Is this temp gauge reading normal? see pic - Chevy Impala SS Forum
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post #1 of 20 (permalink) Old 06-03-2010, 06:10 PM Thread Starter
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Is this temp gauge reading normal? see pic

Driving down the road about 60-65 mph for 30 miles 84 degree day in Missouri. Is this what the gauge sould be reading or is it a little high!
96 Impala 117,000, k&n, 2 1/2" exhaust, 3.55 gears

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post #2 of 20 (permalink) Old 06-03-2010, 06:51 PM
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Are you running a stock PCM program? Also what's the temperature of the thermostat?

'96 - W/'96 9C1 Rear. Blah, Blah, Blah....

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post #3 of 20 (permalink) Old 06-03-2010, 06:55 PM Thread Starter
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Stock tune as far as i know, and new stock 180* stat
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post #4 of 20 (permalink) Old 06-03-2010, 07:06 PM
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Were you moving or sitting still when this picture was taken? Is the cooling system properly bled and have you checked the cooling fans for proper operation?

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post #5 of 20 (permalink) Old 06-03-2010, 07:16 PM Thread Starter
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I was moving 60-65, have bleed system several times. car was running hot, so I changed the T stat, no change, flushed the complete system, and bleed 6 times or so. had a cheapy pressure cap on it and it was boiling over after i would shut it off, so I bought a gm cap and put on today, then drove 33 miles home( highway). quit boiling over but temp runs where it is in pic after 20 miles or so, could it be plugged rad. just started doing this Monday
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post #6 of 20 (permalink) Old 06-03-2010, 07:19 PM Thread Starter
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have bled the car 6 or so times, when it gets fairly warm (towards halfway) i'll open bleeder and a little air comes out then straight fluid, so i shut and do it next time I drive it.
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post #7 of 20 (permalink) Old 06-03-2010, 07:39 PM
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You may still have some trapped air from the bad cap and the Tstat R&R. Warm it up, shut it off, let it sit a couple minutes, then pop open the bleeder screw.

Also, with the car running, disconnect the ECT sensor at the water pump to check your fans. Both should come on within 10 seconds or so, and both should move enough air to push firmly against your hand. If not, you've got a bad fan motor or relay.

2005 Pontiac GTO
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post #8 of 20 (permalink) Old 06-03-2010, 09:00 PM
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Yeah it certainly seems like it's running warm if you're seeing that temperature while driving.

I've installed a mechanical gauge in the cylinder head, and the F-Body 3 wire sender in the water pump. I can tell you that with both thermostats I've tried (160' & 180'), the operating temperature typically runs 12'-14' hotter than the thermostat rating temperature.

Looking at your gauge pic, I'd guess your seeing temps ~240', which is quite warm for a moving car.

FYI: Per the manual 2 of 2, page 6E-388

The PCM will command fan 1 ON at 107'C (225'F) and OFF at 103'C (218'F) and, fan 2 ON at 111'C (232'F) and OFF at 107'C (225'F)

'96 - W/'96 9C1 Rear. Blah, Blah, Blah....

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post #9 of 20 (permalink) Old 06-03-2010, 10:10 PM Thread Starter
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The gauge was showing almost that high when I got out to my dads shop earlier, and I raised it up on the lift to take off starter(it has been draging when hot for awhile now) I forgot to read the temp with the IR thermometer as soon as I shut it off, so it was about 10 min. after I shut it off and it 190* at the sensor on front of the wp, could my gauge be reading higher that it should? I'll have to wait till I get the starter back on to test the gauge with IR thermometer. It has quit bubbling and over flowing with the new cap. I also bled some more air out after I shut it off earlier.
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post #10 of 20 (permalink) Old 06-03-2010, 10:12 PM Thread Starter
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both fans do work like normal
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