[Supras] A/C issues

[CA Jones]

Thanks for the replys. The shop I took it to was my
normal water pump/brakes/EGR worker bee type shop, not
strictly A/C.

Is 90lbs enough to trip the low pressure switch? What
pressure is standard? 120? Was my guy not well
informed for not bypassing the switch and filling the
A/C up?

I guess what I'm really asking is: Do you think I need
to take it to another shop?


Thanks
Chris
88T Auto

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

Take the car to an A/C shop....

There is a low pressure switch on nearly every (maybe
every) car made 
and
the fact that he didn't know to bypass this switch
scares me.

Some newer cars have a control in the ECM that won't
allow the 
compressor to
turn on after the pressure gets to low and you need a
scanner to reset 
this
but this feature appeared well after the Mk3 went out
of production.  

He should know this.  He may be a good tech with other
things but just 
not
schooled in A/C.

Bob


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