A/C 101

Bernie Benz b.benz at charter.net
Thu Jun 15 15:14:16 EDT 2006


> From: Kneale Brownson <kneale at coslink.net>
> I hook my newly acquired A/C gauge set up to the 200q20v, which has not had
> good cooling lately, and the gauge for the low pressure side shows about 60
> pounds.  The gauge for the high pressure side shows ZERO.
Either you don¹t have the HP service valve(s) open or your gage is dead.
Test it on the LP side. Under static conditions you should have the same
pressure, H and L. 

> When the A/C is
> running, the clutch cycles on and off every few seconds and the low
> pressure gauge drops from 60 to maybe 25 and then goes back up.
The LP switch will shut the system down for insufficient charge at about 40
psi, hence the fast cycling. You either have insufficient charge or the
restrictor orifice is blocked. See Bentley 87.5


> The high
> side doesn't change.  I presume I still have a charge (I'm using
> Envirosafe's R12 substitute).  What don't I have?

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