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CompTruck
Joined: Mon Sep 21, 2009 11:30 pm Posts: 299 Location: brisbane northside
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 Posted: Wed Nov 16, 2011 5:14 am |
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hi mates. habing a problem with my sierra. had a problem with it heating up so then got radiator flushed and seemed to be good. then went out for a day and was fine. then it sat for a few hours then on my way home it started heating up again 
so i got a new radiator and am still having the same problem. it heats up driving around the streets to about 3/4 temp. would go higher i rekn too.
when i got home i let it idle for a while and it seems that if i switch the thermo off the temp start to drop straight away. then if i turn it back on it goes up again. so wierd
i had the fan on a rx7 and had the same problem with it heating up with the wires hooked up one way. reversing them fixed it on that car ( i think anyway. was a while ago) but it doesnt do it on the sierra unfortunatly.
any ideas what i can do to get it fixed with the current setup? i wil change to a normal fan setup if i cant make this work
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royce
omnipotent being
Joined: Sun Jun 11, 2006 11:30 pm Posts: 17216 Location: Pluto
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Posted: Wed Nov 16, 2011 5:18 am |
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run a fat wire from teh firewall to teh battery negative terminal, make sure the cable from teh block to the battery is tight and clean
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CompTruck
Joined: Mon Sep 21, 2009 11:30 pm Posts: 299 Location: brisbane northside
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Posted: Wed Nov 16, 2011 6:24 am |
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what wil that do exactly? lol
i ask because it has a wire from the firewall that used to go to the battery but now i dont hook it up. haha
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LAY80N
Joined: Tue Jul 28, 2009 11:30 pm Posts: 455 Location: Newcastle NSW
Vehicle: I drive your mum
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Posted: Wed Nov 16, 2011 6:26 am |
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Have you confirmed that the motor is acutally heating up, or is the temp gauge playing up. As Royce said, check your body/chassis earths and beef up your body earth from the fire wall to the Neg. terminal on the battery. Temp gauge rising is pretty comon when electrical load is placed on sierra electrics with poor earthing.
In regard to fan placement, the fan should suck air through the radiator core, so should be placed behind the core sucking air from the cooler side over the core. Sounds like you had your RX7 wired to blow/suck hot engine bay air over the core to try to cool it 
Layto....
Last edited by LAY80N on Wed Nov 16, 2011 6:29 am, edited 1 time in total.
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LAY80N
Joined: Tue Jul 28, 2009 11:30 pm Posts: 455 Location: Newcastle NSW
Vehicle: I drive your mum
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Posted: Wed Nov 16, 2011 6:27 am |
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CompTruck wrote: what wil that do exactly? lol
i ask because it has a wire from the firewall that used to go to the battery but now i dont hook it up. haha
Hahaha, so the wire that the factory electrical engineers decided was needed you left off
Layto....
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CompTruck
Joined: Mon Sep 21, 2009 11:30 pm Posts: 299 Location: brisbane northside
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Posted: Wed Nov 16, 2011 6:47 am |
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its a new temp sensor thing.
lol. i didnt know if that firewall wire was a "custom" mod or what. il try it now
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CompTruck
Joined: Mon Sep 21, 2009 11:30 pm Posts: 299 Location: brisbane northside
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Posted: Wed Nov 16, 2011 6:56 am |
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and i have noticed the switch for the fan inside the cabin gets abit hot after a few minutes. lol
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LAY80N
Joined: Tue Jul 28, 2009 11:30 pm Posts: 455 Location: Newcastle NSW
Vehicle: I drive your mum
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Posted: Wed Nov 16, 2011 7:06 am |
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New temp sensor or not, if the wiring isnt any good it wont do shit. Fix up the earths and see how you go. How do you have the fan wired. If its wired properly then the switch shouldnt get hot at all as its only carrying current to activate the relay.
Layto.....
