A/C question for R22Tech or other experts

[Rod Walter]

Can anyone tell me what the high and low side pressure readings should be for my A/C? Car is an '88 coupe with the original system (Nippondenso compressor) if it makes a difference. I'm not experiencing any problems now - knock on wood - but when I eventually have to recharge the system I want to do it correctly. And, yes, I have a section 609 license to buy R-12. Why do I feel like the refrigerant market must be like the crack market

------------------
Rod Walter
'88 911 coupe

[derkpitt]

Hey i'm no expert, but I am working on my 88 a/c sys right now. With the advice of r22tech, he said, and this is no quote, the high side should be around the 150psi range.
And the low side around 30psi.

------------------
Derk Pitt
88 Carrera Coupe

[Rod Walter]

Thanks, Derk, for your reply! Hey, what's an AMT?

(A dope slap to the side of my own head!!!) I just looked in the Bentley manual again and found the specs:

at 25 degrees C. ambient and 2000 rpm

Low side....12 - 30 psi
High side...115 - 205 psi

in the event that anyone else has a need to know.


------------------
Rod Walter
'88 911 coupe

[This message has been edited by Rod Walter (edited 07-15-2001).]

[R22tech]

Those figures are correct-I charge mine with the RPM around 2700 though. 30/150 ave. psi

NOTE: Always charge and check pressure with the decklid CLOSED, in case you forgot.

[Joeaksa]

Rod,

An AMT may be an Aviation Maintenance Tech... aircraft mechanic. Did it for many years...

JA

[derkpitt]

You are correct, Sir!

------------------
Derk Pitt
88 Carrera Coupe

[R22tech]

Hey, Derk. How's the a/c doing? Just wanted to thank you for the sleeve/duct. It worked like a charm and now I have much more air velocity coming into the cabin!

[Rod Walter]

Thanks, Joe and R22tech, for the info. I won't forget to close the decklid (I hope).

Derk, working on the 911 must seem like a piece of cake considering the tolerances and records required for aircraft.

Joe, why did you leave that career? I understand that there is a shortage of good people in that line of work.

------------------
Rod Walter
'88 911 coupe

[derkpitt]

Well this is my first Porsche. And it's a little different. I finally got a new dryer.
But the truck's at the body shop getting a little sheet metal [opps]. Should have it back tomorrow. Maybe this weekend I'll put in the dryer and vacuum it down, [all day].

------------------
Derk Pitt
88 Carrera Coupe

[Joeaksa]

Rod,

Was forced, kicking and screaming out of doing aircraft maintenance! Some jerk forced me into the right seat of the airplane and told me I was now a copilot. That was in 1983 and now for some reason people think that I can fly the things!

You are totally correct. If you know of anyone who wants a good career, aviation maintainence and repair is a very good field, especially if you are either computer or electronics friendly. Home every night and its a very good job. Salaries are coming up as there is a extreme shortage of experienced people in the field now.

I was an teacher and examiner with AMT's for a while and may go back into this area when I get tired of staying in hotel rooms all the time! I still restore old fabric airplanes for a hobby just to keep my sanity.

Take care,

Joe

[Joeaksa]

Derk,

Pls let me know if you see a real difference with the new dryer in the system. I have a new one stashed in the garage that I was going to save for when I switch over to R134 and am curious...

JA

[derkpitt]

Wow, a mechanic friendly pilot, great to meet one of those.
After looking in to the A/C sys on 911's.
I see know reason that the air shouldn't be as cold or even colder than other cars [ricers].
I'll let you know how it works out.

------------------
Derk Pitt
88 Carrera Coupe