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#1
08-06-2001, 10:38 PM
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I installed an after market temp gauge on my 66 Tempest w/ a 64 326 V8. I replaced the sensor and installed the gauge correctly per the directions. The temp gauge reads 230-235 degrees once the car is warmed up!
My guess is that the gauge is not correct for the following reasons: I stuck a instant read meat themometer in the radiator just below the water inlet, and it reads 160 degrees, which is the same as thermostat that I recently installed. Also, when I turned on the heater full blast, the temp gauge didn't budge, still read 230 degrees - if the radiator was clogged, or had poor flow, I would expect the temp to drop. Is using an instant read meat themometer a good way to double check the gauge's accuracy? |
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#2
08-06-2001, 10:38 PM
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I installed an after market temp gauge on my 66 Tempest w/ a 64 326 V8. I replaced the sensor and installed the gauge correctly per the directions. The temp gauge reads 230-235 degrees once the car is warmed up!
My guess is that the gauge is not correct for the following reasons: I stuck a instant read meat themometer in the radiator just below the water inlet, and it reads 160 degrees, which is the same as thermostat that I recently installed. Also, when I turned on the heater full blast, the temp gauge didn't budge, still read 230 degrees - if the radiator was clogged, or had poor flow, I would expect the temp to drop. Is using an instant read meat themometer a good way to double check the gauge's accuracy? |
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#3
08-06-2001, 11:08 PM
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Instant read meat thermometer...
Insteent red moat thirmomotor... Instep rod met thirdmember... (Gach trying to type that 3 times, real fast)
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Just a blind squirrel looking for a nut. |
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#4
08-11-2001, 01:44 PM
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You can check temp with a thermometer in the radiator. Also if you have an ohm meter check the restance of the new sensor vs an old one. New one could be bad. The 81 TA project I'm working on used a entirely different range temp sensor than my 78 car, Year One has them listed as all the same.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune [email protected] 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs 1964 Corvette Coupe 327 4 speed |
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#5
08-11-2001, 01:58 PM
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I personally like mechanical gauges better. Have you compared your gauge w/a mechanical gauge? Otherwise what Skip said, you may have bad/wrong sensor. Not too sure 'bout the meat thermometer thing
Be Cool  (literally), Guy
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#6
08-11-2001, 09:32 PM
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I put a little short dial indicator thermometer in the extra hole left where the thermoswitch used to be on my crossover for monitoring the temp during cam break-in way back, but after I put it in I decided I liked having a mechanical under the hood to back up the dash unit so I left it. It looks good too. I get lots of compliments from other car guys about how neat an Idea it is to have it there incase there is some doudt about the dash gage. this has a very short bulb and has 1/2"pipe threads screwed right in. I highly reccamend it!
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#7
08-14-2001, 04:20 PM
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Thanks for all of the advise. I just purchased a mechanical gauge and will install it today. I've already installed a 160 degree thermostat and upper radiator hose. Along with the new gauge, am also replacing the H20 pump, back flush it, and replace the lower radiator hose. I'm driving from Chi-town to Mo-town for the Dreamcruise, and figure this is cheap insurance, especially w/ wife and dogs in tow.
Anyone else attending? |
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#8
08-14-2001, 06:03 PM
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When you installed your electric gauge, did you use teflon tape to seal the threads? This can cause a ground problem. Also, where did you get your 12-volt reference source? Anyway, no sense troubleshooting it now that you are going with the mechanical gauge.
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#9
07-27-2006, 11:55 AM
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bringing this post back to life
I have the exact same problem...
In reading another post, it looks like this '70 owner also had this issue and 'fixed' it by sticking a resistor in line w/ his sensor http://forums.maxperformanceinc.com/...emp+sensor+ohm Two questions, does anybody know any sort of base resistance for the temperture sensors (80 ohms at 190?) and second has anybody had a real fix to this issue other then use a mechanical sensor or haphazardly stick a resistor in line w/ the temp gauge until you're happy? Aaron |
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#10
07-27-2006, 12:03 PM
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What brand of gauge did you buy and did it come with a sensor or was it purchased separately?
If they match, and you used Teflon tape, the sensor may not be grounding well. George |
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#11
07-27-2006, 12:22 PM
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its a set of gauges off another pontiac I actually have to sets so i could try my other set and see if it works better but i'd like to avoid pulling my dash again.
The sensor is the AC delco part they call out for a 70 gto (don't make the 3 prong sensor anymore). I just put the sensor in, no tape. Aaron |
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#12
07-27-2006, 12:27 PM
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If the gauge and connections are ok, then the sender is probably the wrong one for the application.
Unfortunately, in the older service manuals like my '67, there are no specs for the resistance values for the sender. George |
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#13
07-27-2006, 12:56 PM
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I agree w/ you. Not having the 3 prong sensor makes me suspicions but everything i look up seems to think you can use the same sensor for 64-72 gtos.
That's the main reason i'm not convinced that sticking a resistor in the circuit would work. Anyone have any experiance w/ what sending unit would work better? Aaron |
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