Bruce:
You were dead on with the troubleshooting methods.
I disconnected the wire at the sender and the gauge read
cold. Touching the wire to ground pegged the needle to
hot. So it sounds like I need a new sending unit. The
hard part will be finding one. The part number is 1513210.
It seems as if this part was only used on the GMC V8. The
GMC and Chevy 6s and Chevy V8 used a mechanical water temp
gauge instead of electric.
I've checked LMC, Brothers and Heavy Chevy catalogs
with no luck. I'll call a few others today and see if they
have the sending unit.
Any ole truckers have an old GMC V8 gathering dust
that still has a water temp sending unit in the intake
manifold? What do you want for it?
-----Original Message-----
From: B&A Kettunen [mailto:bekett@uslink.net]
Sent: Tuesday, July 11, 2000 10:51 PM
To: oletrucks@autox.team.net
Subject: Re: [oletrucks] Temp gauge problems
Don't know about that particular one, but most GM products back then should
be pretty much the same.
First, rule out a stuck open thermostat.
If you disconnect the wire from the sender, the guage should read full
cold. Ground the wire from the sender and the guage should read full hot.
If it doesn't read full hot, there is something wrong with the wire from
the guage to the sender. If the guage always stays low, and shorting the
wire shows full hot, there is something wrong with the sender. Check that
there is no sealing compound interfering with the ground of the sender to
the engine. If this doesn't do it, replace the sender.
Blessing every minute I spent with my dad working on these things when they
weren't such oletrucks.
Bruce Kettunen
57 3200
Mt. Iron, MN
>The water temp gauge in my 57 GMC truck (stock 347" Pontiac
>V8) has recently started reading very low. The wiring from
>gauge to sending unit checked OK with a meter and the gauge
>is receiving the proper +12VDC on the upstream side. The
>gauge does move up slightly as the engine heats up, but
>never exceeds 140 degrees. I really doubt the engine is
>running that cool as the air temp here today is above 95.
>
>I do not know if the problem lies with the gauge or sender.
>The sender in my truck is GM part # 1513210. It was used
>on all V8 trucks from 55-59. Any of you have one that you
>want to get rid of?
>
>Any of you ever troubleshot this circuit with a meter? If so,
>what should the resistance of the sender be when cold? Hot?
>oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
|