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Cadillac Seville / Cadillac Eldorado Forum Discussion, Hot Northstar - Please help ! in Past Cadillac Vehicle Discussion; What kind of noise ,I hear this noise kinda like a worn bearing coming from the water pump area its ...
  1. #61
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    What kind of noise ,I hear this noise kinda like a worn bearing coming from the water pump area its not super loud but can hear it when the hood is up, maybe that is the normal operation idk.

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    Is it possible for the thermostat to start sticking sometimes but not stuck?

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    Re: hott northstar helpppppp!!!!!!!!

    99.99% of the time a thermostat fails shut - while open they operate against some pretty heavy spring pressure, so it's almost impossible for one to "stick open".

    Use the pics and illustrations in my albums to learn the normal coolant flow through the system, then borrow or buy an IR temperature gun - Radio Shack or large auto parts store - you don't need the fanciest model - the basic gun will do just fine. Now start the car from cold and watch various parts of the system warm up. When the temp at the heater return hose on the water pump cover reaches 188 the thermostat begins to open and radiator temp will begin to ease up. As system temp gets to 206 the thermostat is fully open and you should have about 206 everywhere - don't diss me for a 5 - 8 degree variation around the system - just get an idea of what the temps are and how they get there. If you don't turn on the A/C the engine and system will continue to warm slowly to 224, when the fans will go to SLOW, cool the system to 213 and shut off again. The cycle repeats.

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    Actually I made a mistake, It didn't go to the one o'clock position it went to 230 degrees which is the first tick past the middle.

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    Re: Hot Northstar - Please help !

    Quote Originally Posted by sts 03 View Post
    Actually I made a mistake, It didn't go to the one o'clock position it went to 230 degrees which is the first tick past the middle.
    My gauge picture is of the 2000 and later Seville/Deville 180 degree sweep "gauge". Earlier models and Eldorado have a 135 degree sweep gauge but the tick marks represent the same temperature notation as in the picture.

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    Yeah I got confused I thought the first tick was one o'clock but according to the pic one o'clock is past the first tic.my car went up to the first tic which is 230 degrees, so 230 isn't anything to worry about right?

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    Re: Hot Northstar - Please help !

    230 is not critical, but well above the normal operating temperature. I'd be concerned and keep a close watch on it.

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    I am it will be in the upper 90's starting tomorrow so we'll see what happens.what's normal 200 -220?

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    Re: Hot Northstar - Please help !

    205-215 from my experience. My '97 had a digidash so I could get readout. I ran 205 (summer) to 215 (winter, below zero temps, but usually around 210).

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    Re: Hot Northstar - Please help !

    Quote Originally Posted by sts 03 View Post
    I am it will be in the upper 90's starting tomorrow so we'll see what happens.what's normal 200 -220?
    Ambient temperature has little or no bearing on what constant temp the engine runs at - the thermostat does. The engine will run at about 200 or so in DC in August, Saudi Arabia in July, or Alaska in January (it will take a while longer to warm up there, though).

    "Normal" on your car is with the gauge needle exactly at 12 o'clock: That covers from 188 to about 210 degrees. Stuck in traffic with no A/C on, it will head for the first tick past 12 o'clock, fans will go to SLOW and the temp will come back to close to 12 o'clock. That's "Normal" too. With A/C on, fans run in slow all the time, so the gauge needle should sit at just about 12 o'clock, maybe one hair past. That's "Normal" too.

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    So the car should run cooler with the a/c on?

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    Re: Hot Northstar - Please help !

    Probably not. Remember, the fans are on to pull air through the condenser (which is in front of the radiator) in order to cool the refrigerant. The heat that is transferred from the refrigerant must now pass through the radiator to further cool the coolant.

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    Re: Hot Northstar - Please help !

    Quote Originally Posted by sts 03 View Post
    So the car should run cooler with the a/c on?
    I didn't say that.

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    With a/c on the fans run all of the time and the needle should stay around 12 maybe a hair past with AC off in traffic the needle can climb to the first tick then the fans kick on so the temps can go back down.so that sounds like to me if I keep the AC on which keeps the fans on the needle will stay at 12 maybe a hair past.

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    Re: Hot Northstar - Please help !

    Quote Originally Posted by sts 03 View Post
    With a/c on the fans run all of the time and the needle should stay around 12 maybe a hair past with AC off in traffic the needle can climb to the first tick then the fans kick on so the temps can go back down.so that sounds like to me if I keep the AC on which keeps the fans on the needle will stay at 12 maybe a hair past.
    Correct, but that is not normal. It should stay at 12:00 with or without the A/C on.

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