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Old 06-17-2010, 11:19 AM
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454 chevy electrical gauge problem

I Have A 454 Chevy In A Street Rod And Here Is The Problem. I Installed A Stewart Warner Elect Temp Gauge That Reads 00-240 Degrees. After All Installations Were Complete I Test Drove And The Temp Gauge Goes To 240 Degrees. The Car Is Not Running Hot Not Boiling Over And It Starts Fine. I Replaced The Entire Unit And Guess What The Same Problem. Checked All Grounding And Wiring And All Is Ok. I Hooked Up A Mechanical Gauge And It Reads At Running Speed Between195-205 Degrees. Also Got A Radiator Cap With Gauge And It Reads 200 Degrees After Running. Was Advised By Stewart That It Was A Grounding Problem, Which It Is Not. As Far As Sw Is Concerned Tough . The Sw Temp Gauge Is 30 Degrees Off. Any Ideas, I Think I Have Done All Possible And Don't Want To Install A Mechanical Gauge As That Would Require A Large Hole In My Firewall. Any Help Would Be Good.
Carey

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Old 06-17-2010, 11:34 AM
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I've seen problems when teflon tape was used, it insulated the sender.
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Old 06-17-2010, 11:52 AM
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454 chevy

No Tape Used. I Even Hooked Up Outside The Car Using Seperate Hot And Ground Wire, Still Reads 240.
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Old 06-18-2010, 03:43 PM
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454 chevy

Well I Tried A Couple Of New Things Regarding My Heat Gauge Problem:
1) Removed The 180 Thermostat
2) Put A Small Amount Of Teflon Tape At The Base Of Sending Unit.
Guess What , Just Got Back From A 10 Mile Test Run With Speeds From 30 To 70 Mph And The Temp Gauge Never Went Over 200 Degrees. I Also Had The Radiator Cap Gauge On And It Was Within 5 Degrees Of Temp. Gauge. So Maybe The Car God's Are Smiling On Me.
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Old 06-18-2010, 05:37 PM
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So, are you saying the thermostat was the cause of the gage reading 30 off? And now you are going to run the engine w/o a thermostat so your temp gage will work?
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Old 06-18-2010, 08:40 PM
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The Only Thing I Can Figure Out Is With The High Output Water Pump It Can't Force Enough Water Through The Therm. Opening. As For Running A Car Without A Therm. It Would Only Cause It Longer To Warm Up For Heat.i Also Set The Extra Fan To Run More. Just Got Back From Test 2 And Spent Time In Stop And Go Traffic And It Never Got Past 210 And As Soon As I Got Moving The Temp Went Back Down.
So There You Have It. Will Leave For Tennessee Next Week.
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Old 06-19-2010, 07:53 AM
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Might be that the sender had an air bubble trapped under it before you removed the thermostat.

Just a thought...
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Old 06-19-2010, 08:48 AM
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Joe G No Air Bubbles In The Entire System. I Even Bled All The Lines. So I Will Proceed With What I Have Now. As Far As Stewart Warner Gauges I Will Replace All Of Them With A Different Brand Due To The Lack Of Support From Them And I Think There Products In The Past Few Years Are Not Up To There Old Standards,
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