1986 911 AC recharge.

[86 911 Targa]

How many ounces of the PAG46 oil for a new
A/C compressor installation?

Stock 3.2 compressor-Please see jpg.

R134 refrigerant.

The hoses/condensers/evaporator have been flushed.

Thanks in advance,

Gerry

[wayne robson]

Gerry, i did mine about a year ago, just like you, new hoses, removed evaporator cleaned, and all condensers,rebuilt compressor, replaced dryer, etc, and i got instructions from Griff and with new hoses, all stock items,- fitted,
and used pag 46, i used 3 ozs, pre assembly , that is about half to i oz in those items before placing them back in car, which was 3 ozs, then i used another about 2 to 3 ozs mixed with the 134 gas when i charged the A/c.
The car A/C works great its wonderful, i did a forum back on here on 10-2-2017 about my A/C re rebuild. hope this helps.
Each recharge 18oz bottle has 3 oz of performance booster,oil,andleak seal.

[kuehl]

PM sent

[Nick Triesch]

Dang that is a pretty motor! What do you use on the black parts?

[Ctopher]

Originally Posted by Nick Triesch

Dang that is a pretty motor! What do you use on the black parts?

Not the original poster but can suggest using CarPro Dlux and/or Perl for your plastics and rubber. Here is a pic of mine, ironically working on the AC mock up this weekend. All the exterior were treated with Dlux and I’ve used Perl to maintain.

https://www.carpro-us.com/coatings-sealants-spray-wax/cquartz-dlux-wheel-trim-coating-30ml-sky-kit/

https://www.carpro-us.com/wheels-tires-and-trim-care/carpro-perl-1-liter-32oz/

[Rawknees'Turbo]

^^^

You will find that those supplemental condenser fans help quite a bit with initial cool down (including after parking lot heat soaks) and during slow speed (around town, running errands, etc) driving. I added one to my Turbo a couple of years ago, and even here in TexAss, where I see you are, it was well worth the effort.

Maybe you are already aware of this, but it is best to operate those fans off of a relay - draw power for the relay from the starter lug and then trigger the relay with the compressor clutch power wire. You can use one 15 amp, fused relay to run both fans, and also fuse each fan supply wire, after the relay, so that if one locks up, or begins to draw excessive current, it will not pop the relay fuse (the still-good fan will continue to run, in other words).

[kuehl]

Originally Posted by wayne robson

,and leak seal.

It all sounded good until I read "Leak Seal".

AVOID "stop leak, leak seal" and any other additives.
All you need is the right refrigerant oil to match the application and refrigerant, R12 or R134a.

[Ctopher]

Originally Posted by Rawknees'Turbo

^^^

You will find that those supplemental condenser fans help quite a bit with initial cool down (including after parking lot heat soaks) and during slow speed (around town, running errands, etc) driving. I added one to my Turbo a couple of years ago, and even here in TexAss, where I see you are, it was well worth the effort.

Maybe you are already aware of this, but it is best to operate those fans off of a relay - draw power for the relay from the starter lug and then trigger the relay with the compressor clutch power wire. You can use one 15 amp, fused relay to run both fans, and also fuse each fan supply wire, after the relay, so that if one locks up, or begins to draw excessive current, it will not pop the relay fuse (the still-good fan will continue to run, in other words).

That’s my hope as I can see the AC temps quickly start to lower as I get to highway speeds. Running the toll way at 100 is no issue it’s all the 30mph stop and go that kills me.

Thank you for the suggestion. I had intended to run a stock red relay in the engine fuse area on the left to handle the fan(s) which would be running off a trinary switch. Since this is all original equipment I was going to run off a discharge port so I did not have to run new lines, at least not now. Using this
https://nostalgicac.com/oil-flush-refrigerant-switches/ac-pressure-switch/binary-switch-w-r-134a-discharge-port-7-16.html

I was hesitant to run the fan just when the AC compresssor was running as I wouldn’t have control over the fans to keep running if the clutch disengaged and pressure was increasing. What has been your experience with running without a trinary for fan pressure control? I’ve also thought about adding a delay relay to keep fans running after ignition shutoff to help control pressures.

Thoughts?

[kuehl]

Originally Posted by Ctopher

it’s all the 30mph stop and go that kills me.

That's related to not just to condenser efficiencies, rather a function of engine RPM because you compressor is running slower.

Originally Posted by Ctopher

I’ve also thought about adding a delay relay to keep fans running after ignition shutoff to help control pressures.

As soon as the compressor clutch disengages the system high side pressure starts to drop.

[Ctopher]

Originally Posted by kuehl

That's related to not just to condenser efficiencies, rather a function of engine RPM because you compressor is running slower.



As soon as the compressor clutch disengages the system high side pressure starts to drop.

Kuehl,
Would you recommend to just run the relay off the compressor clutch then? And don't worry about fan start/stop with pressure or have a compressor low/high cutoff capabilities? I like KISS as I'm just trying to make due with what I have until next year or so before I buy your nice full AC setup with extra condenser. But at the same time don't want to risk damage if not needed. Plus what I do with the fans should be able to carry over to your setup, right?

Sorry for the thread highjack.

[Rawknees'Turbo]

Originally Posted by Ctopher

I was hesitant to run the fan just when the AC compresssor was running as I wouldn’t have control over the fans to keep running if the clutch disengaged and pressure was increasing. What has been your experience with running without a trinary for fan pressure control? I’ve also thought about adding a delay relay to keep fans running after ignition shutoff to help control pressures.

Thoughts?

As Griff said, and he knows a lot more than I do about a/c , the highside pressures drop as soon as the clutch is disengaged - no concern about overpressure building up and no real need to run the fans then (or after engine shutdown - the thing about condensers is they shed heat very quickly, so even if one gets very warm after shutdown, like in a store parting lot in the summer here, the cooling is very rapid once underway again).

I don't use a trinary switch - have considered it based on I like gadgetry, but my highly modified system works so well without one that I've never made the change.

[kuehl]

Hijacker,

We have our own philosophies on "fans" discussed in older threads, however:

Yes, kiss it: clutch engaged and power on fan, clutch disengages and power off fan. .

Clutch coil in theory sucks 4 amps and that's a long leg (voltage drop) from the thermostat, so don't run the fan directly off the power wire to clutch.

Create a "Y" splitter ( 16 gauge stranded tin coated, female spade to power wire by oil filter, and to male spades), one male spade to the clutch coil, the other male spade will go to relay. Mount a 20A common 5 pin SPDT 12v relay on the power panel relay fuse box in the engine bay (RH rear corner). Run relay ground 85 to body. Run a length of 16 awg wire from Y splitter around back of motor (up by the shock towers) to trigger terminal 86 on relay. Tap off one of the 2 fuses on existing power panel to terminal 30 on relay Come off powered-on terminal 87 with run of wire following same path back to the fans.

When you are ready to install Kuehl Fender Condenser(s) you can take the fans off the deck lid condenser (where they are blocking air flow) and use them as after burners for oversized intercoolers, maybe try to blow air through drilled rotors or gas slots, whatever floats the boat.