Jumping Pressure Switch

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philipk65
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Joined: Sun May 28, 2017 12:06 pm

Jumping Pressure Switch

Postby philipk65 » Mon May 29, 2017 8:12 am

Hi,
I'm trying diagnose my '91 Chevy S-10 R12 issues. I'm waiting on a GM high side adapter to test pressures.
But in the mean time, I jumped to lower pressure switch and the compressor kept running.
What does that indicated?
Thanks Kevin
Dougflas
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Re: Jumping Pressure Switch

Postby Dougflas » Mon May 29, 2017 5:08 pm

That may indicate that you're trying to ruin your compressor. You need to monitor both lo and hi sides.
philipk65
Posts: 8
Joined: Sun May 28, 2017 12:06 pm

Re: Jumping Pressure Switch

Postby philipk65 » Mon May 29, 2017 6:16 pm

I read online to jump the switch and see if the compressor runs... I did it for 3 seconds.
What does that tell me?
philipk65
Posts: 8
Joined: Sun May 28, 2017 12:06 pm

Re: Jumping Pressure Switch

Postby philipk65 » Mon May 29, 2017 6:18 pm

Like I said before!... I'm waiting on an adapter to test both side.
Dougflas
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Re: Jumping Pressure Switch

Postby Dougflas » Tue May 30, 2017 2:26 am

Your original post stated that you jumped the switch and compressor kept running. Get both gauges installed and then come back with info.
philipk65
Posts: 8
Joined: Sun May 28, 2017 12:06 pm

Re: Jumping Pressure Switch

Postby philipk65 » Wed Jun 07, 2017 11:13 am

O.K. here are my pressure readings...
at 79 degrees outside temp.

High side- 100 when compressor off and 110 when it runs (on and off ever 3 seconds)

Low side- 94 when the compressor is off and 97 when it runs (on and off ever 3 seconds)

Whats the probable cause for the cycle rapidly?

Thanks!
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Tim
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Re: Jumping Pressure Switch

Postby Tim » Wed Jun 07, 2017 12:53 pm

Have you checked for leaks and repaired them?
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philipk65
Posts: 8
Joined: Sun May 28, 2017 12:06 pm

Re: Jumping Pressure Switch

Postby philipk65 » Wed Jun 07, 2017 1:18 pm

Yes, no leaks.
I think I misread the gauges before. I checked them again.
low side - 40 (compressor off) 21 (when compressor is on)
high side - 102 (compressor off) 120(when compressor is on)
cycles rapidly....
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bohica2xo
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Re: Jumping Pressure Switch

Postby bohica2xo » Wed Jun 07, 2017 2:37 pm

The answer will depend entirely on which engine is in the vehicle.
philipk65
Posts: 8
Joined: Sun May 28, 2017 12:06 pm

Re: Jumping Pressure Switch

Postby philipk65 » Wed Jun 07, 2017 2:55 pm

4.3 L v6

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