Originally Posted by jeepsrtoys
Ok, I am going to highjack this thread. So I have been looking through a couple A/C problem threads. I have a issue with mine. though I haven't added any Freon.
3. when the compressor engages the system drops to almost 0 psi....
I don't completely understand the function of how a/c systems work.. but I would assume there is a blockage somewhere in the system.
I also would assume I need to check the psi on the high side and see if it goes up when the compressor engages.. ? or...?
You are measuring LOW SIDE pressures, also known as "Suction pressures". The fact that it goes to zero when the compressor kicks on indicates a low charge of refrigerant.
Since you are not experienced with AC systems, here is what I recommend for a low-cost/high-effectiveness solution:
1. take the vehicle to a COMPETENT AC shop. Have them diagnose the problem. They may need to add refrigerant to complete diagnosis.
2. Once they tell you what is wrong, repair/replace the defective parts yourself.
3. Once you have replaced the defective parts, take the vehicle back to the same shop, tell them what you did, and have them evacuate and recharge the unit.
It might help if you do some research on auto AC systems, such as: