AC Pro's ... I'm in need some help here
The A/C on my '87 cord hasn't been working for >1 year, and I'm finally getting around to tackling it. To my knowledge, I'm still running the original R-12 setup. I've done quite a bit of searching on the forums and know (for the most part) what I need to do, but I still have some questions. I am a 4th year chemical engineering student so technical explanations are welcomed
Here's what I know:
-When I press the A/C button, the air temp does not change at all. After some investigation I found that it's because the system is not engaging.
-This could very well be b/c I'm too low on coolant, and the LOW PRESSURE SWITCH is preventing powering of the compressor so it's not running dry and burning up. Can anyone interpret anything from the pic below?
-Last night I tried to bypass the PSL and get the compressor to engage so at least I could rule out that my compressor is dead. However I'm pretty bad when it comes to electrical, so maybe my method was wrong. I simply tried turning the car on, pushing the A/C button with the fan on low, and using needle nose pliers to hold a metal nail against the two contacts (to complete the circuit?) on the pressure switch. Nothing happened.
First off, I want to make sure I'm doing this correctly. The PSL is the object shown in the pic below, right?
I've read about how to short this, but people never say anything beyond very simple instructions like "bypass the low pressure switch" or "apply a voltage across the two leads." Basically just at this point, I need to better understand how EXACTLY I test for my pump's functionality. After I establish that, I can move forward.
Anyone?
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