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Old 02 Jul 2007, 02:58 pm
LostInEwing@gmail.com
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Default NO AC

I have 91 Honda CRX. Tried converting the R-12 to R-134a ac system.
I got some freon into the system, however it is not cooling down
significantly. I have the same problem for an 88 cadillac deville,
4.5L. . I did the following for both cars. While car was running
evacuated what remained of the R-12, within a few seconds. Then
reversed the procedure and recharged the system, with the ac running
on high. For some unknown reason it only takes less than 12oz
[5psi]? Any suggestions will be helpful. Why will it not take
anymore or get colder.

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Old 02 Jul 2007, 03:38 pm
loewent via CarKB.com
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Default Re: NO AC

as far as I know, R12 and R134a are not interchangeable. Unless you do a
crapload of changes in the AC system.

t

LostInEwing@gmail.com wrote:
>I have 91 Honda CRX. Tried converting the R-12 to R-134a ac system.
>I got some freon into the system, however it is not cooling down
>significantly. I have the same problem for an 88 cadillac deville,
>4.5L. . I did the following for both cars. While car was running
>evacuated what remained of the R-12, within a few seconds. Then
>reversed the procedure and recharged the system, with the ac running
>on high. For some unknown reason it only takes less than 12oz
>[5psi]? Any suggestions will be helpful. Why will it not take
>anymore or get colder.


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  #3 (permalink)  
Old 02 Jul 2007, 06:05 pm
Lynn McGuire
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Default Re: NO AC

> I have 91 Honda CRX. Tried converting the R-12 to R-134a ac system.
> I got some freon into the system, however it is not cooling down
> significantly. I have the same problem for an 88 cadillac deville,
> 4.5L. . I did the following for both cars. While car was running
> evacuated what remained of the R-12, within a few seconds. Then
> reversed the procedure and recharged the system, with the ac running
> on high. For some unknown reason it only takes less than 12oz
> [5psi]? Any suggestions will be helpful. Why will it not take
> anymore or get colder.


You need to get a vacuum pump and pull a vacuum on the system
before you charge the system with freon. Otherwise the system is
full of air.

Lynn

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  #4 (permalink)  
Old 03 Jul 2007, 07:55 am
Michael Pardee
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Default Re: NO AC

<LostInEwing@gmail.com> wrote in message
news:1183406323.601424.274000@w5g2000hsg.googlegro ups.com...
> I have 91 Honda CRX. Tried converting the R-12 to R-134a ac system.
> I got some freon into the system, however it is not cooling down
> significantly. I have the same problem for an 88 cadillac deville,
> 4.5L. . I did the following for both cars. While car was running
> evacuated what remained of the R-12, within a few seconds. Then
> reversed the procedure and recharged the system, with the ac running
> on high. For some unknown reason it only takes less than 12oz
> [5psi]? Any suggestions will be helpful. Why will it not take
> anymore or get colder.
>
>

Frankly, I see DIY R134a conversions as risky. Some of that is that I know
there are parts of the job I don't know - when the receiver drier has to be
changed out, how to remove the old oil and put in the type that is
compatible with 134a, what the R134a charge amount is (not the same as the
R12 charge). I do know a properly done conversion involves flushing the
system, draining the oil in the compressor, and pulling a vacuum for 30
minutes, then filling with a prescribed weight of R134a and proper oil.

I had one R12 system in a Volvo professionally converted to R134a after the
compressor seized. It cost $1200 about ten years ago and still performed
poorly compared to the R12 system. It's not too late to take the thing to a
pro, confess your sins, and see about getting it properly serviced back to
R12. Expensive, but going further down the R134a road after this start could
be much more expensive.

For a hint as to why R134a is not for amateurs, look at how the pros
determine how much 134a an undocumented system takes:
http://www.autoacforum.com/messagevi...threadid=11887

Mike



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