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  1. #1
    Sr. Apprentice
    Join Date
    Jul 2006
    Location
    Spokane, WA
    Posts
    42

    Default Coolant temperature on a 94 454 [Expired Topic]

    Hi everybody.
    I just bought a 94 2500 4x4 with a 454. Although it looks like new and the previous owner had it maintained at the dealership, I noticed the coolant fluid was really dirty. So I flushed and rinsed the system 5 times with water and coolant flush. Unfortunately it still running a bit hot, the gauge goes up to the last mark before the 210 mark in normal driving conditions without towing. Is this maybe normal or should I check out the radiator itself?

  2. #2

    Default

    Hi Andy, I spent the years between 1980 and 1987 in Spokane!

    Anyhow, how many miles on that 94?

    Steve
    10 Chevy Traverse LT AWD
    02 Chevy Trailblazer LS (110K+ miles - loaded except for 4WD - WRECKED!)
    99 Chevy Cavalier LS (105K+ miles - commuter car)
    78 Chevy Suburban Silverado (454, 3/4 ton)
    62 GMC 3/4 ton Pickup (350 police interceptor)

    Remember: Search Before Posting | Fill out Your Profile & Signature
    * I've been saying for years that I was going to change my username, and I finally did.

  3. #3
    Sr. Apprentice
    Join Date
    Jul 2006
    Location
    Spokane, WA
    Posts
    42

    Default

    Hi, it has 157000 on it.
    What a small world! Originally I'm from Germany and moved to the US in 2000.
    Andy
    Spokane, WA
    1994 Chevy Suburban K2500 7.4 4WD

  4. #4

    Default

    Does the coolant still look brown?

    If so you may have a bad head gasket or intake gasket.

    If not then a clogged radiator is possible, or not.

    Have you tried changing the thermostat yet?
    It may be sticking.

    Technology is great, when it Works,
    And one Big Pain in the Ass When it Doesn’t.
    Detroit Iron Rules, All the Rest are Just Toys.
    94 GMC Burban, 5.7L (350), 4X4, Auto
    86 GMC Burban, 350, 2 WD, Auto
    79 GMC pickup plow truck, 400, Full time 4X4, Auto
    86 Pontiac Fiero SE, 2.8L, Auto, only mid engine American car
    See a Pattern yet?

    15 year GM assembly line worker.

  5. #5

    Default Coolant Temperature in Your '94

    Andy-----I too am a new owner to a used Suburban only it is a '95 2500 4x4 with a high mileage 454 engine. Unless someone corrects me, I believe your temp is normal at 209 degrees. Mine runs exactly the same as does my friend's '95 of same configuration. It is even more normal when you consider the "red" area of the temp gauge is at 260 degrees. Does anyone have the factory specs applicable to this issue?????

    Pete

  6. #6

    Default

    210 is just fine. most new cars dont kick on the electric fans until 225-230 degrees. the thermostat on your burb should open at 195 degrees and getting up to 220- 230 degrees would be acceptable on hot days or when towing up hill.

  7. #7
    Sr. Apprentice
    Join Date
    Jul 2006
    Location
    Spokane, WA
    Posts
    42

    Default

    well.. in the end I had to replace the radiator. It was shooting fluid all the way to the firewall....at least it never overheated.

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