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Posted

AC suddenly stopped blowing cold. I pop the hood and see this...

 

1728847058_ratnest.jpg.841affc99ced29dd7d540943d7f52be2.jpg

696806039_ratnest2.jpg.e024a63b2a7e4b4d2894add01838a080.jpg

 

sitting right on top of AC compressor.

 

Cleaned the nest off:

1834996578_engineminusratnest.jpg.688fb61d6eb5c1b933509b5601aeb164.jpg

 

 You can see where the dirty black insulation has been chewed off revealing a white area underneath (between the red connector and the compressor). The white has been chewed slightly, but doesn't appear to be chewed through. Running outside of that insulation are two small wires that have been completely chewed in half.

 

Here are the two chewed wires up close (one blue one black):

 

1875752168_chewedwires.jpg.68b30fa22349fca1179474ec893957ef.jpg

 

and

 

1281773780_chewedwires2.jpg.bc9e8034c729bd159b4a0475a2500e42.jpg

 

The AC seems to be working fine, its just not blowing cold. The compressor is turning on when I turn on the AC, the blower works, the AC clutch is engaging. Could those two tiny ass wires be the problem? Or did the fucking rat chew a hole somewhere and all my freon is gone?

 

One last pic. This is where the white shit came from:

216030495_strippedoutinsulation.jpg.881b1a14d398611ef182277462f88373.jpg

 

Questions:
 

1. If I just wrap that exposed white in electrical tape, and splice in some wire to reconnect those two chewed wires and wrap those, am I risking screwing up something even worse?

2. Should i just recharge the freon and see what happens? You can see the recharge port in the lower left of the last pic.

3. If the fucking rat did chew a hole somewhere, and the freon is leaking out, is there anyway to easily find the hole?

 

This is the wife's car. No AC is not an option. I'd rather not spend a shit ton of money if possible.

 

Posted

Check every wire on the a/c system. If they've been chewed, they need replaced. Rodents are the ultimate pita because they will go places you can't see or reach and chow down on wires.

Posted

Start with the easy stuff. The wires need to be replaced anyway, so take care of that and hopefully it solves the problem. Every time I’ve tried to recharge Freon I’ve overdone it because the gauges on those DIY kits suck, but might be worth it to pick up a pressure tester or leak detector. I wouldn’t underestimate a rats ability to chew through anything.

Posted
  On 9/22/2020 at 5:05 AM, TwiceHorn said:

Oddball engine compartment.  Subaru?

I can't figure what those wires might control there at the compressor, other than the clutch.

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Yeah, fucking subarus (no lesbian). engine and transmission run great (approaching 200K miles) but everything else is falling apart. AC clutch seems to be working. I have no idea on the wires. Extensive googling is no help. I think I can replace the wires with some shady shade tree rig job, and see what happens.

I do like the oil filter sitting right up top. I don't even need a oil filter wrench to get it off.

Posted
  On 9/22/2020 at 1:51 PM, SquishMitten said:

Start with the easy stuff. The wires need to be replaced anyway, so take care of that and hopefully it solves the problem. Every time I’ve tried to recharge Freon I’ve overdone it because the gauges on those DIY kits suck, but might be worth it to pick up a pressure tester or leak detector. I wouldn’t underestimate a rats ability to chew through anything.

Expand  

 

How much we talking here?

 

Posted (edited)
  On 9/22/2020 at 3:05 PM, High Plains Drifter said:

I have no idea on the wires

Expand  

You should be able to Google [year] Subaru [model] ac wiring diagram to figure out what the wires go to.  Most diagrams will identify the wires by color.

As an example:

spacer.png

 

ETA:  I'm a Google/YouTube certified mechanic.

Edited by Jerry Callo
  • Hook 'Em 1
Posted

From futzing around, it looks like the black thing actually on the compressor is a pressure sensor (to which the chewed black wire may lead).  That feeds into the ECU/AC controller and starts/stops the clutch/compressor depending on conditions in the compressor.  There are some other things that feed into the ECU to control the clutch/compressor  and electric fan and idle speed, etc.

None of them, however, would seem to account for a complete absence of cold air.  Intermittent operation, yes.

Are you getting hot air?  Blend door maybe?

Posted

Fucking rats caused us to blow an engine on our Explorer.  Chewed some wires, caused some misfirings and blew the engine.  Had to replace.  Fortunately the mechanic found a Mercury Mariner (same engine) that had been totaled but the engine was fine.  Still cost $3,500, but better than the $8,000 we were quoted.

Posted

Rodents will fuck shit up overnight. The only defense is dogs or parking indoors. Wire insulation and copper are like crack to them. Squirrels are the worst. They will gnaw through 4" wire harnesses and hunt for more.

Posted
  On 9/22/2020 at 6:02 PM, RPM said:

Rodents will fuck shit up overnight. The only defense is dogs or parking indoors. Wire insulation and copper are like crack to them. Squirrels are the worst. They will gnaw through 4" wire harnesses and hunt for more.

Expand  

Hunters at a ranch in South Texas used to park their trucks with the hood up and never had any rodent problems out in the country. That removes a covered, dark, and cozy spot for them.

  • Hook 'Em 1
  • Like 1
  • Fuck You 1
Posted

Since the wires are already fucked, just cut and strip them and run jumpers between them to see if it solves your problem.  You have to fix them either way, so you might as well figure out if that's your problem before you go any further.

Posted
  On 9/22/2020 at 3:44 PM, Jerry Callo said:

You should be able to Google [year] Subaru [model] ac wiring diagram to figure out what the wires go to.  Most diagrams will identify the wires by color.

As an example:

ETA:  I'm a Google/YouTube certified mechanic.

Expand  

 

Thanks, I'll do that when I get some time.

 

 

  On 9/22/2020 at 5:24 PM, TwiceHorn said:

From futzing around, it looks like the black thing actually on the compressor is a pressure sensor (to which the chewed black wire may lead).  That feeds into the ECU/AC controller and starts/stops the clutch/compressor depending on conditions in the compressor.  There are some other things that feed into the ECU to control the clutch/compressor  and electric fan and idle speed, etc.

None of them, however, would seem to account for a complete absence of cold air.  Intermittent operation, yes.

Are you getting hot air?  Blend door maybe?

Expand  

 

Yeah, hot air works fine. not sure what "blend door" means.

 

  On 9/23/2020 at 12:53 AM, MagicSoccerSpray said:

Hunters at a ranch in South Texas used to park their trucks with the hood up and never had any rodent problems out in the country. That removes a covered, dark, and cozy spot for them.

Expand  

 

Thanks, i might start doing that as we have covered parking.

 

  On 9/23/2020 at 2:58 AM, Assman said:

Since the wires are already fucked, just cut and strip them and run jumpers between them to see if it solves your problem.  You have to fix them either way, so you might as well figure out if that's your problem before you go any further.

Expand  

 

I was planning on doing that as soon as I get some free time. Probably this weekend.

 

 

Thanks for all the feedback, fellas.

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