1985 AC fuse
Thread Starter
2nd Gear
Joined: May 2009
Posts: 2
Likes: 0
1985 AC fuse
Good morning all:
Have a 1985 with AC issues.
Keeps blowing the fuse at random times.
Tried a higher amperage fuse but it still blows a random times.
Any advice?
Thanks in advance
"Taxation WITH representation isn't so hot either"
Have a 1985 with AC issues.
Keeps blowing the fuse at random times.
Tried a higher amperage fuse but it still blows a random times.
Any advice?
Thanks in advance
"Taxation WITH representation isn't so hot either"
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
Probably a shorted clutch coil - quit trying a higher rated fuse! Check wiring at the clutch; diode (should be in the Connector or close to it) - replace coil - though they're about a third of the cost of a new compressor so you might just replace the whole unit.
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
Should be some resistance across the Leads. I forget the exact #, but you might ask on the board here: www.ackits.com or review their tip here: http://www.autoacforum.com/messagevi...threadid=14950 (though you allready know that it's blowing the fuse)The Diode should only show a completed circuit towards ground. If it's closed on both, the juice can flow back through the Coil and short out other components.
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
NEVER install a higher current fuse! Clutch coils are very low resistance and most test ohmeters won't accurately read low enough to tell a short from the coil resistance. Besides, if it is your clutch coil, it isn't shorted all the time and you would need to measure the coil when it does short....very unlikely. Another reason why the fuse blows is a chaffed wire that goes to the clutch coil shorts to nearby metal occassionally which blows the fuse.
Check the wires connected after the fuse for cut insulation and if none found, the clutch coil is suspect. Keep in mind that the a/c fuse supplies power to a/c control switch, to two pressure switches, to the ECM, and to the clutch coil. All of these wires need to be inspected.
Not always, but usually when a clutch coil shorts, it stays shorted.
Check the wires connected after the fuse for cut insulation and if none found, the clutch coil is suspect. Keep in mind that the a/c fuse supplies power to a/c control switch, to two pressure switches, to the ECM, and to the clutch coil. All of these wires need to be inspected.
Not always, but usually when a clutch coil shorts, it stays shorted.
