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73-87 Chevy _ GMC Trucks => Interior & Equipment => Instrumentation => Topic started by: Skunksmash on July 22, 2008, 10:40:52 pm

Title: Heat gauge does not work. Where is the wire?
Post by: Skunksmash on July 22, 2008, 10:40:52 pm

In my 87 Silverado, the heat gauge does not work. Now, i have identified what could be the problem. There is no wire going to the sensor in the cylinder head. HA! Anyway, the only thing is, i can not find that little wire! can someone maybe post a pic of where it comes out of the firewall, or wiring harness? Also, is that the only sensor for heat? What is that little sensor at the very front of the top intake manifold? It looks very similar to the heat sensor in the side of the cylinder head.

Title: Re: Heat gauge does not work. Where is the wire?
Post by: VileZambonie on July 23, 2008, 04:52:42 am

The temp sending unit wire breaks out of the harness near the lh side top of the engine. The sensor in the intake manifold is the engine coolant temp sensor for the ECM

Title: Re: Heat gauge does not work. Where is the wire?
Post by: Skunksmash on July 23, 2008, 05:39:08 am

Left hand. Thats as if you were facing the engine compartment from the front of the vehicle, correct? So it kinda has to run across back behind the distributor? I ask cause i can not seem to find the wire.


Are there any after market heat gauges that come with a new wire just in case the wire is gone?

Title: Re: Heat gauge does not work. Where is the wire?
Post by: ccz145a on July 23, 2008, 05:54:23 am

Left as in sitting in the cab. Directions are always in relation to the driver sitting in the driver's seat.

Title: Re: Heat gauge does not work. Where is the wire?
Post by: Skunksmash on July 23, 2008, 12:26:18 pm

Thats why i usually say driver or passenger side. Helps clear up any confusion.

Title: Re: Heat gauge does not work. Where is the wire?
Post by: VileZambonie on July 23, 2008, 03:46:49 pm

Drivers side is the LEFT hand side. Passenger side is the RIGHT hand side.

Title: Re: Heat gauge does not work. Where is the wire?
Post by: ccz145a on July 23, 2008, 04:37:12 pm

I prefer PORT and STARBOARD myself ;D

Title: Re: Heat gauge does not work. Where is the wire?
Post by: Skunksmash on July 25, 2008, 04:32:34 am

I am starting to think my wire may be missing. Would someone be so kind as to post a pic of exactly where it comes out at? I cant seem to find it anywhere.

Title: Re: Heat gauge does not work. Where is the wire?
Post by: Skunksmash on July 27, 2008, 11:22:34 pm

Sorry if this shows up two times, but i guess i messed it up on my last try. I would like to BUMP this up for my last question. I need to get that guage working.

Title: Re: Heat gauge does not work. Where is the wire?
Post by: DnStClr on July 30, 2008, 07:36:13 pm

I think you should be looking for a dark green colored wire.

Title: Re: Heat gauge does not work. Where is the wire?
Post by: ccz145a on July 31, 2008, 07:46:05 am

dark green and either 16GA or 18GA (thin). Of course it's never that easy, my temp wire in my 75 has a white asbestos wrapping.

Title: Re: Heat gauge does not work. Where is the wire?
Post by: DnStClr on August 01, 2008, 12:40:38 pm

Here's some pics- the wire goes down along the lower side of the L/H head..
(http://i227.photobucket.com/albums/dd22/Dnstclr/87redchevycarrieisthebombdiggity029.jpg)

(http://i227.photobucket.com/albums/dd22/Dnstclr/87redchevycarrieisthebombdiggity028.jpg)

It comes out of the harness behind the master cylinder at the left side of it-
(http://i227.photobucket.com/albums/dd22/Dnstclr/87redchevycarrieisthebombdiggity030.jpg)

Title: Re: Heat gauge does not work. Where is the wire?
Post by: Skunksmash on August 07, 2008, 10:26:18 pm

Dang the photos got deleted before i got to see them. Anyone got any other photos?

Title: Re: Heat gauge does not work. Where is the wire?
Post by: DnStClr on August 19, 2008, 12:15:39 am

Wow, I don't know how the pics got removed Skunkmash. But anyway, the green wire from the temp sensor in the head (near the 2nd spark plug on the driver's side of the engine) travels down the side of the block toward the rear of the engine and joins a wire bundle there. The wire's dark green.