Blowing fuses when using the front heater??

Post by **fergus77** » 26 Feb 2008, 21:08

Another heater question.

running a diesel 1Y and the cab heater under the dash never worked. Took the dash out and checked the heater motor wasn't siezed, which it wasn't, so repaired the earth wire on the earth block under the dash, which seemed a bit fried. Now, things worked perfectly till the other day when using the wipers and the heater the fuse blow. Replaced the fuse thinking it was a leak hitting the earth block which it wasn't, and now it still doing it. this time i just left the heater running and after about 30 seconds it blow again!!

Does anybody know what to start checking to resolve the problem? All the earth conectors on the earth block were cleaned and tightened before the dash went back in.

Any ideas peeps??

Post by **Louey** » 26 Feb 2008, 22:27

I think a blowing fuse could be a live wire shorting on something - check the wires you have been messing with and look for any breaks that might be shorting on the bodywork

Post by **fergus77** » 27 Feb 2008, 07:57

Cheers for that louey.

take it that the short maybe along the same circuit as the heater and wipers, and not along another circuit?

looks like dash out again!!

Post by **fergus77** » 27 Feb 2008, 08:04

Forgot to mention, there's a smaller rear heater under the bench seat wit the main feed scotch locked from the main feed from the front heater. Do you think problems could arise from that set up?

Post by **skell** » 27 Feb 2008, 18:51

Mine did similar recently, turned out the heater switch was knackered and connecting all the outputs at once, hence to much current was drawn and fuse kept on blowing. Pull the swith out and check it with a multimeter.

Post by **skell** » 27 Feb 2008, 18:52

ps scotch locks are the work of the devil, get rid and wire the rear heater in properly...

Post by **fergus77** » 27 Feb 2008, 21:33

Good call Skell.

when you mentioned checking the switch, what am i looking for with the multimeter? Already checked it when i thought the blower was broken, and all settings seemed to be right. Am i looking for an increase in voltage or something?

The heater decided to blow the fuse without the wipers on yesterday, and the wipers were running 100% before hand, so i'm thinking all the probs lay with the heater and wireing to the thing.

Will get the dash out tomorrow hopefully and see whats what

Post by **skell** » 28 Feb 2008, 12:25

Check that only one output from the switch is connected to the input at once, I found that when I turned it on more than one output was connected at once

Post by **fergus77** » 28 Feb 2008, 13:46

Nice one, will be checking that out after i get the soil, bits of plant pot and shattered windscreen out of the cab!!

Some fecker through it through my windscreen last night!!

Gave him a good filling in thou before the police landed and arrested him...

Ye don't mess with the VW crowd

Post by **VWlewis** » 28 Feb 2008, 14:49

Well you will have a nice new windscreen - make sure you ask for one with a green sun filter strip across the top... I did ... and it is very useful!

See photo in link below

http://archive.club8090.co.uk/garage.ph ... ge_id=1071

VW Lewis

Post by **ELVIS** » 28 Feb 2008, 15:25

switch is about £5 from GSF

Post by **fergus77** » 28 Feb 2008, 20:07

Cheers guys, green tinted screen already ordered and should be fitted tomorrow, so will be getting the fan switch checked, and glass out of the air vents!