500, 472, 425, 368 Discussion, Which temp is normal for a 500? in Cadillac Engine Discussion; ...
- 07-18-05 04:57 AM #1
Which temp is normal for a 500?
I've got a 500 in my -68 SDV, it´s 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.
- 07-18-05 04:17 PM #2Cadillac Owners Member
- Join Date
- Apr 2004
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.