dom_xr3i

i've got an escort gti and the fuses for the heater and also the fog lights keep melting but i dont have the fog lights on the car anymore cos i have changed the front bumper but the heater fuse only lasts a week before it melts

anyone have any ideas wot the problem could be? my father in law thinks the heater motor could be nakered cos it only works on the highest setting

please help thank you

cheers dom

stickertone

it could be drawing a high current due to the motor being screwed, this would also account for the motor ony working on high setting, check the amount of amperage the motor is drawing, i think you'll find its more than normal.. hence the fuse melting

rich123

iTrader: (3)

i had this its the plastic thats the problem cheap crap plastic i put some original fuses out of a ford and i have no problems anymore,sounds stupid but try it

botters

iTrader: (2)

mine kept melting fuses so i just ran a wire from the live on the battery to the heater motor! fire hazard i know but works well just a pain in the ass having to open bonnet to disconnect it!

xr2wishy

iTrader: (2)

i had my fuse box melt a bit back due to rad fan being seized and didn't blow fuse, but melted the fuse box and plastic on the fuse.
try a smaller rating of fuse and or sort the fan out.

p.s. i know it's the demister fan in your case, but same applies.

RichieST

iTrader: (2)

Normally fuses melt due to a poor connection between fuse/holder, or a poor solder joint on the fuse holder. This would cause a heat build up. It wouldn't be drawing any more current as usual so the fuse wouldn't blow, but the poor connection would cause heat to build up, thus melting the fuse plastic. Have seen it a couple of times on audio installs, cleaned up the fuse holder and resoldered the holder properly, and problem solved.

dom_xr3i

cheers for the help

it requires a 25amp fuse but it pops straight away so i put a 30amp fuse in and it just melts i'll try some ford fuses

but what gets me is the fog light fuses melted but i dont have fog lights connected anyore since changing my front bumper to a wrc replica

tabetha

Heat is naturally produced whenever there is a flow of electrons or ions through EVERYTHING apart from superconductors.
The positive charge carriers are immobile in a car circuit(dc) and only the negatively charged electrons flow, using a rogowski meter will show a electric field is produced also.
It is of course true that the higher the resistance be it load or bad connection will result in more heat produced.
A much more famous problem on vaux's with melting RHS fuses/fusebox area, same thing as happened to cossie with the fan loom.
In short any fuse seeing a load from whatever source will produce heat, so something is still connected and drawing from that circuit
tabetha