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shakes
Joined: Sat Apr 10, 2010 11:30 pm Posts: 4895 Location: Northcote
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Posted: Wed Nov 16, 2011 7:10 am |
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LAY80N wrote: New temp sensor or not, if the wiring isnt any good it wont do shit. Fix up the earths and see how you go. How do you have the fan wired. If its wired properly then the switch shouldnt get hot at all as its only carrying current to activate the relay.
Layto.....
I'd take a punt there is no relay if the switch is getting hot... Then i'd guess the thermo isn't getting enough power to spin up properly?
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LAY80N
Joined: Tue Jul 28, 2009 11:30 pm Posts: 455 Location: Newcastle NSW
Vehicle: I drive your mum
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Posted: Wed Nov 16, 2011 7:19 am |
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shakes wrote: LAY80N wrote: New temp sensor or not, if the wiring isnt any good it wont do shit. Fix up the earths and see how you go. How do you have the fan wired. If its wired properly then the switch shouldnt get hot at all as its only carrying current to activate the relay.
Layto..... I'd take a punt there is no relay if the switch is getting hot... Then i'd guess the thermo isn't getting enough power to spin up properly? Thats what i was thinking too.
Layto....
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CompTruck
Joined: Mon Sep 21, 2009 11:30 pm Posts: 299 Location: brisbane northside
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Posted: Wed Nov 16, 2011 8:05 am |
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no relay i dont believe. just straight wires. has a fuse thing in the positive i think it is but. fan goes pretty fast. if i sit there with car off but fan on it spins faster if i push the clutch. pretty wierd
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sogone
az supporter
Joined: Mon Oct 25, 2010 11:29 am Posts: 2070 Location: Darwin
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Posted: Wed Nov 16, 2011 8:08 am |
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CompTruck
Joined: Mon Sep 21, 2009 11:30 pm Posts: 299 Location: brisbane northside
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Posted: Wed Nov 16, 2011 8:12 am |
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its not that funny
its how i got the car. i didnt do the custom install
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steak_knife
az supporter
Joined: Fri May 22, 2009 11:30 pm Posts: 21335 Location: Smart Ass Island
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Posted: Wed Nov 16, 2011 8:13 am |
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CompTruck wrote: no relay i dont believe. just straight wires. has a fuse thing in the positive i think it is but. fan goes pretty fast. if i sit there with car off but fan on it spins faster if i push the clutch. pretty wierd
Is your clutch cable hot????
_________________
I used to be indecisive,
now I'm not so sure.....
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LAY80N
Joined: Tue Jul 28, 2009 11:30 pm Posts: 455 Location: Newcastle NSW
Vehicle: I drive your mum
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Posted: Wed Nov 16, 2011 8:13 am |
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CompTruck wrote: no relay i dont believe. just straight wires. has a fuse thing in the positive i think it is but. fan goes pretty fast. if i sit there with car off but fan on it spins faster if i push the clutch. pretty wierd
The clutch cable/mechanism is probably provideing a better earth when you push it against the stop. SERIOUSLY check out your earths.
Layto....
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CompTruck
Joined: Mon Sep 21, 2009 11:30 pm Posts: 299 Location: brisbane northside
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Posted: Wed Nov 16, 2011 8:38 am |
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ah you guys are smart. il check tomorrow
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whincup
az supporter
Joined: Sat Apr 17, 2010 11:30 pm Posts: 1588 Location: Gracemere, QLD
Vehicle: '94 suzuki maruti
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Posted: Wed Nov 16, 2011 10:43 am |
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CompTruck wrote: no relay i dont believe. just straight wires. has a fuse thing in the positive i think it is but. fan goes pretty fast. if i sit there with car off but fan on it spins faster if i push the clutch. pretty wierd
yep. bad earth. mine did exactly the same thing... reason it does it when you push the clutch in, is because as your car is now it earths to the motor but not to the body. clutch cable joins the motor to the body. dont leave it too long, mine half melted my throttle cable when i started it. went to take off, throttle jammed on full on me. scared the shit out of me...
