B

BLB

Guest

• Jul 24, 2006

• #1

1994 GMC K-1500

"AC" is blinking on the climate control display. Compressor will not
cycle to take in freon.

I jumped the low pressure side.. no clutch cycle.
I jumped the high pressure side... no clutch cycle.
I jumped both sides.. no clutch cycle.

 

S

SnoMan

Guest

• Jul 24, 2006

• #2

On 24 Jul 2006 13:30:10 -0700, "BLB" <BrianLBerry@gmail.com> wrote:

>1994 GMC K-1500
>
>"AC" is blinking on the climate control display. Compressor will not
>cycle to take in freon.
>
>I jumped the low pressure side.. no clutch cycle.
>I jumped the high pressure side... no clutch cycle.
>I jumped both sides.. no clutch cycle.


What happens if you hot wire 12 volts to clutch? (checking to see it
is it bad)
-----------------
The SnoMan
www.thesnoman.com

 

B

BLB

Guest

• Jul 24, 2006

• #3

Kevin from another board answered it for me! Evidently, a fault is
detected if the clutch does not cycle within so many times in so much
time period. When this happens, the AC faults. He told me to
disconnect the battery to resolve the fault. So I disconnected the
batery, jumped the low pressure switch, then reconnected the battery.
Started the truck, and the AC compressor was working!!! I immediately
put in the freon charge, and removed the jumper & reconnected the
switch. Now enjoying cold air.


SnoMan wrote:
> On 24 Jul 2006 13:30:10 -0700, "BLB" <BrianLBerry@gmail.com> wrote:
>
> >1994 GMC K-1500
> >
> >"AC" is blinking on the climate control display. Compressor will not
> >cycle to take in freon.
> >
> >I jumped the low pressure side.. no clutch cycle.
> >I jumped the high pressure side... no clutch cycle.
> >I jumped both sides.. no clutch cycle.
>
>
> What happens if you hot wire 12 volts to clutch? (checking to see it
> is it bad)
> -----------------
> The SnoMan
> www.thesnoman.com

 

S

SnoMan

Guest

• Jul 25, 2006

• #4

On 24 Jul 2006 15:50:07 -0700, "BLB" <BrianLBerry@gmail.com> wrote:

>Kevin from another board answered it for me! Evidently, a fault is
>detected if the clutch does not cycle within so many times in so much
>time period. When this happens, the AC faults. He told me to
>disconnect the battery to resolve the fault. So I disconnected the
>batery, jumped the low pressure switch, then reconnected the battery.
>Started the truck, and the AC compressor was working!!! I immediately
>put in the freon charge, and removed the jumper & reconnected the
>switch. Now enjoying cold air.
>


Good deal, I had forgotten about that. Glad you are chilling.
-----------------
The SnoMan
www.thesnoman.com

 

P

PeterD

Guest

• Jul 25, 2006

• #5

On Mon, 24 Jul 2006 22:10:19 GMT, SnoMan <admin@snoman.com> wrote:

>On 24 Jul 2006 13:30:10 -0700, "BLB" <BrianLBerry@gmail.com> wrote:
>
>>1994 GMC K-1500
>>
>>"AC" is blinking on the climate control display. Compressor will not
>>cycle to take in freon.
>>
>>I jumped the low pressure side.. no clutch cycle.
>>I jumped the high pressure side... no clutch cycle.
>>I jumped both sides.. no clutch cycle.
>
>
>What happens if you hot wire 12 volts to clutch? (checking to see it
>is it bad)
>-----------------
>The SnoMan
>www.thesnoman.com

Does it flash for about two minutes then stop? (and repeat this each
startup?) If so check the low freon switch and wires, connector at the
rear fo the A/C control head, and the unit.

You may have multiple problems, low freon being just one.