Question about Chevrolet G20
Posted by Anonymous on
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Posted on Jan 02, 2017
If it is above 100PSI, you are over charged. Any thing under, should be normal to low. You probably need to get it checked by a professional to make sure it has the correct charge, and the compressor is getting power when the switch is turned on.
Posted on Jul 14, 2009
You may have created an over charged condition and at this point the a/c compressor will cut off on high head pressures. This can be verified by installing gauges to the systems high and low side service taps and reading the pressures.An overcharged system will start the compressor briefly but soon cuts off once pressure goes to 350 - 400 lbs on the high side. Acceptable pressures for this system should be no greater than 250 high and low suction should drop to 40-50 psi.You might recover the charge and evacuate the system,then try bringing the charge back to proper level.A sight glass in the reciever drier really helps determining proper fill.Once all bubbles have dissipated from the sight glass during charging ,one should stop at that point to avoid overfilling.Too much freon is worse than a low charge especially in hot ambient conditions....
Posted on Aug 27, 2009
You may not be full of refrigerant... There is a low pressure switch that prevents the AC from actuating the clutch, and the reason is: IF there is not enough refrigerant, you will not be able to move oil through the system and you will have major damage...so no engauge...
Get the system checked, most likely there is a leak somewhere..
Posted on Sep 20, 2009
The refrigeration system in all vehicles should be repaired by a certified HVAC technician or equilavent. Dealing with R134A the refrigerant used in your vehicle is dangerous. The electrical checks to determine the repair are difficult and depending on what the problem is are costly and may involve removing the refrigerant with special machinery
to replace a sensor or major item in the system.
Lastly in most states its illegal to purchase refrigerants and /or render repairs on a/c systems without the proper certifications.
In your case it appears that the blend doors or blower motors are not working because you stated in your write up that compressor is on and refrigerant is a-ok.
Have a technician check this out. May have to remove dash board to do testing. This is money well spent.
Posted on Apr 09, 2010
when the ac doesnt blow cold and the compressor pump doesnt click on ,this can only be done with the proper machine to remove the gas and weigh how much was taken out ,then oil recovery and a vacumn then recharge with the corerect weight of gas .
Posted on May 27, 2010
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