gauge help

bulachip · 05-11-2008, 11:58 AM

well i was trying to install a 160 theromostat and decided not to after talking to my brother who is against it. Anyway i must of screwed something up because now my temp gauge does not work. Also when I start the truck the fan runs even though the truck is cold. What is happening? Will the fan just continually run until I fix the gauge.

brad4eva · 05-11-2008, 03:29 PM

what type of vehicle? The vehicle's fan will run constantly anyways it sounds like your problem is your tempature sensor went out like 10 $

crabtruck · 05-12-2008, 02:08 AM

Not everyone can remember what everyone else is driving:
yr/make/model/eng/tran/etc ??

Is this the one ? 1989 1500 4x4 extended cab longbed 5.7tbi.
Is this GMC or chev ? Seems like there was some confusion...

bulachip · 05-12-2008, 08:03 AM

Sorry guys
It is a GMC 1989 4X4 extended cab longbed 5.7tbi.

Is it bad to drive it in the meantime.. I do not want it to overheat but at the same time the fan is running whenever the truck is on. Is it supposed to do this?

I should also mention that my oil pressure guage quit working as well

I did find a green wire under my hood that is severed. One end is connected to a white clip that has another wire in it and and connects to the fan. The other end of the severed green wire runs toward the firewall. It looks like the privious owner did something screwy here because there is another green wire that has what looks kind of like a small usb end to it?

When I connect the severed wire nothing happens.

When I connect the USB green wire to the bare green wire running towards the firewall nothing happens

When I sitck the bare Green wire that is attached to the white clip into the usb looking green wire the temp
guage reads max temp so it seems like my problem has something to do with this green wire.

What is this USB looking end supposed to connect to. Maybe it came unpluged and i just cannot find where it is supposed to be plugged. If I could replug it and then connect the severed green wire that could fix it!

I am not sure what wire controls the oil pressure guage.

bulachip · 05-13-2008, 07:31 AM

any ideas??

Chevy_Finatic79 · 05-13-2008, 07:40 AM

if it is just a single green wire it could either be for the temp sensor which is located on the side of the driver side head close to the spark pulgs OR it could be for your horn but more than likely it is for your temp sensor.

I would bet money there is no way your truck could overheat with a 160* thermostat from the factory they come with a 190*-195* so that means it is opening at 30* less of a temp than normal operation if anything your are overcooling your motor if there is such a thing

Chevy_Finatic79 · 05-13-2008, 07:47 AM

oh yea forgot to tell you for some strange reason when I put a 190 in my truck the temp gauge was reading like 210*-220* so I put in the 160* thermostat and the gauge read 190*-195* anything over 205* makes your oil break down in less than a month robbing it of its lubrication properties

bulachip · 05-13-2008, 11:01 AM

I am worried that because the temp guage is not working that the fan will not kick in. Should I be worried about that? That is why I am concerned about the overheating

bulachip · 05-14-2008, 08:54 AM

Perhaps there is no connection between the guage and the fan?

bulachip · 05-14-2008, 08:40 PM

i am going to take the truck on a long drive and need to know if it will overheat. the temp guage does not work. i need to know if this will prevent the rad fan from comming on

05-11-2008, 11:58 AM	#1
bulachip Full Member Join Date: Aug 2007 Posts: 33	gauge help well i was trying to install a 160 theromostat and decided not to after talking to my brother who is against it. Anyway i must of screwed something up because now my temp gauge does not work. Also when I start the truck the fan runs even though the truck is cold. What is happening? Will the fan just continually run until I fix the gauge.

05-13-2008, 07:40 AM	#6
Chevy_Finatic79 Senior Member Join Date: Mar 2008 Location: Lincoln NE Posts: 442	if it is just a single green wire it could either be for the temp sensor which is located on the side of the driver side head close to the spark pulgs OR it could be for your horn but more than likely it is for your temp sensor. I would bet money there is no way your truck could overheat with a 160* thermostat from the factory they come with a 190-195 so that means it is opening at 30* less of a temp than normal operation if anything your are overcooling your motor if there is such a thing __________________ "She's gonna Freak when she see's my wheels" 85' Chevy C-10 Longbox (Rat) TBI 5.7 Liter/THM350 90' Chevy Suburban 4x4 TBI 350 Cu.In./700R4 http://www.truckforum.org/forums/truck-pictures-176.htm

05-13-2008, 07:47 AM	#7
Chevy_Finatic79 Senior Member Join Date: Mar 2008 Location: Lincoln NE Posts: 442	oh yea forgot to tell you for some strange reason when I put a 190 in my truck the temp gauge was reading like 210-220 so I put in the 160* thermostat and the gauge read 190-195 anything over 205* makes your oil break down in less than a month robbing it of its lubrication properties __________________ "She's gonna Freak when she see's my wheels" 85' Chevy C-10 Longbox (Rat) TBI 5.7 Liter/THM350 90' Chevy Suburban 4x4 TBI 350 Cu.In./700R4 http://www.truckforum.org/forums/truck-pictures-176.htm

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05-11-2008, 03:29 PM	#2
brad4eva Senior Member Join Date: Apr 2008 Location: Tennessee Posts: 331	what type of vehicle? The vehicle's fan will run constantly anyways it sounds like your problem is your tempature sensor went out like 10 $

05-12-2008, 02:08 AM	#3
crabtruck Senior Member Join Date: Jul 2007 Posts: 1,474	Not everyone can remember what everyone else is driving: yr/make/model/eng/tran/etc ?? Is this the one ? 1989 1500 4x4 extended cab longbed 5.7tbi. Is this GMC or chev ? Seems like there was some confusion...

05-12-2008, 08:03 AM	#4
bulachip Full Member Join Date: Aug 2007 Posts: 33	Sorry guys It is a GMC 1989 4X4 extended cab longbed 5.7tbi. Is it bad to drive it in the meantime.. I do not want it to overheat but at the same time the fan is running whenever the truck is on. Is it supposed to do this? I should also mention that my oil pressure guage quit working as well I did find a green wire under my hood that is severed. One end is connected to a white clip that has another wire in it and and connects to the fan. The other end of the severed green wire runs toward the firewall. It looks like the privious owner did something screwy here because there is another green wire that has what looks kind of like a small usb end to it? When I connect the severed wire nothing happens. When I connect the USB green wire to the bare green wire running towards the firewall nothing happens When I sitck the bare Green wire that is attached to the white clip into the usb looking green wire the temp guage reads max temp so it seems like my problem has something to do with this green wire. What is this USB looking end supposed to connect to. Maybe it came unpluged and i just cannot find where it is supposed to be plugged. If I could replug it and then connect the severed green wire that could fix it! I am not sure what wire controls the oil pressure guage.

05-13-2008, 07:31 AM	#5
bulachip Full Member Join Date: Aug 2007 Posts: 33	any ideas??

05-13-2008, 11:01 AM	#8
bulachip Full Member Join Date: Aug 2007 Posts: 33	I am worried that because the temp guage is not working that the fan will not kick in. Should I be worried about that? That is why I am concerned about the overheating

05-14-2008, 08:54 AM	#9
bulachip Full Member Join Date: Aug 2007 Posts: 33	Perhaps there is no connection between the guage and the fan?

05-14-2008, 08:40 PM	#10
bulachip Full Member Join Date: Aug 2007 Posts: 33	i am going to take the truck on a long drive and need to know if it will overheat. the temp guage does not work. i need to know if this will prevent the rad fan from comming on