A/C pressure switch replacement

A/C pressure switch replacement

Postby SLIMESTER [OP] » April 26th 2015, 8:06pm

If I remove the a/c pressure switch that is attached to the drier/accumulator to put in another one would I lose refrigerant? I ask because mine has a bad connection on the plug itself. If I seat the plug in a certain way the a/c clutch works fine for a while. When not working properly I have to wiggle it and slightly unplug it to work again. I don't think it's the wire itself, I think it is how it seats into the switch. So can I change the switch without losing my refrigerant?
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Re: A/C pressure switch replacement

Postby chevymaher » April 26th 2015, 8:51pm

You can't. Refrigerant got to be taken out first. Or your going to spray and loose your oil to in the process. Possible freeze a finger and break it off terminator style.
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Re: A/C pressure switch replacement

Postby AstroWill » April 28th 2015, 6:26pm

Also, once you recover the refrigerant you can then replace the switch. Then you have to vacuum out the system using a vacuum pump(can be borrowed/rented at some LAPS) before refilling the system.

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Re: A/C pressure switch replacement

Postby Astro Pop » April 28th 2015, 7:24pm

Unless chevy did something different on the Astros, there is a schrader valve behind the switch that should keep the R-134 in the system. I've changed lots of them and not lost any refrigerant. Usually a 5 min job.
That said, if the valve is stuck, be sure to have a good grip on the switch and be ready to quickly and forcefully screw the switch back on. Then gently tap the accumulator around the switch to see if you can reset the schrader and try again. If no luck then you can have the new switch ready to go and hopefully jamb it on without too much loss of refrigerant. Not preferred or easy but can be done. Wear work gloves and have a tool to firmly grip the switch. That is the worst case scenario, 99% of the time it twists off easily and goes back on easily. Be sure to lightly oil the o-ring on installation.
Good luck
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Re: A/C pressure switch replacement

Postby Leeann_93 » April 29th 2015, 4:52am

^ that was my experience, too - both with my '93 Bravada and my Astro.
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Re: A/C pressure switch replacement

Postby chevymaher » April 29th 2015, 1:38pm

Leeann_93 wrote:^ that was my experience, too - both with my '93 Bravada and my Astro.

Cool learn something new everyday.
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Re: A/C pressure switch replacement

Postby SLIMESTER [OP] » April 29th 2015, 4:26pm

Cool, thanks to all who responded to my question. I did watch a Youtube video where a guy removed the pressure switch without losing refrigerant. Thanks again. :obscene-drinkingcheers:
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Re: A/C pressure switch replacement

Postby AstroWill » April 29th 2015, 4:41pm

I'm surprised I didn't notice that, my system was basically empty to begin with so it didn't matter anyway but there was still some pressure in there that was released. Learn something new every year.

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Re: A/C pressure switch replacement

Postby Lumpy » April 29th 2015, 11:41pm

AstroWill wrote:I

... Learn something new every year.


Every eleven days for me. But I are dumber than youz.

I've had mine out and not lost refrigerant.


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