| water temp sender [message #330469] |
Thu, 29 March 2018 13:26  |
joewilly
Messages: 40
Registered: April 2016
Location: Victor,Ia
Karma: -1
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Hello all ,
just got the GMC out of storage and noticed the temp gauge not coming up.
is there a way to test the water temp sender to see if it is working?
or a way to test the gauge?
my gauge ( not original ) comes up off of the low of 90 but only up to 100. so it is moving slightly.
thanks joe
Joe Williams
1978 Royale rear twin
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| Re: water temp sender [message #330472 is a reply to message #330469] |
Thu, 29 March 2018 14:40  |
77Royale
Messages: 461
Registered: June 2014
Location: Mid Michigan
Karma: 6
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Senior Member |
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Dont know of a good way to test that is accurate and reliable, but I would spring for a sender from Napa
Napa TS6469.
I forget the calibration but its better than the stock sender. If I recall the OEM sender when at Normal was a bit hot.
77 Royale, Rear Dry Bath. 403, 3.55 Final Drive, Lenzi goodies, Patterson carb and dizzy.
Mid Michigan
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| Re: [GMCnet] water temp sender [message #330474 is a reply to message #330472] |
Thu, 29 March 2018 15:24 |
powwerjon
Messages: 849
Registered: March 2013
Karma: -2
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Senior Member |
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Get the new sender, this info tell you all about the new sender.
http://gmcmotorhome.info/engine.html#sender
JR Wright
Michigan
> On Mar 29, 2018, at 12:40 PM, Wayne Rogewski wrote:
>
> Dont know of a good way to test that is accurate and reliable, but I would spring for a sender from Napa
>
> Napa TS6469.
>
> I forget the calibration but its better than the stock sender. If I recall the OEM sender when at Normal was a bit hot.
>
> --
> 77 Royale, Rear Dry Bath. 403, 3.55 Final Drive, Lenzi goodies, Patterson carb and dizzy.
> Mid Michigan
>
> _______________________________________________
> GMCnet mailing list
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| Re: [GMCnet] water temp sender [message #330475 is a reply to message #330472] |
Thu, 29 March 2018 16:17 |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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Senior Member |
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Temperature Sender for GMC Motorhome
This may be old news for most, but doesn't hurt to be told.
With the original temperature sender on all GMC Motorhome engines, the actual coolant temperature will be:
225 degrees at 1/4, 250 degrees at 1/2, 270 degrees at 3/4, and 280 degrees at H.
This has caused a lot of engine damage when engines start to overheat. Go to NAPA, buy and install a TS-6469 sender and the actual coolant temperature will be:
180 degrees at 1/4, 215 degrees at 1/2, 240 degrees at 3/4, and
255 degrees at H.
Since the standard pressure cap raises antifreeze solution boiling point to 250 degrees, this change will enable much more accurate readings. I don't know why they did this but it is a serious problem. Info is from GMC Motorhome News published by Cinnabar, Dec. '95 issue. I did this and it agrees exactly with my VIP digital readout.
________________________________
From: Gmclist on behalf of Wayne Rogewski
Sent: Thursday, March 29, 2018 14:40
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] water temp sender
Dont know of a good way to test that is accurate and reliable, but I would spring for a sender from Napa
Napa TS6469.
I forget the calibration but its better than the stock sender. If I recall the OEM sender when at Normal was a bit hot.
--
77 Royale, Rear Dry Bath. 403, 3.55 Final Drive, Lenzi goodies, Patterson carb and dizzy.
Mid Michigan
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| Re: [GMCnet] water temp sender [message #330476 is a reply to message #330474] |
Thu, 29 March 2018 16:26 |
joewilly
Messages: 40
Registered: April 2016
Location: Victor,Ia
Karma: -1
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Member |
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got one - thanks
NAPA guy told me to ground the wire from the gauge with key on and gauge should go up if it is working, It did so it's a bad sender.
Thanks again
Joe Williams
1978 Royale rear twin
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| Re: [GMCnet] water temp sender [message #330479 is a reply to message #330476] |
Thu, 29 March 2018 17:41 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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Senior Member |
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GMC senders use a 0 - 90 ohm range. A simple multimeter could test for that. The Napa sender is the solution. Less than $10, last time I chased one.
Tom
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: water temp sender [message #330485 is a reply to message #330469] |
Thu, 29 March 2018 21:20 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Before I went blaming the sender I would suspect the thermostat. I would still replace the sender to get the better range, but I suspect the thermostat is your issue.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] water temp sender [message #330487 is a reply to message #330485] |
Thu, 29 March 2018 23:13 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Get a laser temp gun, around $30.
This is a great tool to have to see what is happening.
This tool has helped to shown us what is happening.
On Thu, Mar 29, 2018 at 7:20 PM, Ken Burton wrote:
> Before I went blaming the sender I would suspect the thermostat. I would
> still replace the sender to get the better range, but I suspect the
> thermostat is your issue.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
>
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: water temp sender [message #330494 is a reply to message #330469] |
Fri, 30 March 2018 08:56 |
Chris Tyler
Messages: 458
Registered: September 2013
Location: Odessa FL
Karma: 7
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Senior Member |
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You might want to check the connnections at the sender. Since its been sitting, it may have corroded, which will definitely change the resistance.
76 Glenbrook
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