73 AC Compressor Won't Engage
Thread Starter
Racer
Joined: Apr 2004
Posts: 336
Likes: 0
From: Tucson
Randy , where does A go and what does the loose end look like ?
...................
Lets talk about B in your pic. B is the thermal fuse and its probably blown.Try this to start.
Unplug B from the connector
start the engine and turn the AC on
in the connect there should be 2 dk green wires
use a paper clip and jumper the 2 dk green wires momentarily to see if comp kicks on,pull clip out if comp comes on
(hopefully the wires are plugged in at the comp)
...................
Lets talk about B in your pic. B is the thermal fuse and its probably blown.Try this to start.
Unplug B from the connector
start the engine and turn the AC on
in the connect there should be 2 dk green wires
use a paper clip and jumper the 2 dk green wires momentarily to see if comp kicks on,pull clip out if comp comes on
(hopefully the wires are plugged in at the comp)
That's for the superheat switch on the back of the compressor.
If the compressor gets over 140° then it will trip that wire to ground and blow the thermal limiter (like a fusable link) at the 3 prong connecter .
In short, that circuit must be good to have power to the a6 clutch.
Hope that makes sense to you.
If the compressor gets over 140° then it will trip that wire to ground and blow the thermal limiter (like a fusable link) at the 3 prong connecter .
In short, that circuit must be good to have power to the a6 clutch.
Hope that makes sense to you.
Noonie - I pulled the thermal fuse and tried the paperclip idea without success, possibly because of the loose wire. I also pulled the thermal fuse and am getting 8.8 ohms across it. Is that the correct spec?
Last edited by Ran-D; May 30, 2011 at 01:22 PM.
Thread Starter
Racer
Joined: Apr 2004
Posts: 336
Likes: 0
From: Tucson
Can anyone tell me where the other end of wire label "A" in the linked picture is supposed to go???
http://rides.webshots.com/photo/2269...67542063RGfORK
http://rides.webshots.com/photo/2269...67542063RGfORK
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
I'm sure I can find it on the diagram.
What color is the A wire ? It appears to be dk green but changes to black ?The end that is connected,what is it connected to ? Does it go to the thermal fuse connector ?
What color is the A wire ? It appears to be dk green but changes to black ?The end that is connected,what is it connected to ? Does it go to the thermal fuse connector ?
Thread Starter
Racer
Joined: Apr 2004
Posts: 336
Likes: 0
From: Tucson
http://rides.webshots.com/photo/2355...67542063NMigis
The wire is green on both side of the "A" connector. To the left of the connector, there is 2 inches of green wire exposed that comes out of the wiring harness at "B". This harness runs in back of the distributor cap, by the windshield wiper spritzer pump ("C"). There is 2 feet of green wire ("D"), on the right side of the connector "A". This is the loose end, and just laying there in the picture. I see no connectors within the 2 feet. Maybe more of the wire is gone, who knows. "E" is the thermal fuse.
Last edited by Ran-D; May 31, 2011 at 01:47 AM.
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
The loose one appears to be TCS wiring.
........................................ .....................
Lets move beyond the mystery wire.
Do you know where the 2 wire ambient sensor is on the evaporator case ?
If you can find that,use your test light to see if either wire is hot with AC on.
........................................ .....................
Lets move beyond the mystery wire.
Do you know where the 2 wire ambient sensor is on the evaporator case ?
If you can find that,use your test light to see if either wire is hot with AC on.
Thread Starter
Racer
Joined: Apr 2004
Posts: 336
Likes: 0
From: Tucson
The loose one appears to be TCS wiring.
........................................ .....................
Lets move beyond the mystery wire.
Do you know where the 2 wire ambient sensor is on the evaporator case ?
If you can find that,use your test light to see if either wire is hot with AC on.
........................................ .....................
Lets move beyond the mystery wire.
Do you know where the 2 wire ambient sensor is on the evaporator case ?
If you can find that,use your test light to see if either wire is hot with AC on.
Now you gotta get your test light out. The center dk green wire in the thermal fuse connector needs to be hot when the AC is on..
Last edited by Ran-D; Jun 2, 2011 at 09:13 PM.
