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AC Issues: Binary Switch Replacement

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Old Jun 18, 2019 | 03:18 PM
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AC Issues: Binary Switch Replacement

Hey guys,

So the truck hasn’t blown cold air since I got it. I’ve had a mechanic take a quick look at during a rotor replacement and said everything looks fine.

So searching I’ve found something called an AC Binary switch.

Anyone have a part number for an Early 99?

Im curious if a $13 part will fix my issues.


 
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Old Jun 18, 2019 | 03:39 PM
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From: St Louis
That's the "High Pressure Cutout Switch". Never heard of one going bad. Doesn't mean it's not possible, but there are half a dozen more likely suspects.
 
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Old Jun 18, 2019 | 03:58 PM
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this was the youtube video I watched that got me thinking

 
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Old Jun 18, 2019 | 06:54 PM
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From: St Louis
Besides just watching that video, did you do any actual troubleshooting?
 
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Old Jun 18, 2019 | 07:26 PM
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So my A/C was out for a while too. I was starting troubleshooting the clutch and got to this plug. As I went to unplug it, the A/C clutch kicked in.
After some cleaning of both ends and a little manipulation of the male pins I popped the plug back together and no more a/c problems.
 
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Old Jun 18, 2019 | 07:29 PM
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Originally Posted by ZachinCO
So my A/C was out for a while too. I was starting troubleshooting the clutch and got to this plug. As I went to unplug it, the A/C clutch kicked in.
After some cleaning of both ends and a little manipulation of the male pins I popped the plug back together and no more a/c problems.
Im going to try cleaning it tonight as well.

Brand new they look pretty cheap. But would want to confirm the Part Number.
 
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Old Jun 18, 2019 | 07:49 PM
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Originally Posted by socal_pzy
Im going to try cleaning it tonight as well.

Brand new they look pretty cheap. But would want to confirm the Part Number.
My issue was the female plug. The contacts inside have spread over the years. I'd replace that before the fixed end.
But like I said, I was able to get the contacts to tighten and no more issues
 
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Old Jun 18, 2019 | 08:22 PM
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From: St Louis
To test if the switch is the issue, simply unplug it and insert a jumper into the pins of the plug to simulate the closed switch. If the clutch doesn't kick in with the jumper installed, move on. you can use the same procedure to check the low pressure switch on the accumulator.

You might want to read the HVAC FAQS, the link is in my signature below. Although originally written for the half-tons, they also apply to the Super Duty models.
 
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Old Jun 19, 2019 | 04:51 PM
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So I was playing around with it last night. Just simply connecting / disconnecting didn’t change anything.

Im going to try the jumper test later this week.

im looking for diagram for wiring but I’m curious if the yellow/green wire goes to the high cut out pressure switch?

also near the low pressure switch was a tube that looked have have a snap on seal loose.






 
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Old Jun 20, 2019 | 08:05 PM
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My plug was causing my A/C to be occasionally inop. I found it just by dumb luck.

The problem was the contact tension wasn't allowing a good, dependable connection.

I popped the locking pin out of the connector, pushed out the pins, and used a fine needle-nose pliers to squeeze the contact an RCH, and replaced it on the switch.

It has played just fine for at least the last two years.

Pop
 
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Old Jun 21, 2019 | 04:03 PM
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Any tips for removing the High Pressure Cutout Switch?

Just use a wrench.

And its ok to leave leave the batter still connected?
 
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