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01-10-2017, 02:19 PM
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#1 |
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Registered User
Join Date: Dec 2016
Location: Ferris, Tx
Posts: 38
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A/C Low Pressure Switch question
I need to replace the low pressure switch due to carelessness as I broke one of the terminals off doing other work.
Question: When I unscrew this, will I lose Freon? Sorry, in advance if this seems a dumb question. 1972 C10 with Vintage air, switch is on the dryer |
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01-10-2017, 02:29 PM
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#2 |
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Registered User
 
Join Date: May 2013
Location: WEST PALM FLORIDA
Posts: 1,174
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Re: A/C Low Pressure Switch question
The system needs to be evacuated , switch replaced , and then refilled
__________________
68 Long Fleet , ly6 , turbo 350 , 3-5 drop , original paint , front discs 67 Small window , 7 foot bed , tweaked 6.0 LSX 2004R Medium Olive 58 Apache fleet , 235 , offy intake , dual exhaust , 4 on the floor , red/white 69 Long Fleet , Custom , 6.0, 4l60 , AC , Medium Olive |
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01-10-2017, 02:42 PM
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#3 |
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Registered User
Join Date: Dec 2016
Location: Ferris, Tx
Posts: 38
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Re: A/C Low Pressure Switch question
My issue...this is actually the only switch I see,
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01-10-2017, 02:46 PM
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#4 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Re: A/C Low Pressure Switch question
that has to come out so yes it needs the be sucked dry and replace and vacuum good then refilled.
Are you sure it's a low pressure side switch. The one I installed on my 64 Impala there was high side pressure switch. It cuts the compressore off if to much pressure is made. 
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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01-10-2017, 02:51 PM
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#5 |
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Registered User
Join Date: Dec 2016
Location: Ferris, Tx
Posts: 38
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Re: A/C Low Pressure Switch question
I thought I was sure until I looked and did not see anything else, can you tell by the picture?
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01-10-2017, 02:57 PM
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#6 | |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Re: A/C Low Pressure Switch question
Quote:
 
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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01-10-2017, 03:00 PM
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#7 |
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Registered User
Join Date: Dec 2016
Location: Ferris, Tx
Posts: 38
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Re: A/C Low Pressure Switch question
Thanks again for all of your input, love the pictures
Walter |
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01-10-2017, 03:02 PM
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#8 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Re: A/C Low Pressure Switch question
Welcome.
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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01-10-2017, 04:01 PM
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#9 |
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Registered User
Join Date: May 2013
Location: WEST PALM FLORIDA
Posts: 1,174
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Re: A/C Low Pressure Switch question
Its actually called a trinary switch .
Too high a pressure , it shuts the system down Too low a pressure , it shuts the system down Electric Fan Engagement - 254 psi
__________________
68 Long Fleet , ly6 , turbo 350 , 3-5 drop , original paint , front discs 67 Small window , 7 foot bed , tweaked 6.0 LSX 2004R Medium Olive 58 Apache fleet , 235 , offy intake , dual exhaust , 4 on the floor , red/white 69 Long Fleet , Custom , 6.0, 4l60 , AC , Medium Olive |
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01-10-2017, 05:41 PM
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#10 | |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Re: A/C Low Pressure Switch question
Quote:
Binary switch function: http://www.vintageair.com/Instructions2013/904677.pdf Trinary switch function: http://www.vintageair.com/Instructions2013/900161.pdf
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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