Temperature gauge shows hot, truck not - The 1947 - Present Chevrolet & GMC Truck Message Board Network

LawMan02 · 09-14-2006, 10:12 PM

I was ride around yesterday evening and looked down at the temperature gauge and it was pegged out as far as it could go to the hot side. Truck was running fine and showed no signs of overheating. I got home and shut the truck off and it stayed all the way over pass hot. I killed all the electrical current (main battery switch) and it never moved. Still that way this evening when I checked it and truck hadn't been run. All other gauges are working fine. Does anyone know what might have cause this and the fix? Thanks Randy

jsbgump · 09-14-2006, 10:17 PM

Check the wire going to your temp sender. It has probably feel against the exhaust or something

powell72 · 09-14-2006, 10:38 PM

If it's all the way pegged hot that means it's grounded out, follow the wire, you'll probably find the problem fairly easily.

LawMan02 · 09-14-2006, 10:51 PM

Thanks guys. I will check it out tomorrow. It had me worried that the gauge might be messing up but now it sounds like a possible easy fix.

Broken_down? · 09-15-2006, 02:22 AM

mine did that. wire had fused to manifold. rewired and never happened again.

byrd · 09-15-2006, 09:51 AM

Every now and then the resistor on the gauge goes bad and produces the same outcome.If the sending unit wire is not shorted out anywhere, the you should look at replacing the resistor.

67chevemall · 11-07-2006, 06:10 PM

Quote:

Originally Posted by byrd

Every now and then the resistor on the gauge goes bad and produces the same outcome.If the sending unit wire is not shorted out anywhere, the you should look at replacing the resistor.

That there is good to know.

shifty · 11-07-2006, 06:15 PM

It's possible the sending unit could be toast too, right?

67Fleet · 11-07-2006, 11:03 PM

Quote:

Originally Posted by shifty

It's possible the sending unit could be toast too, right?

I'd say the wire is grounding out also. I had that happen to me. When my sending unit went bad my temp gauge stayed cold and didn't move at all.

Richard H. · 11-07-2006, 11:29 PM

I have the same problem and mine is not shorted, where is the resistor you speak of?
Richard

byrd · 11-08-2006, 07:49 AM

on the back of the temp gauge. There will be a piece of wire mesh or porcelian between two of the studs, that is the resistor

67chevemall · 11-09-2006, 08:48 AM

Well I fixed mine. When switching over to 7 gauge dash I put the temp wire on the "now dead" oil (blue) line. oops.
Works good now thanks.

09-14-2006, 10:12 PM	#1
LawMan02 Junior Member Join Date: Nov 2005 Location: Saint Francisville, Louisiana Posts: 157	Temperature gauge shows hot, truck not I was ride around yesterday evening and looked down at the temperature gauge and it was pegged out as far as it could go to the hot side. Truck was running fine and showed no signs of overheating. I got home and shut the truck off and it stayed all the way over pass hot. I killed all the electrical current (main battery switch) and it never moved. Still that way this evening when I checked it and truck hadn't been run. All other gauges are working fine. Does anyone know what might have cause this and the fix? Thanks Randy __________________ 1972 GMC K2500, stepside, stock 350, 4 speed. Former F/D truck with 32,000 miles, no rust. 1973 Jeep CJ 5, 304, 33's with side pipes 2008 GMC 2500HD, CC, SWB, D/A, SLT

09-14-2006, 10:17 PM	#2
jsbgump Gone Fishing Join Date: Aug 2005 Location: Fort Worth, Texas 76135 Posts: 12,361	Re: Temperature gauge shows hot, truck not Check the wire going to your temp sender. It has probably feel against the exhaust or something __________________ 68 Chevy Short Fleetside LSX Swap Under Way 3.73 posi 2.5/4 drop Frame of resto has been started 2022 Hyundai Tucson Limited 2019 Chevy Traverse Redline Edition Wifes Ride Build Thread http://67-72chevytrucks.com/vboard/s...=1#post3483616

09-14-2006, 10:38 PM	#3
powell72 Senior Member Join Date: Jan 2005 Location: Loveland Co. Posts: 3,098	Re: Temperature gauge shows hot, truck not If it's all the way pegged hot that means it's grounded out, follow the wire, you'll probably find the problem fairly easily. __________________ Chris 74 Custom Deluxe SWB 350/350/3.73’s 99 2wd Silverado RCSB 5.3/4L60/3.90’s http://www.classictrucks.com/feature...short_bed.html

09-14-2006, 10:51 PM	#4
LawMan02 Junior Member Join Date: Nov 2005 Location: Saint Francisville, Louisiana Posts: 157	Re: Temperature gauge shows hot, truck not Thanks guys. I will check it out tomorrow. It had me worried that the gauge might be messing up but now it sounds like a possible easy fix. __________________ 1972 GMC K2500, stepside, stock 350, 4 speed. Former F/D truck with 32,000 miles, no rust. 1973 Jeep CJ 5, 304, 33's with side pipes 2008 GMC 2500HD, CC, SWB, D/A, SLT

11-07-2006, 06:15 PM	#8
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,373	Re: Temperature gauge shows hot, truck not It's possible the sending unit could be toast too, right? __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

11-07-2006, 11:29 PM	#10
Richard H. Spanked once Join Date: Oct 2006 Location: Intheshop, Indiana Posts: 969	Re: Temperature gauge shows hot, truck not I have the same problem and mine is not shorted, where is the resistor you speak of? Richard

11-09-2006, 08:48 AM	#12
67chevemall Registered User Join Date: Apr 2003 Location: NB Posts: 3,367	Re: Temperature gauge shows hot, truck not Well I fixed mine. When switching over to 7 gauge dash I put the temp wire on the "now dead" oil (blue) line. oops. Works good now thanks. __________________ 1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD

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