Notices
Evo General Discuss any generalized technical Evo related topics that may not fit into the other forums. Please do not post tech and rumor threads here.
Sponsored by: RavSpec - JDM Wheels Central

Need help, no power going to ac compressor (evo 8)

 
Old Jul 12, 2019, 03:21 PM
  #1  
Evolving Member
Thread Starter
iTrader: (8)
 
Join Date: Nov 2011
Location: NY
Posts: 261
Received 4 Likes on 4 Posts
Need help, no power going to ac compressor (evo 8)

Hay guys I was outside this evening trying to recharge my ac system. I would turn the ac on in the car and the compressor would not kick on. To keep a long story short, I ran a jumper wire from the positive terminal to the ac compressor and the compressor came on. I checked the wire that goes to the compressor with my test light while the car was on and got nothing. I checked all the fuses and swapped all the relays.
Does anyone have any idea why the wire that goes to the compressor would not be getting power?

Thanks in advance!!!
Ude Lose is offline  
Old Jul 12, 2019, 05:04 PM
  #2  
Evolved Member
 
Biggiesacks's Avatar
 
Join Date: Aug 2005
Location: The Bay Area
Posts: 3,601
Received 239 Likes on 224 Posts
too much pressure on the high side or not enough pressure on the low side. Or maybe an issue with the pressure switch itself or associated wiring.
Biggiesacks is offline  
Old Jul 12, 2019, 05:30 PM
  #3  
Evolving Member
Thread Starter
iTrader: (8)
 
Join Date: Nov 2011
Location: NY
Posts: 261
Received 4 Likes on 4 Posts
Would either symptom cause no voltage to the wire what so ever?
Ude Lose is offline  
Old Jul 12, 2019, 05:39 PM
  #4  
Evolved Member
 
Biggiesacks's Avatar
 
Join Date: Aug 2005
Location: The Bay Area
Posts: 3,601
Received 239 Likes on 224 Posts
Originally Posted by Ude Lose View Post
Would either symptom cause no voltage to the wire what so ever?
Yes the ecu won't send a signal if it's not getting a read through the pressure switch
Biggiesacks is offline  
Old Jul 13, 2019, 05:55 AM
  #5  
Evolving Member
Thread Starter
iTrader: (8)
 
Join Date: Nov 2011
Location: NY
Posts: 261
Received 4 Likes on 4 Posts
Ok very good.

I'll try to check the pressure on each side.

Thanks!
Ude Lose is offline  
Old Jul 13, 2019, 08:00 AM
  #6  
Evolving Member
Thread Starter
iTrader: (8)
 
Join Date: Nov 2011
Location: NY
Posts: 261
Received 4 Likes on 4 Posts
I just checked the high side and low side and there is no pressure in either side and the wire still will not get power.
Ude Lose is offline  
Old Jul 13, 2019, 08:45 AM
  #7  
Evolved Member
 
Biggiesacks's Avatar
 
Join Date: Aug 2005
Location: The Bay Area
Posts: 3,601
Received 239 Likes on 224 Posts
Originally Posted by Ude Lose View Post
I just checked the high side and low side and there is no pressure in either side and the wire still will not get power.
Well thats your problem. If you have no pressure your system is empty. You said you just refilled your system right? That's usually only necessary if you have a leak.
Biggiesacks is offline  
Old Jul 13, 2019, 11:06 AM
  #8  
Evolving Member
 
Fox_IX's Avatar
 
Join Date: Dec 2015
Location: HWY 9
Posts: 348
Received 23 Likes on 22 Posts
Originally Posted by Biggiesacks View Post
Well thats your problem. If you have no pressure your system is empty. You said you just refilled your system right? That's usually only necessary if you have a leak.
Time to break out the tracer dye! :P
Fox_IX is offline  
Old Jul 13, 2019, 12:04 PM
  #9  
Evolving Member
Thread Starter
iTrader: (8)
 
Join Date: Nov 2011
Location: NY
Posts: 261
Received 4 Likes on 4 Posts
Originally Posted by Biggiesacks View Post
Well thats your problem. If you have no pressure your system is empty. You said you just refilled your system right? That's usually only necessary if you have a leak.
Well I tried to refill it and the wire would not get any power going to it.

When I jumped a wire from the positive terminal the clutch kicked on.
Ude Lose is offline  
Old Jul 13, 2019, 12:08 PM
  #10  
Evolving Member
 
Fox_IX's Avatar
 
Join Date: Dec 2015
Location: HWY 9
Posts: 348
Received 23 Likes on 22 Posts
Originally Posted by Ude Lose View Post
Well I tried to refill it and the wire would not get any power going to it.

When I jumped a wire from the positive terminal the clutch kicked on.
Do you have an r134 manifold gauge set? What are your low and high side pressures? You may be overfilled tbh. Either condition will not allow compressor to run . DO NOT force the compressor to run until you know you're not high or low on refrigerant, that's an awesome way to grenade the pump.

If you're 10000% sure you have the correct level of refrigerant then look into replacing the pressure switch. This will require you to recover the existing r410 and recharge.
Fox_IX is offline  
Old Jul 13, 2019, 02:16 PM
  #11  
Evolving Member
Thread Starter
iTrader: (8)
 
Join Date: Nov 2011
Location: NY
Posts: 261
Received 4 Likes on 4 Posts
I dont have a r134 manifold gauge but my buddy is bringing his by tomorrow.
I took off the high and low caps and manual pushed in the release pin and absolutely nothing came out of each side.
Ude Lose is offline  
Old Jul 13, 2019, 03:35 PM
  #12  
Evolved Member
iTrader: (1)
 
Lumpy Sticks's Avatar
 
Join Date: Sep 2018
Location: CA/AZ
Posts: 506
Likes: 0
Received 49 Likes on 45 Posts
Then you have no freon in the system. You will need to pull a vacuum on the system before it gets recharged. When you start filling the system, the compressor should kick on when it gets enough freon. I typically use the little bottles from Autozone to fill systems at home. You just need an adapter so you can hook it up to the gauges your buddy has. Be sure to look at the sticker in the engine compartment to see how much you need to add in oz.

Looks like this.

Lumpy Sticks is offline  
Old Jul 13, 2019, 04:27 PM
  #13  
Evolving Member
Thread Starter
iTrader: (8)
 
Join Date: Nov 2011
Location: NY
Posts: 261
Received 4 Likes on 4 Posts
Ok sounds good, I will try it tomorrow and report back.
Thanks!
Ude Lose is offline  
Old Jul 13, 2019, 06:48 PM
  #14  
Evolved Member
 
Bhsj13's Avatar
 
Join Date: Oct 2013
Location: United States
Posts: 1,290
Likes: 0
Received 22 Likes on 22 Posts
make sure you pull a vacuum on the system. air and non condensable gasses are no good for a a/c refrigerant system. also, as said earlier did you check to ensure you dont have a leak somewhere?
Bhsj13 is offline  
Old Jul 15, 2019, 06:42 PM
  #15  
Evolving Member
Thread Starter
iTrader: (8)
 
Join Date: Nov 2011
Location: NY
Posts: 261
Received 4 Likes on 4 Posts
Yes I checked for leaks and did not find any...
Ude Lose is offline  

Thread Tools
Search this Thread

Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.