Troubleshooting the AC A/C system (fuses, etc)
12-26-2013, 06:52 PM
#16
Banned
Thread Starter
Join Date: Oct 2012
Location: USA
Posts: 1,744
Likes: 0
Received 2 Likes
on
2 Posts
Year: 1998
Model: Cherokee
Engine: 4.0L i6
I have a question about checking the AC fuses.
There are 2 things listed:
Engine Bay Fuse Box (PDC)
AC Compressor Clutch Relay
Fuse #9 AC Clutch Relay
But, in the diagram, Fuse #9 redirects you to Fuse #27.
But fuse #27 is "sentry key immoibilzer"
Why would Fuse #9 refer to another fuse?
What does that even mean?
Engine Bay Fuse Box (PDC)
There are 2 things listed:
Engine Bay Fuse Box (PDC)
AC Compressor Clutch Relay
Fuse #9 AC Clutch Relay
But, in the diagram, Fuse #9 redirects you to Fuse #27.
But fuse #27 is "sentry key immoibilzer"
Why would Fuse #9 refer to another fuse?
What does that even mean?
Engine Bay Fuse Box (PDC)
12-26-2013, 07:10 PM
#17
CF Veteran
Join Date: Aug 2010
Location: Canton, MI
Posts: 8,357
Likes: 0
Received 90 Likes
on
74 Posts
Year: 1999
Model: Cherokee
Engine: 4.0
Fuse F9 not only feeds the AC Compressor Clutch Relay circuit, it also feeds fuse F27, B+ at the SKIM.
That list should read "Fuse 9 A/C Clutch Relay + Fuse 27 in PDC".
That list should read "Fuse 9 A/C Clutch Relay + Fuse 27 in PDC".
12-26-2013, 09:50 PM
#19
CF Veteran
Join Date: Aug 2010
Location: Canton, MI
Posts: 8,357
Likes: 0
Received 90 Likes
on
74 Posts
Year: 1999
Model: Cherokee
Engine: 4.0
Like so if I am not mistaken....
Attachment 224907
Attachment 224907
What program did you use to mark up that diagram?
12-26-2013, 10:14 PM
#20
::CF Administrator::
12-26-2013, 11:49 PM
#21
Banned
Thread Starter
Join Date: Oct 2012
Location: USA
Posts: 1,744
Likes: 0
Received 2 Likes
on
2 Posts
Year: 1998
Model: Cherokee
Engine: 4.0L i6
Nice diagram!
Anyone know what kind of relay I need to shop for if I want to replace it?
What is the science behind a fuse feeding power (or being chained) to another fuse?
Anyone know what kind of relay I need to shop for if I want to replace it?
What is the science behind a fuse feeding power (or being chained) to another fuse?
12-27-2013, 09:53 AM
#23
::CF Administrator::
No real science at all. Every circuit has a fuse. They just chose to piggyback a lower amp and rarely used circuit off the power for the A/C clutch relay.
12-27-2013, 10:47 AM
#24
CF Veteran
Join Date: Aug 2010
Location: Canton, MI
Posts: 8,357
Likes: 0
Received 90 Likes
on
74 Posts
Year: 1999
Model: Cherokee
Engine: 4.0
Science? Electrical engineering.
Note that the fuse Amp rating gets smaller downstream. If the circuit for the downstream fuse shorts it will blow that fuse before getting to the upstream fuse.
12-27-2013, 01:35 PM
#29
::CF Administrator::
I am going try to test the relay.
Just need to buy some test leads.
Auto Repair & Mechanics : How to Test a Car Relay - YouTube
Just need to buy some test leads.
Auto Repair & Mechanics : How to Test a Car Relay - YouTube
LOL
