R-12 to R-134a parts.

[Nick Triesch]

I just bought a retrofit valve conversion kit for my 3.2. I installed the low side no problem but the high side valve on the Nippondenso is the same thread size as the low side.. So do I just get another kit and install the same valve as the low side and make a note which side is the low side for filling? Thanks, Nick

[Nick Triesch]

Sorry, going from R-12 to 134-a.

[T77911S]

that won't work because the r134 quick connects are 2 different sizes.
you could do it if you got an extra low side hose so you used 2 low side hoses, just be careful when connecting

wait til you try to use an old r12 type vacuum pump with 134 gauges. i searched 2 towns to find an adapter.


some cars had a hi side that was even smaller and you needed another adapter to size it up.

[Nick Triesch]

I guess I just need to find the right adapter for the high side.

[Hunt3R]

I just bought a cheap adapter kit today from Autozone that had 1 low side adapter and what appeared to be 2 different high side adapters, although I only attached the low side to fill the Freon it looked like the high's would've fit fine on my Denso compressor.

[wwest]

You should have a PRO do the initial conversion.

You need this...

Binary Switch w/ R-134a Discharge Port 7/16" - A/C Pressure Switch

Throw away (Ebay, Craigslist) the binary pressure sensor and use this one..

Male Trinary Safety Switch For Electric Fans - A/C Pressure Switch

To control and protect your compressor, and run this new fan..



Supply power to the trinary switch fan control element 24/7

[Nick Triesch]

wwest, all I need is the hi side R 134a connector adapter for my Nippondenso unit. My A/C works great. The adapter kit I bought from Pep Boy's high side adapter did not fit. Low side adapter works great!

[T77911S]

that fan looks interesting, where did you get it?

[tobluforu]

Pretty sure it's a spal which are great fans.

[kuehl]

Nick,
When you shop for your R134a adapters its best to use the type that have their own schrader valve inside (you remove the the schrader valve from the R12 service port and screw the the R134a adapter onto it). The less expensive R134a adapters simply have a pin which is suppose to push down on the R12 service ports schrader valve. This less expensive design tends to have issues; fails to engage the pin or gets stuck.

[wwest]

Originally Posted by Nick Triesch

wwest, all I need is the hi side R 134a connector adapter for my Nippondenso unit. My A/C works great. The adapter kit I bought from Pep Boy's high side adapter did not fit. Low side adapter works great!

"..my A/C works great..."

For the moment....

Buy a little insurance.

In case of refrigerant leakage the switch's low cutout will prevent compressor damage.

You're converting to a refrigerant that operates more optimally at high system pressures, the switch's high side cutout will prevent the compressor from over-pressurizing the system in the event of a (common) thermostatic control switch failure or malajustment.

The extra trinary function is typically used to power the, a fan, fans...

Why...

1. Not powering the fan(s) until the high side pressure reaches a more optimal level increases the system efficiency, possibly making up for the cooling capacity lost in the conversion to R-134a.

2. The single MAJOR shortcoming of the factory design is the poor refrigerant condensing capability during periods of extended low RPM engine operation. Adding the fan as shown, or even just powering the front lip condensor fan with the new switch might help to overcome the factory design shortcoming.

3. It is well known that our Porsche's suffer from refrigerant leakage over the long term. Seemingly, 2 years is typical for the US norhern reaches, 6 months in the hot and humid mid-south. What the cause for this leakage has been long though, assumed, to be our legacy "non-barrier" hoses, statements by the EPA, SAE, and DuPont, seem to put the "lie" to this.

In consideration of that information it might be wise to adjust our thinking to the possibility that other parameters, parameters other than simply the legacy non-barrier hoses, might be in play. Possibly parameters UNIQUE to our air-cooled engine cars with the primary refrigerant condensing capability mounted directly over a HOT, HEAT-SOAKED, engine and exhaust.

Ford prevents extreme pressure excusions, beyond 250 PSI, of R-134a via a "vent-to-atmosphere" suction side (SUCTION SIDE..??!!) pressure relief valve. Historically even with R-12, pressure excursions above 350 PSI, or even as high as 450 PSI, were prevented the same way, "vent-to-atmosphere" BOVs.

So, all those FACTS considered, what pressure level might our "unchecked" systems rise to post R-134a conversion given the location of the primary refrigerant condensing "container".

Beyond 450 PSI, possibly well beyond, could, SHOULD, be assumed.

An "after-run" cooling fan capability might well alleviate our historical refrigerant leakage problem, even if only the front lip condensor fan is used.

[kuehl]

Originally Posted by wwest

"..my A/C works great..."

Why...

1. Not powering the fan(s) until the high side pressure reaches a more optimal level increases the system efficiency, possibly making up for the cooling capacity lost in the conversion to R-134a. This has got to be the craziest notion
for MAC systems you have dreamed up yet, lol.

2. The single MAJOR shortcoming of the factory design is the poor refrigerant condensing capability during periods of extended low RPM engine operation. Adding the fan as shown, or even just powering the front lip condensor fan with the new switch might help to overcome the factory design shortcoming. Another wacky notion that could reduce air flow to to the engine, lol.

3. It is well known that our Porsche's suffer from refrigerant leakage over the long term. Seemingly, 2 years is typical for the US norhern reaches, 6 months in the hot and humid mid-south. What the cause for this leakage has been long though, assumed, to be our legacy "non-barrier" hoses, statements by the EPA, SAE, and DuPont, seem to put the "lie" to this. Amazing how someone with no Porsche AC experience nor AC design and test experience so easily calls professionals names.

