|
Issues | Warranty | Recalls / TSB Problems, issues, recalls, TSBs |
|
Thread Tools | Search this Thread |
08-26-2023, 07:13 AM | #1 |
Junior Member
Join Date: Oct 2021
Drives: Cheap & Slow
Location: Washington
Posts: 1
Thanks: 0
Thanked 1 Time in 1 Post
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
AC Rattle at 2-2.5k rpm
I have this weird rattle when I have my ac on only at certain rpm’s. From 2-2.5k if the ac is on I hear a buzzing/rattling noise from the engine…. Any clues? I’ve replaced the belt tensioner, have new belts….
I did rebuild the car after I bought it from the insurance auction and I replaced the compressor and added 5fl oz of pag oil as well as 14fl oz of r134a. I also added in another 6ish fl oz during the summer because I thought maybe I didn’t add enough Freon when it was 110 degrees out but found the ACs on these kinda suck https://youtube.com/shorts/7DXuphqyS...p1-agCoAqwNSai |
The Following User Says Thank You to 96eighty For This Useful Post: | humfrz (08-26-2023) |
08-26-2023, 09:23 AM | #2 |
Senior Member
Join Date: Dec 2018
Drives: 2013 frs base
Location: central Virginia
Posts: 1,120
Thanks: 1,738
Thanked 934 Times in 479 Posts
Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
|
Can we assume that you prepped and charged the system properly?
|
The Following User Says Thank You to blsfrs For This Useful Post: | humfrz (08-26-2023) |
08-26-2023, 10:25 AM | #3 |
Professional Mechanic
Join Date: Apr 2010
Drives: 2017 86 6MT Oceanic
Location: Quebec, Canada
Posts: 789
Thanks: 17
Thanked 633 Times in 371 Posts
Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
|
That's why I tell people not to DIY AC, it's already a pain to deal with in a pro setting.
Did you replace components other than the compressor? New/rebuilt compressors usually have more oil in them than needed. You usually drain the old compressor into a measuring cup, note the quantity, drain the new compressor and add back the same amount that you drained from the old one. If you put in the compressor as-is + 5oz, and did you pull a vacuum before filling? Your system might be massively overfilled in oil, which is a massive pain in the butt to rectify and already a great debuff on performance, but it may also have worse performance on top of that from an improper fill without a vac pump. Further, What did you use EXACTLY to fill the refrigerant? Pure, unadulterated r134a or DIY bottles with "additives"? Those contain hydrocarbons and leak sealers that contaminate and clog modern condensers, which have much smaller passages than the old stuff they're intended to fix. |
The Following 4 Users Say Thank You to RZNT4R For This Useful Post: |
08-26-2023, 06:04 PM | #4 | |
Senior Member
Join Date: May 2013
Drives: 2013 FR-S, white, MT
Location: Puyallup, WA
Posts: 29,880
Thanks: 28,806
Thanked 31,852 Times in 16,436 Posts
Mentioned: 708 Post(s)
Tagged: 2 Thread(s)
|
Quote:
However, I have found out over the past 70 years of DIY tinkering with cars, when it comes to the AC, it's best left to the professionals. (Bubba says, in the PNW, you don't need the AC below 2500 RPM anyway, just leave off till you get up to speed - ) |
|
The Following User Says Thank You to humfrz For This Useful Post: | blsfrs (08-27-2023) |
08-27-2023, 10:41 AM | #5 |
Professional Mechanic
Join Date: Apr 2010
Drives: 2017 86 6MT Oceanic
Location: Quebec, Canada
Posts: 789
Thanks: 17
Thanked 633 Times in 371 Posts
Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
|
BTW, I was thinking back and I think I should expand a bit on my no-DIY stance on AC:
I'm not telling anyone to not repair their AC system themselves, you are allowed to, for example, change a compressor, condenser, and if you feel like taking out your dash, even changing the evaporator. But holy crap, please please please! have a professional 1) recover and empty the system before you do your work and 2) have a professional correctly leak check, evacuate and charge the system afterwards. For example, If you did it yourself and your system is now overfilled in oil by 7 ounces, the cost and hassle of rectifying that will wipe out all that you've saved DIYing the job in the first place. You can't just "empty oil" out of an AC system, there's no drain plug, you have to crack the seals in multiple spots, backwash it with solvent until all the oil is out and then add the correct factory fill of oil. You don't want to have to do that. Last edited by RZNT4R; 08-27-2023 at 02:26 PM. |
The Following 3 Users Say Thank You to RZNT4R For This Useful Post: |
|
|
Tags |
ac compressor, buzzing, rattle |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
BRZ AC Rattle? | Xman17 | Issues | Warranty | Recalls / TSB | 14 | 03-14-2018 02:20 PM |
Anyone else's 6MT a rattle box at low RPM? | Silver Ignition | Scion FR-S / Toyota 86 GT86 General Forum | 81 | 05-29-2014 11:56 PM |
Rattle above 5k rpm | trippinbillies40 | Issues | Warranty | Recalls / TSB | 1 | 05-28-2014 02:55 PM |
AC Rattle | AVodka14 | Issues | Warranty | Recalls / TSB | 8 | 05-21-2014 12:08 PM |
A/C Rattle? | djliquidsteele | Scion FR-S / Toyota 86 GT86 General Forum | 2 | 06-17-2012 07:46 PM |