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Devil in My De Soto - over heat mystery

Discussion in 'The Hokey Ass Message Board' started by Skeezix, May 29, 2011.

  1. Skeezix
    Joined: Jan 10, 2007
    Posts: 840

    Skeezix
    Member
    from NorCal

    Gotta a stock 50 DeSoto flat heat six.

    New thermostat, new re done radiator, checked out the stupid coolant tube that doesn't want to come out but a fishing expedition with a long *** threaded rod revealed no rust evidence - block was boiled at last rebuild a few thousand miles ago. Water pump seems happy, no pee hole drip. Timing is set . Ran nice last week when ambient air temp was about the same - watched aftermarket gauge rise and thermostat open at around 180 life is good it's cruise time. Car sat two weeks - started yesterday and let her idle. Look at driveway and she's puking water like an over hear - sure an be gora she is at 220 ! Gasp
    So I'm guessing defective new thermostat - any other thoughts ?
    Thx


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  2. brad chevy
    Joined: Nov 22, 2009
    Posts: 2,627

    brad chevy
    Member

    Have you checked to see if the water is actually circulating when the thermostat opens? Could be a defective thermostat and a water pump doen"t always leak out the weep hole. Pull the thermostat out and see if theres anychange.With the thermostat out water should circulate if the pump hasn"t taken a ****.
     
  3. X2, water pump impeller may be spinning on the shaft
     
  4. Skeezix
    Joined: Jan 10, 2007
    Posts: 840

    Skeezix
    Member
    from NorCal

    Thanks - will yank therm o stat
    Also thought about an air pocket - any burp technique suggestions ?


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  5. american opel
    Joined: Dec 14, 2006
    Posts: 1,222

    american opel
    Member
    from ohio

    could be air.i have jacked the front of a car 2ft off the and let it run for 1/2 hour just to get the air out.you just have to make sure the top of the rad.is the highest part of the cooling system.on one car i put a flush valve it the heater hose just to bleed the air out.
     
  6. Skeezix
    Joined: Jan 10, 2007
    Posts: 840

    Skeezix
    Member
    from NorCal

  7. sololobo
    Joined: Aug 23, 2006
    Posts: 8,425

    sololobo
    Member

    Those beauties have a hidden devil in them all that name don't start with De by mistake. Fix it and drive "the hell" out of it. ~sololobo~
     
  8. sounds like it may be the ticket. but i would be checkin thermostat, they nearly always stick after they've overheated
     
  9. Skeezix
    Joined: Jan 10, 2007
    Posts: 840

    Skeezix
    Member
    from NorCal

    A new one though - Oy well parts ain't what they used to be I guess.


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  10. brad chevy
    Joined: Nov 22, 2009
    Posts: 2,627

    brad chevy
    Member

    New these days don"t make it good. Had a buddy buy a new water pump for Mopar 440,he put it on and car instantly got hot. Pulled the water pump and one side of the water outlet to the head wasn"t machined. My oldman always checked his thermostats before installing.
     
  11. handyandy289
    Joined: Sep 19, 2010
    Posts: 354

    handyandy289
    Member
    from Georgia

    When you buy new thermostat be sure to brush all of the rice off. It will stop up your radiator.
     
  12. Engine man
    Joined: Jan 30, 2011
    Posts: 3,480

    Engine man
    Member
    from Wisconsin

    I always drill a 3/16 hole in the thermostat to allow air to go through. In a non critical area of course. It won't allow enough water flow to cause a problem but it prevents the stat from being airlocked and not heating up.

    When I worked for a Ford dealer, the service manual advised heating the thermostat in water to open it and putting a piece of hard candy in it to hold it open to let air out. :rolleyes:
     
  13. Skeezix
    Joined: Jan 10, 2007
    Posts: 840

    Skeezix
    Member
    from NorCal

    Now that I read this I miss my old man - he told me the same thing and I forgot - thanks HAMBsters I'll give thermostat a test recheck the waterpump - say tuned


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  14. ClayMart
    Joined: Oct 26, 2007
    Posts: 7,799

    ClayMart
    Member

    Kind of forgotten about that tip. Also remember hearing about using an aspirin to temporarily hold the thermostat open. After the job is done then you can treat yourself to a piece of hard candy. :rolleyes:
     
  15. thermostat is not upside down ?
    hoses collapsing?
    bad rad cap ....

    start cold without cap idleing look for water movement in top of rad .. after 5 minutes of running a bad pump will have not moved the water thru the system and it will get hot a bad stat will also show signs of excess heat.l
    nothing?
    install cap and watch for temp to rise
    that car should have a low pressure cap below 10 lbs
     
  16. Skeezix
    Joined: Jan 10, 2007
    Posts: 840

    Skeezix
    Member
    from NorCal

    New cap hoses fine and not quite dumb enough to install inverted

    Thanks !


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  17. Did your T stat come wrapped in the plastic stuff on a little piece of cardboard of a rack in the autoparts store?

