2009 Civic, a/c won't work
Thread Starter
Registered!!
Joined: Jun 2018
Posts: 1
Likes: 0
Rep Power: 0 
2009 Civic, a/c won't work
I have a 2009 Civic dx
A/C won't work, Tried checking all fuses and switched relays under the hood. I have three red wires at harness by alternator going down to compressor, If I put probe on battery negative side and probe a red wire, 2 out of the 3 times the a/c will start working and the two fans come on by radiator. The other red wire. nothing happens.
Does this have something to do with a thermal protector?
I know nothing about a/c units, so any help on how to fix would be appreciated.
A/C won't work, Tried checking all fuses and switched relays under the hood. I have three red wires at harness by alternator going down to compressor, If I put probe on battery negative side and probe a red wire, 2 out of the 3 times the a/c will start working and the two fans come on by radiator. The other red wire. nothing happens.
Does this have something to do with a thermal protector?
I know nothing about a/c units, so any help on how to fix would be appreciated.
If you think a good mechanic is expensive, try hiring a bad one
Joined: Dec 2011
Posts: 32,017
Likes: 256
From: Midwest. Aiming about mid-chest
Rep Power: 517 
Re: 2009 Civic, a/c won't work
#1, don't probe anything if you have no idea what you are doing. You can damage expensive electronics in a hurry. Then you'll be faced with a whole bunch of new problems in addition to the original problem
Does the system have sufficient pressure inside it to initiate compressor operation in the first place?
When you try to run the AC, do both radiator fans turn on? Or no?
If no:
Unplug the 3 wire connection on top of the alternator again.
Ohm check the two outer red wires of the 3 wire plug leading down to the compressor. If they measure as open circuit then replace the thermal protector.
Does the system have sufficient pressure inside it to initiate compressor operation in the first place?
When you try to run the AC, do both radiator fans turn on? Or no?
If no:
Unplug the 3 wire connection on top of the alternator again.
Ohm check the two outer red wires of the 3 wire plug leading down to the compressor. If they measure as open circuit then replace the thermal protector.
Thread
Thread Starter
Honda Civic Forum
Replies
Last Post
SeanA
Electrical, Wiring, and In Car Entertainment
1
Jun 18, 2017 12:20 AM
carguy200550
Mechanical Problems/Vehicle Issues and Fix-it Forum
3
May 3, 2014 04:05 PM
