Four Seasons (or other) part number cross reference?

darth_linux

darth_linux

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Does anyone have/know a cross reference part number for this single action thermal expansion valve sold by Bouchillon?

Single Action Expansion Valve - R134 - Bouchillon Performance Engineering

It's what I need but it's about triple the price that it should be.

Hoping to find the same/similar part somewhere more affordable, possibly this one: Amazon.com: UAC EX 10038C A/C Expansion Valve : Automotive

I can't tell thread sizes etc. by looking at a picture, so I don't know if one will work or not . . .

thanks in advance!
 
The catalogs at RockAuto indicate a 4 Seasons 38844 TXV item. I looked in the 4 Seasons online information and found NO ref to the type of gas the valve was compatible with. I did see a ref that it had "green" o-rings with it. Price was just under $23.00 USD. It fits 65-73 Chrysler Corp C-body cars. Plus some similar year Dodge vans and pickups. Can't forget the middle 1960s Shelby Cobras!

CBODY67
 
That’s the dual action valve that's OEM. I’m moving to the single action.
CBODY67 said:
The catalogs at RockAuto indicate a 4 Seasons 38844 TXV item. I looked in the 4 Seasons online information and found NO ref to the type of gas the valve was compatible with. I did see a ref that it had "green" o-rings with it. Price was just under $23.00 USD. It fits 65-73 Chrysler Corp C-body cars. Plus some similar year Dodge vans and pickups. Can't forget the middle 1960s Shelby Cobras!

CBODY67
Click to expand...
 
darth_linux said:
Does anyone have/know a cross reference part number for this single action thermal expansion valve sold by Bouchillon?

Single Action Expansion Valve - R134 - Bouchillon Performance Engineering

It's what I need but it's about triple the price that it should be.

Hoping to find the same/similar part somewhere more affordable, possibly this one: Amazon.com: UAC EX 10038C A/C Expansion Valve : Automotive

I can't tell thread sizes etc. by looking at a picture, so I don't know if one will work or not . . .

thanks in advance!
Click to expand...
Unknown if this is a direct cross to the BPE 6044, but RockAuto has this single action valve for some Chrysler applications, plus others, on closeout for $5.66:

T38608

1222_T38608_1.jpg


The valve is listed with unspecified "Famous Brand", but is likely CarQuest.

The Four Seasons and Murray number 38608 fits 1974-1979 dealer add-on air conditioning for Chrysler products. The Everco equivalent number is A8250. Most factory installations during this time period were the block style expansion valve.

Screenshot 2025-07-17 1.21.39 AM.png
Screenshot 2025-07-17 1.19.47 AM.png

There are several of the Everco, Four Seasons, and other brands of this type on eBay. I borrowed these two pictures from there.
 
Vaanth said:
Unknown if this is a direct cross to the BPE 6044, but RockAuto has this single action valve for some Chrysler applications, plus others, on closeout for $5.66:

T38608

View attachment 727402


The valve is listed with unspecified "Famous Brand", but is likely CarQuest.

The Four Seasons and Murray number 38608 fits 1974-1979 dealer add-on air conditioning for Chrysler products. The Everco equivalent number is A8250. Most factory installations during this time period were the block style expansion valve.

View attachment 727403
View attachment 727404

There are several of the Everco, Four Seasons, and other brands of this type on eBay. I borrowed these two pictures from there.
Click to expand...
Thank you. The pictured TXV have a flare fitting on the end, which my evaporator won’t allow. I’ll find it though eventually.
 
What is the difference between the single-action and double-action TXVs? Never heard that terminology before.

Just curious,
CBODY67
 
CBODY67 said:
What is the difference between the single-action and double-action TXVs? Never heard that terminology before.

Just curious,
CBODY67
Click to expand...
The dual-action has the two capillary tubes while the single-action has just one. From my reading here and other places, the dual action style is not needed if using a Sanden style compressor. Can't remember exactly why.
 
