Re: [DML] Question about Air Conditioning cycling
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Re: [DML] Question about Air Conditioning cycling



The outside temp was about 70 deg F, and I was cruising around town 
and not really revving the engine high.  As far as the filling of 
R134A, when I brought it in for filling last August, I belive the 
mechanic used the number from the owner's manual, as I did not know 
how much refrigerant to tell him.  However, the manual must indicate 
the amount of R-12 to use, instead of R134A.  Perhaps this is a 
problem for me. 

Paul



--- In dmcnews@xxxxxxxxxxxxxxx, "Tom" <tomciodmc@...> wrote:
>
> Hi
> The symptoms you're describing can either mean that your A/C is 
perfectly fine or that you have a small leak. It depends on the 
outside temperature. The colder it is the shorter the compressor 
will stay on and the hotter it is the longer it will stay on. It 
also depends on the engine rpm. A short cycle as you described at 
idle would mean it's ok as long as the outside temperature was 
around 60 degrees F. If the temperature was higher than that it 
probably means you have lost some of the refrigerant over the winter 
which is to be expected with R-134a refrigerant and old R-12 hoses. 
The reason for that is because of the molecule size difference 
between the refrigerants. R-134a molecules are smaller than R-12 
ones. For that reason converted systems often leak slowly because 
the gas escapes right through the rubber hoses. The really proper 
way to do a conversion to R-134a is to replace all rubber hoses and 
use barrier hoses designed for R-134a. Or.... You can keep refilling 
the system every spring. Just keep in mind that the proper and only 
accurate way to measure the amount of refrigerant in the system is 
to evacuate it completely and then refill it with the proper amount 
of R-134a - for a DeLorean it should be about 2.0 - 2.2 lbs. of R-
134a.
> Hope this helps
> Good luck
> 
> Tom Niemczewski (on vacation)
> Vin 6149 
> 
> -----Original Message-----
> > However, the constant 
>    >cycling of the cooling fans worries me.  The fans will stay on 
for only 
>    >two seconds, and off for about 5 seconds, on and off on and 
off.  
>    >Wouldn't this cause excessive wear on the fans to energize 
them every 5 
>    >seconds, and they only stay on for 2 seconds?  It doesn't seem 
right.  
>    >The cycle tiem seemed to be longer last year when I had it 
charged in 
>    >August.  I have the R134 conversion.
>









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