clutch is cylcling excessively.


Thank you for using fixya and be safe
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