In residential hvac world, the double-action TXV is for heat pump systems, so the bypass for the reversing of gas flow happens internal to the valve with no other external plumbing (as used to be required). Yet in a car application, it would seem the double-action would work fine anyway, as gas flow is one way through the valve. The home valves have a bulb filled with a mix of gases to control the internal valve action, but most of the car TXVs do not have such a bulb.

Not sure why the brand/style of compressor would affect the valve, either?

Take care,
CBODY67
 
CBODY67 said:
In residential hvac world, the double-action TXV is for heat pump systems, so the bypass for the reversing of gas flow happens internal to the valve with no other external plumbing (as used to be required). Yet in a car application, it would seem the double-action would work fine anyway, as gas flow is one way through the valve. The home valves have a bulb filled with a mix of gases to control the internal valve action, but most of the car TXVs do not have such a bulb.

Not sure why the brand/style of compressor would affect the valve, either?

Take care,
CBODY67
Click to expand...
Yep, I don't know either. One of the many threads I read here mentioned using the 38844 TXV if you are keeping the RV-2, but switching to the 38722 if switching to Sanden-style, which seems correct but the latter TXV has flare fittings instead of pipe thread, hence my search. Bouchillon has what I need but they $50 for it. I found something from Amazon that "looks" like it will work for $22, so I just have to wait a few days for it to arrive and then I'll know.
 
Does the Sanden re-use the existing EPR valve for optimum evaporator cooling? Or does it convert to a cycling compressor system?
 
Via Google search, www.vividracing.com indicates the 38722 if calibrated for R-134a. www.partshawk.com specifies R-134a, PLUS giving all of the multitude of cross-ref parts numbers, including with the OEMs. Their illustrations are the same, with the tapered ends and coil on the end of the capillary tube. Might need some of the black sticky tape to wrap around the bulb/end of the coils and the a/c metal line?

CBODY67
 
CBODY67 said:
Via Google search, www.vividracing.com indicates the 38722 if calibrated for R-134a. www.partshawk.com specifies R-134a, PLUS giving all of the multitude of cross-ref parts numbers, including with the OEMs. Their illustrations are the same, with the tapered ends and coil on the end of the capillary tube. Might need some of the black sticky tape to wrap around the bulb/end of the coils and the a/c metal line?

CBODY67
Click to expand...
The 38722 and similar won't work though with the original evaporator, as the tapered ends "butt" up against the evap connection, rather than sliding up to the O-ring.
 
I did a similar Google search and found the www.partshawk.com website for the 38844 TXV. It also states it is compatible with R-134a, with the vast cross-ref listing. In one Chrysler OEM part number listing, looks like it goes back to 1960? It is termed "Externally equalized".


MAIN differences with the 38844 is the TWO capillary tubes. One out of the top with the coil on the end of the tube. ONE out of the side of the valve itself which terminates with a capped connection to some other pipe. ALL connections are o-ringed, with one picture indicating green o-rings.

Might need to consult the FSM to see where those capillary tubes go! Plus the fitting issue of o-rings vs. not o-rings.

From what I'm now seeing, I'll trust the 38844 to be what is needed. FWIW

Just some thoughts and observations,
CBODY67
 
CBODY67 said:
I did a similar Google search and found the www.partshawk.com website for the 38844 TXV. It also states it is compatible with R-134a, with the vast cross-ref listing. In one Chrysler OEM part number listing, looks like it goes back to 1960? It is termed "Externally equalized".


MAIN differences with the 38844 is the TWO capillary tubes. One out of the top with the coil on the end of the tube. ONE out of the side of the valve itself which terminates with a capped connection to some other pipe. ALL connections are o-ringed, with one picture indicating green o-rings.

Might need to consult the FSM to see where those capillary tubes go! Plus the fitting issue of o-rings vs. not o-rings.

From what I'm now seeing, I'll trust the 38844 to be what is needed. FWIW

Just some thoughts and observations,
CBODY67
Click to expand...
If you watch this video, you'll see what the problem is with using the 38722 and why I can no longer use the 38844.
 
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