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jopather
Joined: 16 Jun 2005
Posts: 58
Location: California
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 Posted: Mon Jun 19, 2006 1:35 pm Post subject: more electrical questions |
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I'm trying to figure out why my fan blower motor randomly quit working. In the process, several questions have arisen.
First question is an "identification" question - does anyone know what the little box with three spade lugs on it is that is tucked up underneath the dash over on the passenger wall? I haven't found any reference to it in my manual or any of the schematics...
Second, I traced the continuity through that switch with settings 0-4 on it. It seems to be working correctly - so if that works and if I have voltage across my fuse #10 and my fan blower relay works with 12 volts, then is it just my blower motor and I'm out of luck?
Finally, those stupid fuses - is there any sort of replacement for those things? They get corroded so quickly. I'm getting tired of intermitent electrical problems that turn out to just be a fuse that needs a little TLC.
Thanks guys, as always. The car's looking pretty good I think and I might get around to posting some pictures of my engine and my new paint.
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1978 924
My car - a hole in my driveway where all my paychecks go... |
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N-Dub
Joined: 16 Jan 2006
Posts: 219
Location: Salt Lake City, Utah
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| Posted: Mon Jun 19, 2006 3:18 pm Post subject: |
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Fuses are at Autozone. $1.38 for 5. Bullet type. WHite fuses are 8 volts, red are 16. I just replaced some.
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'79 924 now Totaled! Carrera GT bodywork for sale!
'87 951 |
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timstar92404
Joined: 22 Sep 2004
Posts: 2075
Location: richmond BC
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| Posted: Mon Jun 19, 2006 7:55 pm Post subject: |
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the 2 wires that plug into the fan motor may have corroded connectors/ or ripped wires. just pull the wires out of the motor , cut the connectors off buy 2 new female connectors and solder them on and then plug them back in. I bet that's the problem. Also do the same thing with the wires to the temp sensor on the radiator.
take a can of electrical connector cleaner and open the plastic lid of the fusebox and soak the fuses and connectors with it, it'll remove dirt, oil etc.
obviously make sure the batter is disconnected and then leave it to completely evaporate before reconnecting the battery or else you'll set yourself on fire.
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78 924 sold.
85.5 944 |
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Peter_in_AU
Joined: 29 Jul 2001
Posts: 2745
Location: Sydney, Australia
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| Posted: Mon Jun 19, 2006 8:24 pm Post subject: Re: more electrical questions |
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| jopather wrote: |
Finally, those stupid fuses - is there any sort of replacement for those things? They get corroded so quickly. I'm getting tired of intermitent electrical problems that turn out to just be a fuse that needs a little TLC. |
You mean apart from a 6 inch nail? 
Nothing I've heard about. You can replace fuses with "trip switch" things like the overload switches in your house fusebox but from what I've read about them the current in most "older" car's wiring is so "dirty" the things will trip on transients that would not bother a standard fuse.
If you are having corrosion problems it might be worthwhile cleaning up the fuses and the contacts and then squirting everything with an electrolube product that is designed to protect metal from corrosion but still allow electrical current to pass. Many brands available at your local electronics store.
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1979 924 (Gone to a better place)
1974 Lotus 7 S4 "Big Valve" Twin-cam (waiting)
1982 924 (As featured on Wikipedia)
Learn to love your multimeter and may the search be with you |
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John Brown
Joined: 07 Nov 2002
Posts: 903
Location: Leesburg VA
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| Posted: Mon Jun 19, 2006 10:19 pm Post subject: Re: more electrical questions |
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| jopather wrote: | | ... Finally, those stupid fuses - is there any sort of replacement for those things? They get corroded so quickly. I'm getting tired of intermitent electrical problems that turn out to just be a fuse that needs a little TLC... |
Not directly. The old assemblies develope corrosion internaly and at the rivets. But, if you are talented in this area rip out aux fuse box and replace with a couple of aftermarket fuse blocks for the blade style fuses. About $10 each. The main fuse box would be much more difficult due to the numerous internal wiring connections; but you could do individual circuits or if ambitious the whole thing.
A big candidate for the treatment is the fuel pump circuit.
