C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

What is this sensor?

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Old May 10, 2026 | 04:21 AM
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Default What is this sensor?

Hey all, doing some tune up changing out spark plugs. They were super tight from the previous owner and when number 4 broke loose, I snapped this sensor. What is it? I can't seem to find a direct replacement as I originally thought is was A/C but the female fittings are all too big (1985 z51).



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Old May 10, 2026 | 08:07 AM
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Is this it, working from memory only.
If so you might need to climb under the hood of some old GM vehicles in a Junkyard.

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Old May 10, 2026 | 03:06 PM
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Originally Posted by s carter
Is this it, working from memory only.
If so you might need to climb under the hood of some old GM vehicles in a Junkyard.
It could be, I've bought a few low pressure cycling switches and they were all too big. Are these no made anymore?
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Old May 10, 2026 | 03:21 PM
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Originally Posted by Allenvet
It could be, I've bought a few low pressure cycling switches and they were all too big. Are these no made anymore?

That is on the liquid line so it is a high pressure switch.

EDIT: The original part # is 10007057 but may be discontinued. You'll have to trace from here.

Last edited by arbee; May 10, 2026 at 03:37 PM.
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Old May 10, 2026 | 03:41 PM
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I ran the number you gave, available
https://corvetteparts.com/search?q=10007057
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Old May 10, 2026 | 04:47 PM
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Originally Posted by s carter
I ran the number you gave, available
https://corvetteparts.com/search?q=10007057
This is the problem I've been having, the low and high have the same part number but different female sizes
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Old May 10, 2026 | 05:11 PM
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Looks like your going to Junkyards, I know of a couple of couple of them in junk yards, one of them might ship. The other I'm not going to for awhile.
These guys would probably ship


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Old May 10, 2026 | 05:52 PM
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Originally Posted by arbee
That is on the liquid line so it is a high pressure switch.
There are (2) switches on that line. Both are Normally Closed contacts, but have different pressure thresholds and different connectors.
The one that is broken (larger connector) is the Compressor Clutch Cut Out. Basically a safety shutoff if high side pressure gets dangerously high such as if the electric cooling fan malfunctions.
The other one (small connector) is the cooling fan request switch. It opens to send a "fan request" signal to the ECM to turn on the cooling fan. (This input is independent of the Coolant Temperature input.)

I would suggest Mark at Mirrock as a source. He should have it, and he knows the C4 well enough because he's parted out hundreds of C4 that he will send you the switch you need the first time.
He has an e-bay store, but I find that an inquiry by email works well for what may not be in his e-bay store, and he generally does not take phone calls. info@mirrockcorvette.com
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Old May 11, 2026 | 12:04 AM
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Originally Posted by Allenvet
This is the problem I've been having, the low and high have the same part number but different female sizes
^^^^^^^^^^^^ Not sure where you are getting your info from but definitely wrong. The low line cycling switch operates ~25 - 45 PSI. The high line high limit is ~450 PSI.
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Old May 11, 2026 | 03:24 PM
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Originally Posted by IHBD
There are (2) switches on that line. Both are Normally Closed contacts, but have different pressure thresholds and different connectors.
The one that is broken (larger connector) is the Compressor Clutch Cut Out. Basically a safety shutoff if high side pressure gets dangerously high such as if the electric cooling fan malfunctions.
The other one (small connector) is the cooling fan request switch. It opens to send a "fan request" signal to the ECM to turn on the cooling fan. (This input is independent of the Coolant Temperature input.)

I would suggest Mark at Mirrock as a source. He should have it, and he knows the C4 well enough because he's parted out hundreds of C4 that he will send you the switch you need the first time.
He has an e-bay store, but I find that an inquiry by email works well for what may not be in his e-bay store, and he generally does not take phone calls. info@mirrockcorvette.com
I'll shoot him an email. Thank you so much for the info
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Old May 11, 2026 | 03:27 PM
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Originally Posted by arbee
^^^^^^^^^^^^ Not sure where you are getting your info from but definitely wrong. The low line cycling switch operates ~25 - 45 PSI. The high line high limit is ~450 PSI.
Well, I know it's not wrong because I've given the part number to multiple stores and have received different switches. The switches themselves have the same part number, but do not thread on as they are larger. I do appreciate your assistance, it looks like I'll be going to some junkyards! Lol
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Old May 11, 2026 | 04:13 PM
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Originally Posted by Allenvet
Well, I know it's not wrong because I've given the part number to multiple stores and have received different switches. The switches themselves have the same part number, but do not thread on as they are larger. I do appreciate your assistance, it looks like I'll be going to some junkyards! Lol
^^^^^^^ Well, in my books, if you receive two different switches but have the same part number, then that would qualify as "wrong".


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Old May 11, 2026 | 04:37 PM
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Originally Posted by Allenvet
I'll shoot him an email. Thank you so much for the info
Include the picture of the broken switch, the location, and the YEAR of your car.
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