Temp gauge question.
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Temp gauge question. in Past Cadillac Vehicle Discussion; I just completed a round trip to Indianapolis motor speedway and back from Columbus Ohio, and when I pulled into ...
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    trailor's Avatar
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    Temp gauge question.

    I just completed a round trip to Indianapolis motor speedway and back from Columbus Ohio, and when I pulled into my driveway I noticed my temp gauge started to pass the the half way mark. Maybe running 210 if that's what above halfway would be. Should I be concerned?

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    Ranger's Avatar
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    Re: Temp guage question.

    210 is normal operating temperature. If it just slightly and temporarily passed 12:00 I wouldn't worry.
    Attached Images

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    trailor's Avatar
    trailor is offline Cadillac Owners Fanatic
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    Whew. It's time for a oil change again anyways so I will ask the guys to check every thing out. It was more about 215 and definitely not near 230. That's a great picture. That's the first time it has creeped that high since I've owned the car and its the 3rd or 4th trip long distance, 366 miles to the tank. Just want to be careful.

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    Re: Temp guage question.

    My '97 had the digi dash so I was able to monitor coolant temps and it ran a consistent 205 (Summer) - 215 (Winter). I have only seen the gauge on my '03 move off of 12:00 once, but as I said, I wouldn't loose any sleep over it.

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    Awesome Ranger. Then I won't lose any sleep tonight. Thanks fella. Trash this thread!!

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    Re: Temp guage question.

    Sleep tight. We'll leave the thread. It may help others in the future.

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    Re: Temp guage question.

    trailor, You might want to go to the Engines, Northstar Performance forum and read the 3 cooling system/gauge operation sticky posts.

    Also, go way up ^^^ in the top black bar and study the Cadillac Technical Archive. Most of that was written by one of the Northstar Powertrain design team engineers.

    Many pictures and diagrams of your cooling system and other parts in my albums - the Community tab, Albums, the red Seville. 2 albums, 6 pages of stuff.

    Click on those obscure tabs in this entire site - you might be amazed to find out what's stored in here.

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    c_d
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    Re: Temp guage question.

    A $16 peace-of-mind solution may also be to operate a bluetooth OBD2 reader with Torque Pro on an Android phone/tablet. The combination of both enables you to constantly monitor the sensors and spout an alarm whenever a fault code is found or one of your alert thresholds has been passed. The dongles start below $10 but when you are concerned about your battery go with at least version 1.4 or 2.0 of the ELM327 chips (almost all of the cheaper modules are based on the ELM chips), because they support a "sleep mode" and do not munch away your battery when not in operation.

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    Re: Temp guage question.

    Yeh a smidge off 12 is normal it does that in really hot driving or idling about a half inch or so

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    Re: Temp guage question.

    Another trick, easy to mount and see in real time, is a ScanGauge-II. It plugs into the OBD-II port, has a 6-foot cable, and you can set it up to watch 4 of 12 "gauges" - sensor readouts - in real time on a screen. A CF member in Annapolis turned me onto the thing 6 years ago - now have one in the car and both trucks.

    I monitor Intake Air Temp, Ignition Advance, MAP, and Coolant Temp. The thing is also a fuel calculator and trouble code scanner with a "Ready/Not ready' readout. www.scangauge.com

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    trailor's Avatar
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    Bringing this back up. My temp gauge has been running more towards the 1 o'clock mark during normal and slight traffic. And the other night, during a bad accident with stop traffic, like dead stop for about and hour, it almost went to 2 I clock. I would turn the fan speed up and it would bounce down and once I got back to full speed on the highway, it went to normal 12 o'clock. The weather here has been 60s and down to the low 40s so I don't know if that has any to do with it. Also, should I check my coolant and see if I need some? No warning lights have never came on for low coolant or anything. Just worries me. I'm about to have my first child and now having to replace both front wheel bearings($3,000 in repairs since July), a head gasket failure would not be good.

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    Re: Temp gauge question.

    Something doesn't sound right (unless you have a more sensitive gauge). Temp increase at idle is normal, but these gauges are so dumbed down that mine will idle all day long at 12:00.

    You should check your coolant level every once in a while just out of habit.

  14. #13
    trailor's Avatar
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    It only happened with I was dead stopped in bumper to bumper traffic. I was reading the technical archive and my car should be checked for a coolant flush. It sounds like you really have to try and ruin these head gaskets. Since my car does have 124k miles, will doing a coolant flush do more damage or should I do it as soon as possible?

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    Re: Temp gauge question.

    No need to flush anything but the toilet. Just drain and refill 50/50 Dex/distilled water ever 2-3 years.

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    trailor's Avatar
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    Ok. I will do that. I've owned it for two years now. I will report back tomorrow or later this week about what I find. Well definitely tomorrow about checking it. What are these GM tablets I read about for coolant? And also, check the coolant when the engine is cold?

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