Fans won't turn on..
Thread Starter
Drifting
Joined: Jan 2008
Posts: 1,752
Likes: 62
From: New Madison Ohio
Fans won't turn on..
I checked the fuse and it was blown. I put in a new fuse and before I can push it all the way in it blows. I believe I have short some where. I guess my question is if the relay goes bad can it blow the fuse? Any help would be appreciated...thanks...
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 206
From: Orlando FL
I would not think the contact portion of the relay would cause this problem, but if the diode across the coil shorted, it then might cause the fuse to blow.
I would just pull the relay and measure the coil resistance. I don’t know what the coil resistance is offhand, but a reading of (about) less than 5 ohms would be suspicious. You also have to measure the coil in both directions. If the reading is the same and low, that would also indicate a problem.
Or, pull the relay out and see if the fuse blows. I don’t have the exact schematic for the 84 so I can't take you much further.
I would just pull the relay and measure the coil resistance. I don’t know what the coil resistance is offhand, but a reading of (about) less than 5 ohms would be suspicious. You also have to measure the coil in both directions. If the reading is the same and low, that would also indicate a problem.
Or, pull the relay out and see if the fuse blows. I don’t have the exact schematic for the 84 so I can't take you much further.
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
The coolant fan fuse powers the fan relay coil AND the voltage regulator inside the alternator. Unplug the alternator and install another fan fuse and see if it survives. If it does, then the problem is a shorted voltage regulator inside the alternator. You can replace the regulator yourself. If the fuse still blows without the alternator plugged in, then unplug the fan relay and try another fuse and if it blows, you have a wire somehow shorted to ground by being pinched somewhere or the insulation cut and touching ground.
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
Also, unplug the fan, and you should see around 25 ohms with a multimeter.
I don't think your problem is the fan. I'm guesing the real problem is upstream.
But first, see if the fan will rotate.
I don't think your problem is the fan. I'm guesing the real problem is upstream.
But first, see if the fan will rotate.