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John
80 931 - #931 44Cup
99 Escalade - tows track cars
gone but not forgotten: original 924.org car - 82 |
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Smoothie
Joined: 01 Jan 2003
Posts: 8032
Location: DE (the one near MD, PA, NJ)
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| Posted: Tue Jun 20, 2006 12:28 am Post subject: Re: more electrical questions |
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| jopather wrote: | First question is an "identification" question - does anyone know what the little box with three spade lugs on it is that is tucked up underneath the dash over on the passenger wall? I haven't found any reference to it in my manual or any of the schematics...
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Sounds like a relay to me. The only ones in the general area you mentioned are for AC and are accessible with the glovebox removed - there should be 2 in there to the right (if you have AC). The only other relays under the dash that aren't on the fuse-relay board are normally clipped to the left side of the HVAC box - one for power windows and the other for the radio. If it's not one of the AC relays, I'd guess it was something added by a previous owner.
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"..it's made in Germany. You know the Germans always make good stuff."
'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox |
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jopather
Joined: 16 Jun 2005
Posts: 58
Location: California
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| Posted: Tue Jun 20, 2006 3:35 am Post subject: thanks |
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Thanks guys - I do have an aftermarket AC system that will hopefully work when I get the blower motor going, so it must be an AC relay.
I'm tossing around the idea of making a custom board that would plug into my fuse block and let me put standard automotive fuses in it, we'll see how much time I decide I have.
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1978 924
My car - a hole in my driveway where all my paychecks go... |
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Stampedetrail
Joined: 29 May 2005
Posts: 274
Location: Fairbanks, Alaska
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| Posted: Tue Jun 20, 2006 6:21 pm Post subject: |
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You could try testing the blower motor with a charger? Eliminate that as a failure point, then find the electrical problem.
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1977.5 924 "Martini" head / New Old Stock rebuild
1985.5 944 Why? Because I can. |
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jopather
Joined: 16 Jun 2005
Posts: 58
Location: California
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| Posted: Wed Jun 21, 2006 12:16 am Post subject: maybe a silly question |
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Ok, I spent an hour last night after work trying to find my blower motor - any tips? All I can figure is that it's in the plastic looking box under my glove box, but if that's the case, how do I get it out of there? I'm so tired of spending money on this thing I really don't want to break something I shouldn't and have to go pull it out of a junker.
Thanks
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1978 924
My car - a hole in my driveway where all my paychecks go... |
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Stampedetrail
Joined: 29 May 2005
Posts: 274
Location: Fairbanks, Alaska
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| Posted: Wed Jun 21, 2006 8:15 pm Post subject: |
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Go in through the hood. There's a cover over the blower motor that should snake around to the battery tray & enter the passenger side foot well. You should be able to get access to the motor if you remove this.
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1977.5 924 "Martini" head / New Old Stock rebuild
1985.5 944 Why? Because I can. |
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D Hook
Joined: 02 Nov 2002
Posts: 3158
Location: Omaha, NE
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| Posted: Wed Jun 21, 2006 9:36 pm Post subject: |
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| Stampedetrail wrote: | | Go in through the hood. There's a cover over the blower motor that should snake around to the battery tray & enter the passenger side foot well. You should be able to get access to the motor if you remove this. |
HUH?
Which blower motor are you talking about?
You're right; there is a blower under the dash on the passenger side that can be accessed by pulling the kick panel off, IIRC.
The other blower is mounted up top of the center of the firewall. This one is for the heater.
Which one are you having trouble with? You can probably test both of them in the car without pulling anything out.
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'80 924 n/a SOLD |
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jopather
Joined: 16 Jun 2005
Posts: 58
Location: California
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| Posted: Thu Jun 22, 2006 12:24 am Post subject: |
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Uh oh.. two blowers? Now I'm in trouble. I'm not sure which one it is. In my car (a '7 I have a switch up above my console beside two vents. It has a slider for "cooler", and it has a switch with positions 0-4. That used to turn on a blower, now it doesn't. Like I said, I checked the switch. Which blower does that run?
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1978 924
My car - a hole in my driveway where all my paychecks go... |
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Paul
Joined: 02 Nov 2002
Posts: 9491
Location: Southeast Wisconsin
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| Posted: Thu Jun 22, 2006 8:55 am Post subject: |
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The A/C blower which is under the dash in the passenger's footwell.
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White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy. |
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