BoostGuy951

I've been thinking about this for quite a while. I live in an extremely hot/humid place, and I drive (yeah right, drive) a Black/Black leather '51. I've never been satisfied with the A/C, even when it was running right. So with everything going back together, it makes sense to do that kinda thing now. I know jack about A/Cs. Whats the major limiting factor here? Compressor size/psi? Condenser core size? I would love to have a hot rodded A/C that feels like you stepped into a freezer.

Someone learn me.

951Porschiste

Try this link for some info on air conditionning

hosrom_951

Joe: The ac freezes my car in 120+F weather here, all factory components (yes 19 year old compressor, condensor, pressure switch, expansion valve and so on). You sure you don't have something else in the ac system?

BoostGuy951

That's pretty much what I heard from Eyal too. I wonder if mine was every running up to par.

aeronautica86

did a PO convert the a/c to r134a? if so it wouldn't perform as well as the r12 it came with from the factory

951Tom

Also make sure your heater valve is shutting off otherwise the a/c will be fighting that as well as the heat outside.

Tom
'87 951
'86.5 Supra

fun951

I have converted my system to R134a and it gets too cold in any condition,somthing must be wrong
with your system.

hosrom_951

When i asked the local ac specialist on the difference between R12 and R134a, he informed me that the only difference is that the R134a is environmentally friendly, and has NO other effects. Thing is, with parts being replaced to convert from R12 to R134a, it is no suprise that one (or more) of the parts replaced was faulty/tired and thus gives better cooling. Hence, making one believe R134a is 'better' than the R12.

PS: This was from an ac specialist with 25+years experience, no bs.

z3bra

Yeah there are other effects, R134a has been linked to testicular cancer and causing seizures among other exciting "fringe benefits."

Flammable or not, legal or not, I still think the best refrigerants are hydrocarbon based (aka isobutate or propane). They blow as cold or colder than R12 does. They're flammable sure, then again so's the 20ish gallons of gasoline in your gas tank and other than the combustion hazard they really don't have any other nasty hidden effects like R134a does. R134a is also flamable and the byproducts of its combustion are fun things like Phosgene gas instead of carbon dioxide and water vapor like they are with a hydrocarbon refrigerant. What I'm getting at here is that R134a is easier on the ozone layer than R12 is, but it's hardly what I'd consder a good replacement, it's just a "good enough" replacement.

On the positive side, an AC system full of a flammable hydrocarbon is great incentive for anyone trying to quit smoking not to smoke in the car.

ZV

Chalk me up as another proponant of the HC based refirgerants. They work amazingly well and the relative risk is minimal.

Ski

Joe, Griffiths has the best stuff and $$ but the compressor and his condensor - jwl can hang meat in his car. I have the Sanden compressor, stock condensor, and I use Enviro Safe freon http://www.btt.7p.com/AR/ , my car is Cold - point, either system is good but Griffiths delivers what he says just in case you were wondering.

One thing to make sure of is if your "recirc" button is closing the flaps on the side of the blower motor, inside the screens, you can see them. If it's not then your not going to get the cool air no matter what you try; make sure those flaps are closing on both sides.

Sam Lin

I recently got the Griffiths stuff as well, excellent service and great product!

Sam

ehall

ski, thanks for the link.

KLR

Mine is r134a as well and works great when fully charged. All stock components except for a rebuilt denso compressor and new receiver/drier.