[Supras] Trouble shoot A/C compressor

[Dan Gyoba]

On 6 May 2006 at 6:17, CA Jones wrote:

> Good morning all,
> My A/C quit working. I've had a slow leak that
> required a can of R12 every other year or so. I took
> it to my favorite mechanic and was told the compressor
> was not kicking on. I was told there was a good amount
> of R12 in the system (90lbs) so the two cans of R12 I
> supplied were not needed. They belived the low
> pressure switch was not allowing the compressor to
> kick on but could not add more R12 without the
> compressor kicking on. Can you say catch-22?
> 
> I've been going to this shop for a while but I've
> never met the guy that worked on it this time. 
> 
> Just wanting other's opinion on my situation.
> 
> Thanks 
> Chris
> 88T Auto

The low pressure switch is just that, a switch.  
It can be bypassed in order to force the 
compressor on.  This is standard practice for an 
AC shop when they're evacuating/recharging the 
system.

They know that the pressure will be low when the 
system's been evacuated, but they also know that 
they're adding refrigerant, so it'll be okay.

Good luck,

Dan Gyoba
'89 NA 430,537 kms, 
http://www.abstractconsulting.com/~dan