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GM Cycling Switch

johnnymo on Mon April 12, 2004 8:59 PM User is offline

Year: 1996
Make: Chev
Model: 1500 Pick Up
Engine Size: 3
Refrigerant Type: 134a
Ambient Temp: 75
Pressure Low: 35
Pressure High: 180

Can the cycling switch be replaced without unloading the system on 1996 a Chevy 1500?

TRB on Mon April 12, 2004 9:09 PM User is offlineView users profile

Yes, unless someone has removed the scharder valve in the port under the switch. You will loose a small amount of refrigerant when unscrewing it just as you loose a little air with a bicycle pump.

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johnnymo on Mon April 12, 2004 10:03 PM User is offline

Thank you very much for the info. This system has been a complete pain. I finally observed that while the sytem is on and the compressor running, if I gently push on either side of the cycling switch it shuts the compressor down. I was hoping not to have to evacuate again. Thanks again

GM Tech on Tue April 13, 2004 12:19 PM User is offline

It may not be the switch- but the connector to it may not be sueazing the pins tight enough- have seen it before- I use a pick and bend the clamps a little. The switch may be fine.......

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

Edited: Tue April 13, 2004 at 12:21 PM by GM Tech

Cookiebaggs on Fri May 21, 2010 11:40 AM User is offline

Quote
Originally posted by: GM Tech
It may not be the switch- but the connector to it may not be sueazing the pins tight enough- have seen it before- I use a pick and bend the clamps a little. The switch may be fine.......

I know this is a really old thread but this worked for me.

I lost a good portion of my charge over the course of a month. Fortunately I added dye on recharge and discovered that the refrigerant was leaking out the cycling switch. I replaced with a new one, pulled a vaccuum and recharged. The compressor would not shut off and was icing up the lines and evaporator. I thought for sure the new switch was bad but I did a search and found this thread. I pulled the switch and gently bent the leads and re-installed. Low and behold, the compressor cuts out at 25!

Thanks GM Tech!

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