A/C Question

On my 98 Riviera needed a new schrader valve for the high pressure, my mechanic sent me to the GM dealer for it as he said Advanced Auto parts shraders not good. Dealer gave me a funny look and showed me the diagram on his computer that both valves on the same line the high pressure line and does not show any on the low pressure. My mechanic said this is the first time he saw a car with both valves on the same line. What gives?

It would be impossible to charge the system without a valve on the low side.

They are both on the same line, parts dept guy thought it was very strange also when he looked into the diagram on the computer, both the high and low valves are on the same line.

Not only basic logic but understanding how the system functions tells you this is not possible.

[quote="pbrktrt"]Not only basic logic but understanding how the system functions tells you this is not possible. [/quote


It is like that and the dealers diagram showed the same, if you can take a look at yours. Tried to attach picture.

It's not on the same line. #4 is the high side service port, #12 is the low side service port.

Thank you Larry, I was getting nowhere. My computer skills suck.

I took a picture of what I was talking about on the passenger side of the engine compartment, just do not know how to post it here.

steve2150 wrote:

I took a picture of what I was talking about on the passenger side of the engine compartment, just do not know how to post it here.

Do you know how to e-mail the picture to me? [address removed]

To email Larry, press ^ ^ ^

Steve, if you want to send Larry a message, you can do so by clicking on the "email" button above, at the bottom of your post.

Larry, I removed your email address from the post, to protect your identity.

sent Larry the picture to his email address.

AA wrote:

To email Larry, press ^ ^ ^

Steve, if you want to send Larry a message, you can do so by clicking on the "email" button above, at the bottom of your post.

Larry, I removed your email address from the post, to protect your identity.

I understand Aaron, but will he be able to attach a picture if he e-mails me through the board?

steve2150 wrote:

sent Larry the picture to his email address.

Didn't get it.

I tried sending again to the original email you posted, hope you got it this time.

Quote :

I understand Aaron, but will he be able to attach a picture if he e-mails me through the board?

No, but at least you can communicate privately. For example, he could mail you his email address, then you can email him yours, then he can attach an image to a direct mail.

Another thing you could do is send him your email address through a PM.

Posting your email address in a forum thread is kind of like putting your phone number on a billboard sign. You might get some strange phone calls!

Got it.

That's the same way mine is

Last weekend I tried to recharge the system but the A/C compressor was not kicking but the can gets really cold

The diagram at the Chevy dealer parts dept shows the same as the picture, my mechanic and the parts go both said how can they be both on the high side.

yes ,the same here!

So why are both valves on the high side, my mechanic said no wonder it takes so long to charge the ac

Does anyone have the answer why both valves are on the high side only and no valve on the low side

The low pressure valve is the smaller one (closer to the firewall).

I added a can of R134 (bought the NAPA recharge kit) through the small port this spring, and the system blew 40-45 degree air all summer. This was the first time I'd played with R134 (I'd only had experience with R12 before), and was pleasantly surprised at how they had made it "dummy proof" by making the low pressure port smaller than the high pressure port.

By the way, Big Lots sells R134 cans for $8 (I believe that they are 12 oz)

Yes but the low and high pressure ports are on the same line, that is the question, how can they both be on the same line.

I believe it is possible for the high and low valves to be on the same line - if there is some kind of metering device inside, between the valves, to adjust the pressure. With the system running, touch the line near the large valve (high side). It should be warm. Compare by touching the line near the smaller valve (low side). It should be cold.

Those crazy GM engineers and their clever fluid dynamics solutions!