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Author: Subject: Cooling Fan Fuse Melting
lordbenny

posted on 8/5/18 at 03:46 PM Reply With Quote
Cooling Fan Fuse Melting

So, it’s been pretty hot out lately and after a good blat yesterday I removed my bonnet and noticed the cooling fan fuse had melted! Not blown just melted....why would this be?

I also tried to start the car at one point yesterday and got....nothing, after the car had cooled for a while it started again. It’s a Zetec powered Westfield with an MT75 gearbox. Could this be heat soaking and the starter getting too hot (the starter is very close to one in the primary pipes that I have exhaust wrapped to try to prevent this happening) If so how to I conquer this?

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gremlin1234

posted on 8/5/18 at 04:08 PM Reply With Quote
what value was the fuse (before it melted?)

do you have a pic of it?

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lordbenny

posted on 8/5/18 at 04:14 PM Reply With Quote
It was red...The plastic melted, I binned it!

Should it be 20amp...in which case isn’t that yellow?

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nick205

posted on 8/5/18 at 04:17 PM Reply With Quote
Assume you're running fuel injection?

I ask, because my father in laws carbed car used to not start in hot weather after a run. After much faffing it appeared to be fuel evaporating in the carb and leaving nothing for the engine to start with.

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lordbenny

posted on 8/5/18 at 04:21 PM Reply With Quote
quote:
Originally posted by nick205
Assume you're running fuel injection?

I ask, because my father in laws carbed car used to not start in hot weather after a run. After much faffing it appeared to be fuel evaporating in the carb and leaving nothing for the engine to start with.


It’s on carbs....

I’m sure it’s not fuel...it doesn’t even click when the starter button is pressed. Once cooled down it’s ok.

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gremlin1234

posted on 8/5/18 at 04:42 PM Reply With Quote
quote:
Originally posted by lordbenny
Should it be 20amp...in which case isn’t that yellow?

red is 10A
20A is yellow

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lordbenny

posted on 8/5/18 at 04:45 PM Reply With Quote
quote:
Originally posted by gremlin1234
quote:
Originally posted by lordbenny
Should it be 20amp...in which case isn’t that yellow?

red is 10A
20A is yellow


So, if I’ve change to a yellow from a red would it be less likely to melt?

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theduck

posted on 8/5/18 at 05:04 PM Reply With Quote
It shouldn’t have melted in the first place, melting suggests poor contact causing resistance causing heat
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DW100

posted on 8/5/18 at 05:05 PM Reply With Quote
No

The melting is likely to be heat produced by a poor contact in the fuse holder.

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lordbenny

posted on 8/5/18 at 05:11 PM Reply With Quote
Ok, so I’ve crimped the holder connectors together and filed the fuse pins....let’s see if that does the trick!
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gremlin1234

posted on 8/5/18 at 05:44 PM Reply With Quote
quote:
Originally posted by lordbenny
Ok, so I’ve crimped the holder connectors together and filed the fuse pins....let’s see if that does the trick!
next thing to do is put a mulimeter in circuit, to see what the actual current demand is.

note never up-rate the fuse just because it fails, unless you are confident that the rest of the wiring is designed to take the load, and you understand why its drawing so much.

[Edited on 8/5/18 by gremlin1234]

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