Which temp is normal for a 500?
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500, 472, 425, 368 Discussion, Which temp is normal for a 500? in Cadillac Engine Technical Discussion; ...
  1. #1
    Pjotr's Avatar
    Pjotr is offline Cadillac Owners Member
    Automobile(s): Cadillac SDV 1968
    Join Date
    Jun 2004
    Location
    Sweden
    Posts
    45

    Which temp is normal for a 500?

    I've got a 500 in my -68 SDV, itīs in 188F when I drive and in 212F when I've been standing still on idle in 5-10 minutes. When I drive again it will be in 203F. And after awhile it's about 190-195F, is it ok? How high would it be without damage? I've got a new 180F therm and a new radiator cap, but I'm missing the radiator shroud. Just little worried for overheating at idle, when the car goes very slow. It's not boiling jet, but I can hear a "buzzering" sound somewhere when it's hot. The vacuum advance is ok.

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  3. #2
    kjc
    kjc is offline Cadillac Owners Member
    Join Date
    Apr 2004
    Location
    texas
    Posts
    26

    Re: Which temp is normal for a 500?

    Sounds good, really. The service manual for the '68 caddy says the thermostat was designed to open at 217 degrees coolant temperature. I wouldn't worry unless the temperature continues to rise after you start accelerating.

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