4.5 Cooling System Woes...
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HT4100 4.1, 4.5, 4.9 Discussion, 4.5 Cooling System Woes... in Cadillac Engine Technical Discussion; Hey guys, I have a question about my 89 Eldo... My car will run at 180 degrees all day on ...
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    DrCheeto's Avatar
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    4.5 Cooling System Woes...

    Hey guys, I have a question about my 89 Eldo...


    My car will run at 180 degrees all day on the highway... If i get OFF the highway, It slowly climbs, i've seen it go as high as 225... I know that it is really this high, i used a real temp gauge to verify the accuracy..

    I know 225 isn't technically "overheating", but it scares me. I just replaced the thermostat, radiator cap, flushed the system and it still does the same thing...

    Is this normal? Am I worrying myself? or is there something else I should check..

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    noahsdad's Avatar
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    Re: 4.5 Cooling System Woes...

    Have you checked to see if the cooling fans are working? The module that controls them is a pretty common failure item on these years of Cads. Try turning on the A/C when the engine is warm - both fans should run.

    Also check trouble codes, be watching for an F41.

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    DrCheeto's Avatar
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    Re: 4.5 Cooling System Woes...

    My fans work fine, I usually drive around with the a/c on anyway... Today i drove around and the highest i saw was 213...

    I know its not crazy hot, but it still worries me and i want to get to the bottom of this.

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    HUF
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    Re: 4.5 Cooling System Woes...

    It might be fine. When you get off the highway and stop by a lite in the summer time the temp. will go up really fast. The fans should strat at about 225 and bring it down to 212.

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    Re: 4.5 Cooling System Woes...

    Quote Originally Posted by HUF View Post
    It might be fine. When you get off the highway and stop by a lite in the summer time the temp. will go up really fast. The fans should strat at about 225 and bring it down to 212.
    Here's what gets me though.. I drive around with the a/c on, and both fans are running.. I still see it get up to 225 sometimes...

  7. #6
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    HUF
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    Re: 4.5 Cooling System Woes...

    Quote Originally Posted by DrCheeto View Post
    Here's what gets me though.. I drive around with the a/c on, and both fans are running.. I still see it get up to 225 sometimes...
    Can't comment on this one...my AC has been out from the day one ( I bought it used).

  8. #7
    snydly402 is offline Cadillac Owners Member
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    Re: 4.5 Cooling System Woes...

    check the a/c condensor to see of the cooling fins are blocked with bugs and gravel, those are common causes and if they are go to a car wash or in your driveway with the engine cold open the hood and spray water from inside the engine compartment outward to clean it off,

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