I had a 2007 Ford Expedition (still under factory warranty) that I had an earlier thread about.
I had talked about the poor performance of the AC. I have an inexpensive, low side pressure gauge (the kind you can screw a can of R-134 in) I wasn't planning on adding anything in, I wanted to see what the pressure was.
When I opened the cap to the service port, I saw a small amount of oil bubbling out of the port. It was a small amount, but clearly gas was escaping. Here is the puzzling part, the low side pressure reading was around 100 lbs, well into the "danger" zone of the gauge. The car had not been started for the day.
I'm a novice when it comes to AC stuff on autos, but everything seems really screwed up. Fortunately, this car is under warranty. Did the Ford dealer way overcharge the system?
Leaking out the valve can be a problem, especially if the cap doesn't make a good seal.
Static pressure (system not running) should be like 100 psi. When the AC is running, the low side is under 50 psi.
I wouldn't trust anything except a decent set of high/low gauges.
You only observe the readings on the death kit gages when the compressor is running..............your compressor was off- otherwise known as static pressure.
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......
I trust those kit gauges as much as I trust our government, except the kit gauges I can test and prove they are not very good. But you were inaccurately testing static pressure that should be at least that high. And that static pressure doesn't tell you or anybody else on this board, nothing, except your system is not bone dry.
Yes, R-134a ports are a pain in the butt, complain to the EPA about this, they approved them.
Just a quick observation, the caps are the primary seal for your ac system, make sure you have good caps when you recharge the system..make sure the rubber gaskets are in them...
Freedoms just another word for nothing left to lose
Would you call these new plastic caps, a good cap? EPA jumps all over about refrigerant leaks, but the new stuff they use is all crap. Finger tightened on cap and it got a huge crack along the side, that never happened with metal. Now afraid to even hand tighten them, that red cap on the high side that get hot and the plastic that gets brittle. Who in the hell ever approved of this?
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