500 engine overheating

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500, 472, 425, 368 Discussion, 500 engine overheating in Cadillac Engine Discussion; I have a 1972 Caddillac Eldorado convertible. Recently it has been overheating. It started this overheating after I replaced the ...
  1. #1
    1972caddy is offline Cadillac Owners Member
    Join Date
    Aug 2005

    Angry500 engine overheating

    I have a 1972 Caddillac Eldorado convertible. Recently it has been overheating. It started this overheating after I replaced the head gaskets and had the heads milled and a valve job done. I put it all together and retorqued the heads as specified. I had the carb rebuilt and installed that back on the engine. I put a new thermostat on it and checked the hoses for cracks and wears. I then drove it for like 10-15 minutes at around 50-60 mph and i believe it began overheating. I shut it off and popped the hood and I could hear water boiling in the hoses and it was spilling out of the overflow tank. I then thought it might be the radiator. I had that checked out and there was a very small hole in it and there was some junk in it so i had professionaly flushed out and had the small hole repaired. I then decided to install a new water pump before I put the radiator back in. I decided also to remove the thermostat in hope of that it might run cooler. Now when I drive it I can still water bubbling or something in the hoses and the pressure is good in the cooling system. The overflow tank did fill up some but it did not boil out or anything. The antifreeze level in the radiator seems to be okay and does not go down any. The oil looks good and I cannot smell any antifreeze coming from the exhaust. The temperature light does not go on, but i am guessing its not working. It has brand new spark plugs and wires. The only thing is the timing may be slightly off. It may be a little retarded but I dunno if that would be enough to make it overheat or not. The points i think need to be gapped appropriately. If anyone else has any other suggestions it would be much appreciated. Thanks

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  3. #2
    Colt D is offline Cadillac Owners Member
    Automobile(s): 1968 Deville Convertible
    Join Date
    Aug 2004
    Vegas Baby!

    Re: 500 engine overheating

    A couple of things:

    1. Retarded timing will make the car run hot, because the car has to work harder. Replace the points with a points eliminator or go with HEI. There are threads in this forum that discuss that in great detail. Then set the timing to specs.

    2. Running w/o a T-stat can make the car overheat because it 1) Will not allow the car to sufficiently warm up to run efficiently, thus work harder; and more importantly, 2) Will not restrict the flow causing the coolant to run through the radiator too quick to cool off sufficiently.

    If after getting the timing right and putting in a t-stat that works, if it still overheats, check this thread 472 Radiator Q. Then double check all the steps regarding the heads to make sure a water passage did not get blocked somehow. Also pressure test the cooling system to see if the Rad really got sealed. Loss of pressure will make the water boil. Good luck.

  4. #3
    deeman is offline Cadillac Owners Member
    Join Date
    Apr 2004

    SmileRe: 500 engine overheating

    As has been said here before Make sure your vacuum advance is functioning and make sure you are pulling a vacuum from your carb at idle.You might of used a different port than the original.Without this working properly your engine will overheat very quickly.You can watch the temp. guage increase like a speedometer when it is not working properly.There are many other things as well,if you do a little searching this was covered in great detail not long ago.

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  6. #4
    bigblockcaddy is offline Cadillac Owners Member
    Join Date
    Dec 2005

    Re: 500 engine overheating

    well one thing about cars that overheat is that it is only a limited amount of things that it can be and its not alot that will make your car overheat..is it leaking antifreeze???or no??cause yea u put in a water pump so thats good but maybe a cracked radiator or maybe some of the hoses are old and cracked and are leaking?one thing that was crazy when i got my 79 sedan deville i was driving to school and the water pump was totally out on it and spraying anti-freeze all over my engine..and the crazy thing is that it never once overheated on me..and still to this day it hasnt ...425 a good engine..but that 500 damn man BEAST!!

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