[DML] Re: A/C problem: compressor is not cycling
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[DML] Re: A/C problem: compressor is not cycling

Did your A/C ever cycle properly?

A PO removed a diode on my car which caused the compressor to engage 
and stay engaged as long as the fans were on.  I'd be riding along 
in VENT and suddenly get a blast of cold air because the otterstat 
kicked the cooling fans on. With AC turned on, the fans came on 
immediately and I never saw any cycling either.


--- In dmcnews@xxxxxxxxxxxxxxx, Travis Graham <tgraham@...> wrote:
> Hello,
> After a month of sweating it out, I now have air conditioning 
> again, but something appears to be wrong: the compressor runs  
> constantly whenever the A/C is on.
> Known quantities:
> 1) The system has a small leak somewhere - it loses enough  
> refrigerant to stop working after approximately 3 months.  I'm  
> working on finding the leak, which is why I'm charging it up.
> 2) I charged the system yesterday and noticed that the compressor 
> constantly.  Thinking that somehow I overcharged it, today I 
> the refrigerant, evacuated the system to 29 in-Hg for 30 minutes,  
> held that for another 30 minutes (did not lose a bit of vacuum), 
> charged the system with 2.0 pounds of R-12 (purposefully  
> undercharging it initially to see if it would cycle more  
> frequently).  The air at the center vent is cold (40 deg. F when  
> moving, around 60 when sitting), but the compressor still does 
> cycle (at least, as far as I can tell; I do have Fanzilla, so 
> tough to tell if it's cycling when I'm moving).
> 3) The ambient temp. is a humid 90 degrees F and my cooling fans 
> running constantly with the A/C on.  Pressures from the manifold  
> gauges are...
> rest pressure: 69 psi (low and high)
> @ idle:
> low side: 42 psi
> high side: 155 psi
> @ 2500 RPM (car not moving):
> low side: 28 psi
> high side: 206 psi
> 4) My orifice tube, accumulator, high and low pressure switches 
> replaced 4 months ago when the system was last recharged (and 
> replace the accumulator and orifice tube again when I open it up 
> replace whatever is leaking).  As far as I know, everything was  
> working and the compressor was cycling normally the last time 
> therefore, I don't suspect faulty switches (I didn't have gauges  
> then, so I don't know the pressures).
> Section N:09 of the good book seems to point to a faulty orifice  
> tube, clogged compressor inlet screen, or overcharging.  Given my  
> data, could that be right?  I tested the calibration of the tank  
> scale this morning, so I don't think I'm overcharged (especially  
> since I only put 2.0 pounds in).
> Any advice on how to proceed would be greatly appreciated.
> Thanks!
> Travis Graham
> #6344

To address comments privately to the moderating team, please address:

For more info on the list, tech articles, cars for sale see www.dmcnews.com

To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews 
Yahoo! Groups Links

<*> To visit your group on the web, go to:

<*> To unsubscribe from this group, send an email to:

<*> Your use of Yahoo! Groups is subject to:

Home Back to the Home of PROJECT VIXEN

Copyright 2006 ProjectVixen.com.  All rights reserved.

Opinions expressed in posts reflect the views of their respective authors.
DMCForum Mailing List Archive  DMCNews Mailing List Archive  DMC-UK Mailing List Archive