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The A/C was blowing cold prior to pulley freezing up, A/C compressor pulley is in pieces?

Tiny
JOE IANNIELLO
  • MEMBER
  • 2008 MERCEDES BENZ GL450
  • 4.7L
  • V8
  • 200,000 MILES
How do I determine what to replace besides the compressor? The A/C was blowing cold prior to pulley freezing up. Examples: Should I replace the condenser, do an A/C flush, replace all the seals? I have access to a vacuum system.
Tuesday, September 3rd, 2024 AT 12:50 PM

20 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
If the compressor came apart internally it will spread metal and seal material throughout the system so it will need to be flushed and the expansion valve replaced. Can you tell if there is debris inside the refrigerant tubes?

Here is a video to help with the job and how to change out the compressor and expansion valve:

https://youtu.be/4EqdrBVb0sY?si=tqE2yNp1wekpSNq3

Check out the images (below). Please upload pictures or videos in your response of any problems so we can see what to help you with.
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Tuesday, September 3rd, 2024 AT 3:45 PM
Tiny
JOE IANNIELLO
  • MEMBER
  • 14 POSTS
Thank you for the prompt response. I'll break it apart, and report back. Does my AC system have a high side port? I could only find the low side. The low-pressure port is centered no obvious high side. Thanks
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Wednesday, September 4th, 2024 AT 8:01 AM
Tiny
KEN L
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The high side pressure port will be on the smaller tube (liquid line) which is at the condenser in the front of the car. Check out the images (below). Let us know how it goes.
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Wednesday, September 4th, 2024 AT 10:18 AM
Tiny
JOE IANNIELLO
  • MEMBER
  • 14 POSTS
Found it, thanks to you! Here's where I'm at now. I will remove the old locked up ac compressor. Then inspect for metal particles in the line.

I'll report back to you then. I'll hit this job Monday next week. Does this sound like a plan?
Thx
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Wednesday, September 4th, 2024 AT 12:32 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Yep, Yep! Let me know how it goes, I am here to help.
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Thursday, September 5th, 2024 AT 8:00 AM
Tiny
JOE IANNIELLO
  • MEMBER
  • 14 POSTS
Hi Ken,

Removed old A/C compressor. I purchased OEM Denso.
1) New A/C compressor appears to be an exact match. The new comp does not have any instructions. Did you know if the new ac compressor arrived with the correct PAG oil, and with the correct amount of it?
2) The high and low coolant lines, do not appear to have any metal particles in it.

If you inform me the DENSO AC comp is able to be installed without worrying about the type of oil in it, and quantity is good to go.
Do you think I need to purchase an A/C condenser, and drier?
Thank you!
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Sunday, September 8th, 2024 AT 2:40 PM
Tiny
KEN L
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Wow, that compressor came update all right lol. I would do the dryer which is a normal service item when doing AC work. DENSO is pretty good about adding the correct amount of oil that is high quality as well, (they don't want the compressor to come back) you can add 2 ounces extra to be safe. Let me know how it goes.
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Monday, September 9th, 2024 AT 8:04 AM
Tiny
JOE IANNIELLO
  • MEMBER
  • 14 POSTS
Hi Ken, Are you available?
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Monday, September 9th, 2024 AT 11:08 AM
Tiny
JOE IANNIELLO
  • MEMBER
  • 14 POSTS
Disregard previous I'll keep you posted.
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Monday, September 9th, 2024 AT 11:09 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Sounds good, make sure you vacuum system system down as well.
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Monday, September 9th, 2024 AT 12:00 PM
Tiny
JOE IANNIELLO
  • MEMBER
  • 14 POSTS
Hi Ken,

1) Can you send the procedures to replace my 08 MB GL450's ac drier?
2) You recommended that I add 2 ounces of PAG oil to the new DENSO ac comp. A. What type PAG oil? Which whole should I add it to?
3) Are new O rings necessary?
Thank you
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Tuesday, September 10th, 2024 AT 3:01 AM
Tiny
KEN L
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  • 48,363 POSTS
Hi Joe,

You want to use PAG oil from the auto parts store should be fine, I would use new O rings for sure. Here is how to replace the receiver dryer. Check out the images (below). Let us know how it goes.
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Tuesday, September 10th, 2024 AT 9:34 AM
Tiny
JOE IANNIELLO
  • MEMBER
  • 14 POSTS
Hi Ken, I've had to put the project on hold. The drier hasn't arrived. I think the Hurricane might have hurt the shipping. Should I flush the lines since I'm replacing the compressor and drier? I would prefer not to, but if it makes sense I'll do it. Thank you!
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Saturday, September 14th, 2024 AT 11:21 AM
Tiny
KEN L
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If the inside of the system looks clean, I would not flush the lines. Yep, that Hurricane was rough, disrupting to say the least.
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Sunday, September 15th, 2024 AT 9:19 AM
Tiny
JOE IANNIELLO
  • MEMBER
  • 14 POSTS
The oil is black, no obvious debris from the destroyed compressor. Am I making a mistake by not flushing the system while I'm waiting on parts? Thank you!
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Monday, September 16th, 2024 AT 6:52 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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If the oil is black I would flush the system.
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Monday, September 16th, 2024 AT 10:19 AM
Tiny
JOE IANNIELLO
  • MEMBER
  • 14 POSTS
Car's back in operation. AC's blowing cold again! Thank you! I decided not to flush the ac system. Wish me luck!
I would like to PayPal you a tip (money) is that possible?

Before I sign off with you, I have a 92 Ford 460 dually with an ac unit converted from R12 to R134. I plan on recharging it, should I evacuate it and put in new 134? How would I convert R12 instructions to 134?

Thank you, Thank you, and Thank you!
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Wednesday, September 18th, 2024 AT 3:53 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Lol you should be okay, Thank you for the consideration.

https://www.paypal.com/ncp/payment/VTBAJSABCQ2CN

Our pleasure, let us know how it goes or if you need anymore help. Sorry, we only handle one problem per thread, please post your new question here, you must be logged in.

https://www.2carpros.com/questions/new

Cheers, Ken
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Thursday, September 19th, 2024 AT 9:35 AM
Tiny
JOE IANNIELLO
  • MEMBER
  • 14 POSTS
$40 sent. Thank you.
How should I handle an old R12 system converted to R134.
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Thursday, September 19th, 2024 AT 11:36 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Wow, thank you Joe! Please start a new question. We only handle one problem per thread, please post your new question here, you must be logged in.

https://www.2carpros.com/questions/new

Cheers, Ken
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Friday, September 20th, 2024 AT 9:33 AM

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