Cooling Fan Fuse
#1
Instructor
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Member Since: Aug 2006
Location: St. Louis MO
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Cooling Fan Fuse
Was driving to work today and the temp got up to 240 right before I shut the engine off. I opened the hood and found the fuse blown. When I attempted to replace the fuse it shattered into small pieces. After digging out most of the fuse body I found that it was melted into the fuse block. Anyone had this happen? I checked the connection at the radiator and that plug is fine. I can't see any other bare wires or other causes. Was able to get a new fuse into the socket and the fans still run. Not sure what I will find when I get home and investigate farther.
#2
Tech Contributor
Have you changed the fan settings?
That is a high current circuit when fans are full on (~30 amp) so some corrosion or loose connection of the fuse leads/fuse socket could cause heat at the connection due to the added resistance and be the cause.
Changing the fuse is probably enough but I'd try hitting the contacts with some contact cleaner and then insert/remove the fuse a few times to clean the connection that fried.
That is a high current circuit when fans are full on (~30 amp) so some corrosion or loose connection of the fuse leads/fuse socket could cause heat at the connection due to the added resistance and be the cause.
Changing the fuse is probably enough but I'd try hitting the contacts with some contact cleaner and then insert/remove the fuse a few times to clean the connection that fried.
#3
Team Owner
Clean those contacts well and also examine them carefully and make sure they are nice and flat and parallel to eachother. You want as much surface area for the connection as possible. Nice flat clean surfaces facing eachother.
#5
Burning Brakes
#6
Was driving to work today and the temp got up to 240 right before I shut the engine off. I opened the hood and found the fuse blown. When I attempted to replace the fuse it shattered into small pieces. After digging out most of the fuse body I found that it was melted into the fuse block. Anyone had this happen? I checked the connection at the radiator and that plug is fine. I can't see any other bare wires or other causes. Was able to get a new fuse into the socket and the fans still run. Not sure what I will find when I get home and investigate farther.
Might want check the front of the radiator for debris that may be causing lack of air flow, hence what may have caused the runaway on the heat problem to kick the fan into full on too long to cause the fan fuse to blow in the first place.
Also, would be a good time to check the radiator wire connect just before the fan to make sure that it did not melt as well.