Question-------------------------
Followup To
Question -
The ac compressor on my Blazer will not cycle. Here is a list of what I have checked:
1. The system is charged and has around 35 psi on the low side.
2. There is voltage to the switch on the accumulator.
3. Arcing across the two terminals in the plug going to the switch will cause the compressor clutch to engage.
4. Replacing the switch did not help.
Is there anything else that I can check or is it time to resort to professional help?
I thank you for any help.
Answer -
You stated that you have 35lbs of LOW side pressure. Is this with the compressor ON or OFF ?.
What was the cause that made the A/C stop working ?.
What EXACTLY and by what method did you recharge the system if you did recharge it.
Tell me everything you did.
You still have other possible problems:
1. A new faulty pressure cycling switch on the accumulator.
2. Low freon charge or charged INCORRECTLY.
3. A restricted orfice tube.
4. broken/cracked REED valves in the compressor.
3. What do the HIGH and LOW side pressures read on the A/C gages ?.
FOLLOW UP INFORMATION
First I would like to thank you for the very prompt reply to my first question.
To answer your questions:
The pressure reading was with the compressor off.
This is a vehicle that I bought in the winter and the ac simply did not work when I tried to use it recently.
I did not try to recharge it after I saw that the pressure wasin the range that it is.
I am afraid that I cannot give you the high side reading. I don't have a complete manifold set only a do-it-yourself-er recharge guage.
I have nothing to compare this observation to but it didn't seem like there was much pressure behind the cycling switch when I took it off the accumulator.
Thank you once again.
AnswerThere is your roblem. with the compressor OFF you should be showing equal pressures of the LOW and HIGH sides and it should read about 100 lbs on BOTH high and LOW sides.
1. Evacuate the system via a vacuum pump and recharge the sytsem with the correct amonut of freon.
The pressure on the LOW side with the A/C running should show about 45 lbs and gradualy go down to approx 25 before the compressor disengages.
You CAN use the jumper in the pressure cycling switch but do NOT exced letting the compressor run for moer tahn 2 or 3 minutes using this jumper method.
What most likely ahppened is that the previous owner had a leak, fixed the laek and did NOT use a vacuum pump or leak detector to make sure that the laek was fixed and simply installed freon in the system along with the atmospheric air that was alsready in the syatem.
You MUST use a vacuum pump to evacuate the atmospheric air from the system BEFORE you add the freon.
This is in my professional opinion your problem.
I can provide you with all of the necessary information vis e-mail to fix your system as it is quite simple.
You will need to contact me at:
onlineautohelp@msn.com
In order for me to send you the information, and pictures related to your problem.
This website is NOT mine and I am only a VOLUNTEER helping answer BASIC simple questions to those in need and this website does not allow pictures to be sent and or received.
Please include all of the information, MAKE, YEAR, MODEL, Engine size, and all necessary other information that you previously provided as well as the information that I just gave you when you contact me.
I will get back to you in the morning.
autohelp
