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r12 to r134 and t/f to p/f condenser. How much r134a?

vdubspeed on Wed May 07, 2008 3:19 PM User is offlineView users profile

Year: 1979
Make: VW
Model: Rabbit
Engine Size: 1.8
Refrigerant Type: r134

So my a/c is doing good but I have NO idea how much freon is in the system. I've went from a york to a sanden 508 and from an old tube and fin to a new parallel flow condenser which has way smaller passages. The drier and evap are the same size.

My vehicle is more closely related to a VW Scirocco as far as a/c goes which calls for 40oz's of R12.

So 80% of 40 is 32 but that doesn't account for the condenser swap.

The reason I ask is because tomorrow I'm having the local auto hobby shop here on base evacuate my system, tell me how much was in it and refill by weight...not by pressures.

After that...I can do no more for the a/c system. It is what it is.

Thanks as always,

Jason



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TRB on Wed May 07, 2008 4:18 PM User is offlineView users profile

As I stated in one of your other threads. When we convert a system using a true PF condenser. We can charge a system almost back to the OEM capacities.

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vdubspeed on Wed May 07, 2008 4:56 PM User is offlineView users profile

hmmm...Sorry TRB...I don't recall you ever saying that but my memory is pretty weak.

Can you explain why a system with an upgraded condenser can take up to OEM specs? Is it because the new condenser can handle the heat better.

Thanks a million,

Jason

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TRB on Wed May 07, 2008 5:04 PM User is offlineView users profile

Quote
Originally posted by: vdubspeed
Is it because the new condenser can handle the heat better.

That is correct. Only reason people try and under charge a system. The R12 condenser can't handle the heat load.



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When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

mk378 on Wed May 07, 2008 5:05 PM User is offline

Ideally, the condenser contains mostly gas not liquid. The internal volume doesn't matter much. As soon as liquid condenses, it is just in the way if it sticks around in the condenser. It should clear out and go to the receiver-drier. This is a major advantage of a PF condenser, the bottom tube of each section is a shortcut for liquid to head for the outlet.

Also on a TXV system there is a few oz of buffer space in the receiver.

If the amount you weigh out is more than the original R-12 amount, try putting just the R-12 spec back to start with.

vdubspeed on Wed May 07, 2008 5:44 PM User is offlineView users profile

thanks all.

I went out to my other car that still has the factory a/c sticker and it calls for 907+85 grams. So that's 32oz's(2lbs) up to 35oz's.

With the new comp and condenser...what would be the ideal weight to tell the tech to add?

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mk378 on Wed May 07, 2008 10:32 PM User is offline

Since it's working with the amount you have, use that same amount that gets weighed out from recovering. Unless it is more than 35 oz, in which case you should try just 35 oz and test it.

While you're at the shop, do a quick scan for leaks with an electronic detector.

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