    Those stats are iffy at best. Pull the stat, throw it in a pot of boiling water and make sure it is opening. Or easier that that get the car up to heat then squeeze the top radiator hose and make the sure the stat is comming open.

    A few years back I started using fast actiing T stats, they are a performance stat. Many companies make them I have had pretty good luck with MR Gasket. Stant also makes them as well as Wieand etc. I even sue them in stock engiones that I am responsable for any more.

    They are a little pricey like up in the 7-10 buck range but they work and I haven't had any problems with one yet. Knock on wood.
     
    Last edited: May 31, 2011
  18. plym_46
    Joined: Sep 8, 2005
    Posts: 4,018

    plym_46
    Member
    from central NY

    Air in the system should not be a problem. Which byp*** system do you have internal or external??? This is externally evidenced by the thermostat housing. If it is a big cast iron piece with s ahort hose connecting it to the water pump it is an external system. If it has a pressed sheet metal outlet which only connects to the upper radiator hose it is an internal system. The gaskets and rear piece of the water pump must match the system.

    With the internal there is a slot in the backing plate and gasket that meet up with p***ages in the block near the water distribution tube. so the water pump and gasket must match up. the external system doesn not communicate with these p***ages.

    Also the water distribution tube does not really have a large effect on operating temp if its clear of crud. Its job is to direct coolant upwards to the valve seat area to provide cooling for the valves. Thats why the slots point up, and the tube is designed like a heating duct, in that it gets smaller as it gets further away from the pump. It keeps the velocity and quan***y of coolant equal alont th elenght of the tube.

    Also did you test your stat by placing it in a pan on the stove to see if it opens at the correct temp.

    See page 14 of the pamphlet in the attached link. Notice the gasket for the pump. it has a hole for the distribution tube, and a round hole. If you have the internal byp***, there needs to be a corresponding hole in the rear plate of the pump.

    the pump shown in the illustration is the external style. If you new pump backing plate doesn't match the old one switch them.

    http://www.imperialclub.com/Repair/Lit/Master/013/index.htm
     
  19. Frankie47
    Joined: Dec 20, 2008
    Posts: 1,877

    Frankie47
    Member
    from omaha ne.

    This is a non pressurized system.:)
     
  20. Skeezix
    Joined: Jan 10, 2007
    Posts: 840

    Skeezix
    Member
    from NorCal

    Based on the info above it's external
    Cast monster and lil hose

    It's a napa thermostat
    They had the gasket too
    As for water pump it was oe rebuilt a long time ago - I'll pull thermostat and boil it and I suspect the water pump could use an r/r - any suggestions on a rebuilder in SF bay Area ?


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  21. 8-9-duck
    Joined: Mar 25, 2008
    Posts: 63

    8-9-duck
    Member

    my chevy 6 tried to cook itself. i had the dizzy va***e line on the wrong carb port.
     
  22. Hang the stat froma wire so it is reading water temp not the"pan'temp

    oh ya i was not saying anything bout you... But making sure that the inverted stat was not an issue :)

    IS THERE A CHOKE STOVE ****ERFLY IN THE EXHAUST ?
     
  23. Xea
    Joined: May 6, 2007
    Posts: 59

    Xea
    Member

    There is a tube behind the water pump that can be clogged, if it is, you will never be able to get it to cool. It goes deep into the block and gets removed by a slide hammer. I just swapped engines in a 58 Plymouth and changed this in the new block to avoid troubles like this. I got my replacement at Vintage Power Wagons in Iowa. Check out there website and you can see one.
     
  24. Skeezix
    Joined: Jan 10, 2007
    Posts: 840

    Skeezix
    Member
    from NorCal

    Good point about the pan - and yes I am that dumb but I was careful


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  25. Skeezix
    Joined: Jan 10, 2007
    Posts: 840

    Skeezix
    Member
    from NorCal

    That was my original thought and they sell a tool to stick on your slide hammer specific to removing the tube but I was able to fish around in the tube the entire length and saw no signs of corrosion - I hope it's **** tstat or water pump - the idea of slamming out that tube - must remove grill some - doesn't appeal


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  26. Skeezix
    Joined: Jan 10, 2007
    Posts: 840

    Skeezix
    Member
    from NorCal

    ****er fly is loose - vac lines are in proper place


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  27. plym_46
    Joined: Sep 8, 2005
    Posts: 4,018

    plym_46
    Member
    from central NY

    did the timing slip to a more advanced postion of is the breaker plate stuck in the advaced position?
     
  28. Skeezix
    Joined: Jan 10, 2007
    Posts: 840

    Skeezix
    Member
    from NorCal

    Mmm good thought I'll double check - when I got the car back from my brothers estate it was way out...also he had -3 an line for vacuume


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  29. MedicCustoms
    Joined: Nov 24, 2008
    Posts: 1,094

    MedicCustoms
    Member

    I have alway drilled three or four hole in my stats just to make sure they flow. It helps get any air in the system out of the system. hope this helps
     
  30. Skeezix
    Joined: Jan 10, 2007
    Posts: 840

    Skeezix
    Member
    from NorCal

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