Which AC compressor would you use?

[DrewQ45]

Keep in mind I have a 90' Q.

I've come across a few AC compressors which I now have sealed in garbage bags sitting on my garage floor. All are from early G50. One I picked up from Slim with no history and the other two, I pulled from junkyard Qs. Of the two I pulled, one was from a 90 with 135K and the other was a rebuilt compressor (black unit) from a 1992Q with 150K. I also pulled one from a 94Q but ended up not taking it cause I would have had to buy a different belt (due to larger pulley).

My instinct tells me to go with the 92 rebuilt as it probably has seen less usage than the others but I'm not sure of the general reliability of non-oem compressors. I'm going to check the markings on it when I get home. Maybe i'll see something telling me when it was rebuilt.

Tell me what you think....

...Drew...
Modified by DrewQ45 at 11:01 AM 8/21/2006

[elwesso]

first off i checked the belt lengths in the parts book, and theyre the same 90-96...

Are you going to be recharging with R12 or R134...?

[DrewQ45]

first off i checked the belt lengths in the parts book, and theyre the same 90-96...

Are you going to be recharging with R12 or R134...?

I'll be using R134. I already have a new drier sitting in the box and plan to get a full system flush before recharge. I seem to remember mentions of the 94 compressor using a larger belt from those who have tried in early G50. I compared pulleys side by side and the 94 was definately of a larger circumference. Hmmm? Well, no matter, I don't have the 94 so my choices are used remanned with probably lower mileage or used OEM.

BTW Wes, thanks for your help that day. I did manage to pull off a 94 driveshaft which I will install soon. The centerline bearing is a much more robust unit as it has two rubbers surrounds versus 1 on 90-93. Also, the 94's rubber was still supple! I measured them side by side and they should work as they seemed the be the same length. The 94 is at the bottom in the pic below.


Modified by DrewQ45 at 11:13 AM 8/21/2006

[maxnix]

I'll be using R134.

Won't work for long unless you change all seals and hoses.

Won't work well unless you resize condenser and evaporator.

Read Q45tech's posts and save yourself a lot of money, or not.

[DrewQ45]

Won't work for long unless you change all seals and hoses.

Won't work well unless you resize condenser and evaporator.

Read Q45tech's posts and save yourself a lot of money, or not.

The same was said about my Jap takeout transmission which is still shifting fine a year later. The refrigerant change seems to have worked for others according to my research.

1990 Q45, 205K... I'll take my chances.

Lemme save you trouble... "Owners standards vary".... LOL

[maxnix]

[QUOTE=DrewQ45]

The same was said about my Jap takeout transmission which is still shifting fine a year later. The refrigerant change seems to have worked for others according to my research.

1990 Q45, 205K... I'll take my chances.

Lemme save you trouble... "Owners standards vary".... LOL[/QUOTEGambling is gamb|ing, but chemistry and phyics don's have exceptions.

One can only lead horses to water.......

[qsiguy]

I had the R12 -> R134 conversion done on another vehicle and it worked great for several years til I finally sold it. I had no complaints about the conversion. It kept me cool through the Phoenix summer for several years. That's about as tough a test as you can get. That said, I'm sure there are many variables that will determine the success of the conversion.

[elwesso]

the thing is with the 134 conversoin, even if you have to top it off every year its still cheaper than R12!!!!! Over 10 years it may not be, but most people wont mind spending $10 on a can of 134 rather than a ton of money on R12 (if you can even find it!)

It wont give you OEM 34F air at the vents, but who cares, its better than the windows being down...

[Skibane]

Sell all three of them on ebay, and apply the proceeds towards the purchase of a new one from Joe.

If time was free, it MIGHT be worth using a compressor that MAY last another year or two...but it isn't, and you'll be doing it all over again in a few years/months/weeks.

(Well, you asked! )

[Jesda]

The belt lengths arent the same. The AC belt changed slightly in late 92 or something.

[Q451990]

Actually, the early 1990's used a different belt that changed later... I think it was shorter too. They used a revised compressor design later to try to eliminate some of the idle vibrations...

[DrewQ45]

Okay,

So it's almost a year later and I still haven't done my AC. I still have three compressors and am determined to not sweat my *** off this summer. Actually I parked the Q and drove the Dakota which has great AC.

I have a still new-in-the-box drier and the weather is already t-shirt grade on many days here in ATL. I am determined not to buy anything else other than O-rings, regrigerant and an AC flush. Can anyone describe what the flush consists of and can I do it myself? I've never attempted any AC work before.

...Drew...

[DrewQ45]

Just got off the phone with a shop. Said they'll charge me 50 bucks for an AC system flush. They suggested that I not convert to R134 saying I should use Freeze 12 which is a better performer for my current system.

I'm going to remove the compressor and drier then take it for the flush this week.

I'd rather have it flushed by professionals than to leave trash in the lines using the DIY manner.

[Jesda]

$50 is a hell of a deal. And yes, Freeze12 is fantastic (I've used it with amazing results), but make sure your hoses and seals are good. F12 has smaller oil-carrying molecules that will leak out of bad hoses, causing poor lubrication and eventual compressor failure.

[DrewQ45]

That is ONLY for the flush. After flushing, I'll take it home, install the drier and compressor then get it charged up. Anyone know where I can get the necessary O rings other than the dealer? I've heard of some O ring kits somewhere.