In consideration of that information it might be wise to adjust our (don't include us) thinking to the possibility that other parameters, parameters other than simply the legacy non-barrier hoses, might be in play. Possibly parameters UNIQUE to our air-cooled engine cars with the primary refrigerant condensing capability mounted directly over a HOT, HEAT-SOAKED, engine and exhaust.
A yet to be proven hypothesis, lol.

Ford prevents extreme pressure excusions, beyond 250 PSI, of R-134a via a "vent-to-atmosphere" suction side (SUCTION SIDE..??!!) pressure relief valve, which you won't find on a Porsche in this forum. Historically even with R-12, pressure excursions above 350 PSI, or even as high as 450 PSI, were prevented the same way, "vent-to-atmosphere" BOVs. Although there is no evidence
of when the pressure could blow off or Porsche's blow off spec.

So, all those FACTS (myths) considered, what pressure level might our "unchecked" systems rise to post R-134a conversion given the location of the primary refrigerant condensing "container".

Beyond 450 PSI, possibly well beyond, could, SHOULD, be assumed. Heck, why not 800 psi!

An "after-run" cooling fan capability might well alleviate our historical refrigerant leakage problem, even if only the front lip condensor fan is used. Although such a concept has yet be proven to have any benefit

Very strange stuff

[Nick Triesch]

Kuehl, thanks for that adapter info. wwest,, I just need the adapter. You don't know my situation. Thanks anyway. Nick

[brads911sc]

What question for the original PO were you trying to answer.

LOL

Originally Posted by wwest

"..my A/C works great..."

For the moment....

Buy a little insurance.

In case of refrigerant leakage the switch's low cutout will prevent compressor damage.

You're converting to a refrigerant that operates more optimally at high system pressures, the switch's high side cutout will prevent the compressor from over-pressurizing the system in the event of a (common) thermostatic control switch failure or malajustment.

The extra trinary function is typically used to power the, a fan, fans...

Why...

1. Not powering the fan(s) until the high side pressure reaches a more optimal level increases the system efficiency, possibly making up for the cooling capacity lost in the conversion to R-134a.

2. The single MAJOR shortcoming of the factory design is the poor refrigerant condensing capability during periods of extended low RPM engine operation. Adding the fan as shown, or even just powering the front lip condensor fan with the new switch might help to overcome the factory design shortcoming.

3. It is well known that our Porsche's suffer from refrigerant leakage over the long term. Seemingly, 2 years is typical for the US norhern reaches, 6 months in the hot and humid mid-south. What the cause for this leakage has been long though, assumed, to be our legacy "non-barrier" hoses, statements by the EPA, SAE, and DuPont, seem to put the "lie" to this.

In consideration of that information it might be wise to adjust our thinking to the possibility that other parameters, parameters other than simply the legacy non-barrier hoses, might be in play. Possibly parameters UNIQUE to our air-cooled engine cars with the primary refrigerant condensing capability mounted directly over a HOT, HEAT-SOAKED, engine and exhaust.

Ford prevents extreme pressure excusions, beyond 250 PSI, of R-134a via a "vent-to-atmosphere" suction side (SUCTION SIDE..??!!) pressure relief valve. Historically even with R-12, pressure excursions above 350 PSI, or even as high as 450 PSI, were prevented the same way, "vent-to-atmosphere" BOVs.

So, all those FACTS considered, what pressure level might our "unchecked" systems rise to post R-134a conversion given the location of the primary refrigerant condensing "container".

Beyond 450 PSI, possibly well beyond, could, SHOULD, be assumed.

An "after-run" cooling fan capability might well alleviate our historical refrigerant leakage problem, even if only the front lip condensor fan is used.

[Bob Kontak]

Originally Posted by brads911sc

What question for the original PO were you trying to answer.

LOL

Kind of a bummer that I will have to PM or call Griff directly if I have an AC question.

The more this stuff perpetuates the less I care about being a "gentleman".

I squared off with Sucker Fish last year. Ain't heard much from him since. Do a search. I kin' get real stupid.

However, wwest did post jokingly about the 800 psi before editing it out this afternoon. I think he has a soft side even though a head-strong stinker.

I am not ready to smoke him out of the hole yet.

[SilberUrS6]

Originally Posted by Bob Kontak

I am not ready to smoke him out of the hole yet.

Even though he befouls every single AC thread with his screed, no matter what the actual question is?

[Bob Kontak]

Well, there is that.

Edit, I do like screed. I looked it up.

....a long discourse or essay, especially a diatribe

Crap - now I have to look up diatribe:

a bitter and abusive speech or piece of writing

Yep - with you.

[SilberUrS6]

LOL, nice.

The English languange can be so colorful. And in written form, the insults can be sublime..

[Bob Kontak]

Originally Posted by SilberUrS6

And in written form, the insults can be sublime..

Not only that but lofty and impressive.

[Ronnie's.930]

Originally Posted by Bob Kontak

I squared off with Sucker Fish last year. Ain't heard much from him since. Do a search. I kin' get real stupid.

Well, this is something else we have in common (in addition to Opel GTs). For some reason, I made it a mission to beat on that idiot, SuckerFish, even though I didn't have a dog in the MM fight. I guess I got sick of seeing him lie, make fun of people, and then say it was for their own good. I must admit, I had a good time taking it to him and got quite a few "thanks" PMs from others on the board that appreciated my nonsense - ha!

You gents are right about the pollution of the a/c threads - hard to believe that every a/c related topic, even one as simple as a specific question about fittings, now includes posts, with pictures, about SPAL fans and pressure switches!