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How to replace the expansion valve?

Tiny
DAVENOOB
  • MEMBER
  • 2005 FORD FIVE HUNDRED
  • V6
  • 2WD
  • AUTOMATIC
  • 110,000 MILES
Doing ac change and the kit came with expansion valve. Can you share info on changing? Thanks.
Sunday, December 1st, 2024 AT 10:48 AM

7 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,420 POSTS
Sure, the expansion valve is bolted to the evaporator inside the car, but the expansion valve sits at the firewall. Here is how to change it out and this video can help vacuum down and recharge the system.

https://www.youtube.com/watch?v=4EqdrBVb0sY&t

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Sunday, December 1st, 2024 AT 1:02 PM
Tiny
DAVENOOB
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Thanks I'm having shop take refrigerated and rented vacuum to suck out the moisture. Also, I'm supposed to vacuum down after new repairs/replacement as well to pull any moisture that might have gotten into the open system, correct?

The only way to recharge the system that I have is the cans from auto store. Is that possible with the new compressor? Some compressors won't engage without charge pressure will this be an issue?
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Sunday, December 1st, 2024 AT 3:57 PM
Tiny
KEN L
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Yes, you are supposed to vacuum down the system anytime it has been opened. Yes, you can add refrigerant to the system from a can which will work just fine. Once the system has pressure the compressor will kick on so you can complete the charge.
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Monday, December 2nd, 2024 AT 9:39 AM
Tiny
DAVENOOB
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  • 190 POSTS
Will I need to add new pag oil or will the vacuum do that for me? How much pag oil or how do it tell?
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Monday, December 2nd, 2024 AT 10:32 AM
Tiny
KEN L
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When replacing the expansion valve no PAG oil is needed. You should be able to see a slight amount of oil inside the refrigerant tubes and valve.
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Tuesday, December 3rd, 2024 AT 9:05 AM
Tiny
DAVENOOB
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Okay, kind of a crossover question. When replacing my compressor, evaporator, and dryer do I need to add oil or what's in the line should be good enough?
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Tuesday, December 3rd, 2024 AT 9:31 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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The new compressor is the only part you need to worry about, it will have the correct amount of oil, or it will have instructions on how to set the compressor up before installation.
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Tuesday, December 3rd, 2024 AT 10:24 AM

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