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Total failure in AC revival attempt

I dont know what the problem is. I tried to inject an oil & freon charge into the low pressure side. The cheapo guage, trigger & hose that came with a larger 18oz 134a bottle that I bought at Target had a plastic reciever that wouldnt fit onto the center nipple of the dual guage manifold set, so I connected it directly to the low side and pulled the trigger. A very little amount seems to have gone into the system. The little 134a/PAG oil charge seems to have lost only a bit of its content (wieghs almost as much as before) even though the dial showed nearly 80psi. I reconnected the low side connection to the manifold and it seems to read about 45psi.

This was all done with the engine running and at no time did the compressor engage. The high side guage did not budge off of ZERO. (Darn my luck)

Basic deduction seems to point to a blockage which didnt exist prior to applying vacuum. Perhaps applying a charge has only pressurized the low pressure hose and nothing else.

On the Saturn system, what is on the other end of the low pressure hose opposite the compressor? Might the oft mentioned used accumulator be blocked?

Perhaps a small amount of nitrited plastique detonated by a small electric cap could resolve this problem permanently?

-Thanks, WaVy

Reply to
wavy
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Since a "cheapo" gage reads only low side pressure and the low side and high side have different couplers I am not sure what you are reading here. ALso, I have never seen a system that has pressure on low side on none on high side as they are connected together and will read the same unless compressor is running and in which case the high side will generally read 5 to 8 time more presure than low side. (exact amount depends on system and other varibles)

----------------- The SnoMan

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Reply to
SnoMan

If the compressor isn't engaging, it's not surprising that you're not able to charge the system. Have you checked the relevant fuses and the fan relay for the cooling fan(s)? Have you tried manually engaging the clutch to make sure the clutch is working?

Cheers,

Reply to
Ritz

"Manually" engaging the compressor might be a good idea. I'll have to try that.

But I still am puzzled to how pressure applied to the low side did not get around to the high side. (Yeah - I did have the high side of the nice, new expensive dual guage 134a manifold testing unit attached the whole time).

Just to make it clear to everyone, I didnt just rely on the cheapo guage with the hose that came from Target with the $20 recharge kit. But it seems to me that I only managed to pressurize a small part of the system - that is - the low side _hose_ ONLY, since I reconnected the blue, low side of the nice, new expensive dual guage 134a manifold testing unit and it indicated less pressure than the little recharge kit guage. (which has a rather long hose where some of that pressure would be lost).

I'm thinking that the whole time I may have only pulled a vacuum on the low side of the system - that there is a hideous amount of blockage in the system....

-Thanks, WaV

======================== Worst President Ever ======================= Ritz wrote:

Reply to
wavy

Well sure. That's the way its SUPPOSED to work. Which, unfortunately is not what I'm experiencing.....

-WaV

SnoMan wrote:

Reply to
wavy

You might swap lines around on gage to confirm that the high side is working.

----------------- The SnoMan

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Reply to
SnoMan

It's not going to "inhale" much freon at all if you don't get the compressor to engage. It's certainly possible that you've got a blocked reed valve or some other blockage, but I suspect that once you jump the compressor and get it to start taking a 134a charge, you'll start to see a pressure differential between the low/high sides.

Reply to
Ritz

The pressure should be equalized in the system when the compressor is not engaged. I simply do not believe that you could have sufficient blockage to have "zero pressure" on the high side. My guess here is that you have not opened the high pressure valve on the "fancy gauge set" you purchased. The trick here is that with most of these sets, those valves open when fully turned to the clockwise position - this is contrary to most clockwise closed valves. (Note that this fully extends the depressor onto the Schrader valve on the quick disconnect.)

To add refrigerant, you need to then manually activate the compressor by bypassing the pressure switch. I usually use a paper clip to accomplish this if refrigerant is too low.

Good luck and hope this is your issue and you get the AC fixed. Let us know.

Bob

Reply to
Bob Shuman

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