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Can someone recommend a replacement switch for high pressure cut out of the compressor?
Posted: Tue Jul 28, 2026 6:19 pm
by gnvair
I replaced the GM R4 compressor which housed the high pressure cut out switch on my car.
The compressor I am using is a Sanden SD7H15 and does not have a provision for a high pressure switch.
I do have a 3/16" fitting on my liquid line for a cut out switch. The line I have came from a late 80's Camaro and that switch was for controlling the electric fan and specs show it is Open: 255psi Closed: 340psi.
I am looking for something could potential control both the fans and cutting the compressor should the pressures get to high.
Is there something out there that would fit what I am looking for?
Re: Can someone recommend a replacement switch for high pressure cut out of the compressor?
Posted: Tue Jul 28, 2026 6:25 pm
by Tim
Sanden SD7H15 is like saying I had a cup of tea. There are many different variations of that body compressor. 4-digit number tells the story.
Re: Can someone recommend a replacement switch for high pressure cut out of the compressor?
Posted: Fri Jul 31, 2026 7:34 am
by gnvair73
The compressor is a Sanden 4805.
Re: Can someone recommend a replacement switch for high pressure cut out of the compressor?
Posted: Fri Jul 31, 2026 8:08 am
by Tim
Compressor, if Sanden, should have a high-pressure pop valve.
Re: Can someone recommend a replacement switch for high pressure cut out of the compressor?
Posted: Fri Jul 31, 2026 9:33 am
by gnvair73
Yep! Mine has the same GV rear head.
So I should be ok without a high pressure cut off switch as mine has the pressure relief valve?
Re: Can someone recommend a replacement switch for high pressure cut out of the compressor?
Posted: Fri Jul 31, 2026 9:49 am
by Tim
If your pressures are in check. Pop-off should be enough. HPCO switches were popular. Not sure if they are around much these days.
This might work as well.
43-MT4028
Re: Can someone recommend a replacement switch for high pressure cut out of the compressor?
Posted: Fri Jul 31, 2026 3:40 pm
by gnvair73
Thank you Tim
Re: Can someone recommend a replacement switch for high pressure cut out of the compressor?
Posted: Sat Aug 01, 2026 11:59 pm
by Carguychris85
I actually built an AC system on a 1987 Firebird a while back. Unless they have changed something with the newer units, a Vintage Air 11076-VUS trinary switch has 3/8-24 female threads for a 3/16" service port fitting. It screws right into the service port with the valve core still in place. It is rated 30 psi low (cuts off below), 406 psi high (cuts off above) and 254 psi fan on. It threaded right in place of the stock fan switch and I added a high quality Detschewerks 4 wire connector pair to it to enable it to be replaced if necessary with minimal work. It has 2 seperate circuits, Green for the compressor and Blue for the fan relay trigger.