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CompTruck
Joined: Mon Sep 21, 2009 11:30 pm Posts: 299 Location: brisbane northside
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Posted: Wed Nov 16, 2011 10:46 am |
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oh no. better fix it before i use the car next
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CompTruck
Joined: Mon Sep 21, 2009 11:30 pm Posts: 299 Location: brisbane northside
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Posted: Sat Nov 19, 2011 2:04 pm |
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i believe its fixed now. still got up to about half but didnt have the up and down temp problem and the fan is goin fast the whole thime now.
i hooked up the firewall to battery earth.
and my clutch cable was full frayed apart and all popped out of the plastic casing. have a new one in now. didnt touch the main earth to engine block. only just hooked it up from puttin gthe motor back in so prety sure its good.
im going to say it was the clutch cable causing the problem and this would explain why it was fine for half the day then the problem occured. as the firewall to battery earth was off when the problem arose and was fine then problem started
so il say problem solvered. and i got an new radiator for good measure now lol
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steak_knife
az supporter
Joined: Fri May 22, 2009 11:30 pm Posts: 21335 Location: Smart Ass Island
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Posted: Sat Nov 19, 2011 6:49 pm |
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You clutch cable was acting as the main body earth, wasn't it's fault, it was just doing the job of the body earth you left off...
_________________
I used to be indecisive,
now I'm not so sure.....
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BlueSuzy
az supporter
Joined: Sun May 04, 2008 11:30 pm Posts: 9716 Location: NSW
Vehicle: SJ51 LWB, SJ70 SWB
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Posted: Sat Nov 19, 2011 6:55 pm |
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The clutch cable is not meant to be electrical! I have never seen an electrical clutch cable in a car..
_________________ BlueSuzy wrote: I'm over the G16b's.
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steak_knife
az supporter
Joined: Fri May 22, 2009 11:30 pm Posts: 21335 Location: Smart Ass Island
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Posted: Sat Nov 19, 2011 7:00 pm |
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BlueSuzy wrote: The clutch cable is not meant to be electrical! I have never seen an electrical clutch cable in a car..
I have, I've seen a accel cable glowing from the same thing.....
_________________
I used to be indecisive,
now I'm not so sure.....
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BlueSuzy
az supporter
Joined: Sun May 04, 2008 11:30 pm Posts: 9716 Location: NSW
Vehicle: SJ51 LWB, SJ70 SWB
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Posted: Sat Nov 19, 2011 7:04 pm |
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steak_knife wrote: BlueSuzy wrote: The clutch cable is not meant to be electrical! I have never seen an electrical clutch cable in a car.. I have, I've seen a accel cable glowing from the same thing..... 
Yes, But some accel cables are meant to be electric..They are wires though..Not cables. _________________ BlueSuzy wrote: I'm over the G16b's.
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steak_knife
az supporter
Joined: Fri May 22, 2009 11:30 pm Posts: 21335 Location: Smart Ass Island
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Posted: Sat Nov 19, 2011 7:11 pm |
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_________________
I used to be indecisive,
now I'm not so sure.....
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shakes
Joined: Sat Apr 10, 2010 11:30 pm Posts: 4895 Location: Northcote
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Posted: Sat Nov 19, 2011 8:02 pm |
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CompTruck wrote: i believe its fixed now. still got up to about half but didnt have the up and down temp problem and the fan is goin fast the whole thime now.
i hooked up the firewall to battery earth.
and my clutch cable was full frayed apart and all popped out of the plastic casing. have a new one in now. didnt touch the main earth to engine block. only just hooked it up from puttin gthe motor back in so prety sure its good.
im going to say it was the clutch cable causing the problem and this would explain why it was fine for half the day then the problem occured. as the firewall to battery earth was off when the problem arose and was fine then problem started
so il say problem solvered. and i got an new radiator for good measure now lol
Did you fit a relay to the circuit? and is the switch still getting hot?
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Damo
az supporter
Joined: Sat Jul 22, 2006 11:30 pm Posts: 4661 Location: Brisbane
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Posted: Sat Nov 19, 2011 8:37 pm |
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steak_knife wrote: :lol: Bit different.... fry by wire 
_________________
SJ50.4.LYF
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