"Bad circulation"

Discussion in 'The Big Chill' started by TheCynic, Dec 6, 2019.

  1. TheCynic

    TheCynic Smack Talker

    Hey guys, back again with more newbie questions.

    Ive got a 67 Skylark w a 455 and its lately been running hot. Ive changed absolutely nothing on the vehicle and temps have been creeping higher and higher. The fan (not electric) needs a shroud, but id drive it for hours in Houston summers and its never gotten as hot as it has recently.

    I dropped by a local car meet the other night and another 455 owner more knowledgeable than myself took a look inside the radiator as i i let it run briefly and said although it looked good and clean inside it seemed i had bad circulation.

    My question is: whats the fix? New water pump? New radiator? Im assuming they're both "original" in that theyre old and ive never replaced them. I flushed the radiator and double checked the 190 mr gasket thermostat direction. Whats left?

    Thanks in advance.
  2. 12lives

    12lives Engage! - Jean-Luc Picard

    Could be timing. Could be thermostat. Could also be a dirty radiator. Do you use antifreeze? How old is the radiator? If you run the heater in the car does the engine temp go down?
  3. mikec

    mikec Well-Known Member

    I had similar problems and solved them with a bypass thermostat


    Block the bypass hose ports and every molecule of coolant now passes through the radiator. I live in Hotlanta and run ac and since I did this the coolant temp has never risen above 185f. It does take a bit longer for the engine to warm up though
  4. TheCynic

    TheCynic Smack Talker

    Timing shouldnt have changed cuz i havent messed w anything, unless it just... Changed on its own heh. Radiator age is unknown. But its one of the old bastards not a nice aluminum one. It flushed clean and looks clean inside, but.... Idk. The heater core is currently bypassed as well. There is a bit of anti freeze but not much currently
  5. TheCynic

    TheCynic Smack Talker

    This looks very similar to the Mr Gasket tstat im currently running... Well damn.
  6. telriv

    telriv Well-Known Member

    Sometimes by-passing the heater core only circulates coolant between the hoses. Try blocking off the outlets instead of using the hose as a bypass.
  7. Briz

    Briz Platinum Level Contributor

    How long has it been since you changed the fan clutch?
  8. TheCynic

    TheCynic Smack Talker

    I can, although the bypass had been in place for years before this issue persisted as well. Thanks
  9. TheCynic

    TheCynic Smack Talker

    I havent personally done it so i cant be sure. Ive owned the vehicle since 2014 but it had sat for some time while i sorted out previous electrical issues.
  10. Briz

    Briz Platinum Level Contributor

    Replace it. Riv started doin the same thing and that fixed it for awhile
  11. TheCynic

    TheCynic Smack Talker

    Fair enough. Thermal yeah? Anything else i had ought to know?

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