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Overheating

Thread in 'Help Forum' started by Apats77, Jan 9, 2020.

  1. Apats77

    Apats77 Member 1st Gen Owner 4 Wheel Drive V6 Engine

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    So. I flushed my radiator and notice it didn’t seem full at all. I filled it and bled it to what I thought was sufficient.

    I have a possible blown head gasket that is leaking gases into the coolant. I used Bars HG-1 as a bandage since the truck has 213k miles on it.

    I have an issue with the coolant res getting constant bubbles in while the engine is warm and pressure has built. I replaced the rad cap with a duralast cap and still have bubbles. I then replaced it with MC cap and no bubbles

    but at no point with any of the caps did the coolant in the res ever transfer back over to the radiator after the engine cooled. The radiator always had a small amount of fluid to be added.


    well today it overheated in traffic (250*) I shut it off and added a gallon of coolant and 1/2 gal of water as well as let it sit high idle (1600rpm) for a half hour. It continuously burped.

    It never overheated with the duralast cap that let it bubble constantly. So I’ve added coolant, burped it and put the duralast cap back on.

    What the actual F is going on.

    Typical idle temp is 185.
     
  2. EddieS'04

    EddieS'04 Well-Known Member 1st Gen Owner 2 Wheel Drive V6 Engine

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    Maybe, Tstat not opening all the way or fan clutch not working properly or Rad is partialy pluged and need new, or as you said head gasket. Do you have white smoke in the exhaust? That would be the sign of coolant in the compression of a cylinder.
    Do you have a check engine light on.?
     
  3. Apats77

    Apats77 Member 1st Gen Owner 4 Wheel Drive V6 Engine

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    I have an intermittent CEL but no stored codes and no white smoke. Fan seems to be working fine.

    But how does it manage to stay cool then all the sudden get hot?

    I guess I could do a new Tstat and housing. Zabtech has a metal one. Might as well attack the cheapest option first.
     
  4. Apats77

    Apats77 Member 1st Gen Owner 4 Wheel Drive V6 Engine

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    Update.
    Overheated to the point of boiling today. Burped it again and decided to try something different.

    I put a duralast rad cap on that I had been using before but switched to a motorcraft one because it was allowing bubbles from the rad to constantly go into the overflow tank.

    now it isn’t overheating anymore.

    my guess is that there is air getting in from somewhere either head gasket or thermostat housing and that inferior duralast cap is allowing it to bleed off the air.
     
  5. EddieS'04

    EddieS'04 Well-Known Member 1st Gen Owner 2 Wheel Drive V6 Engine

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    I had an issue about 5yrs ago. My T-stat was the intermentant problem. Around town at 40mph and idle, all was well. Sometimes on the highway at 70 to 80 mph it would start to over heat. I have a scangauge II. I bought a 180 t-stat that solved my problem. I live in TX.
    I tested the oem t-stat in boiling water. It was only opening 50%..
    Btw I test all my t-stats before installation. I got a burned with a bad new one yrs ago. I dont like doing things twice.
     
  6. Apats77

    Apats77 Member 1st Gen Owner 4 Wheel Drive V6 Engine

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    Interesting. I might just bite the bullet then and do the whole housing and stat with Austekks aluminum one. Just eliminate that all together. I wonder if the stat they send with it is OE temp? I’d like to go a step cooler with all the miles this thing has.
     
  7. Todd Z

    Todd Z Well-Known Member 2nd Gen Owner V6 Engine V8 Engine

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    OK,

    FIRST you need to do two things...... Compression test the motor Every cylinder....... THEN do a cooling system pressure test, WARM and cold.....

    Letting it get that hot is damaging the motor more and more every time !! The t stat is like $8 !!! that's a lot better then 80 for a housing and 4,000 for a motor !!
     
  8. Apats77

    Apats77 Member 1st Gen Owner 4 Wheel Drive V6 Engine

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    Well I have to replace the whole housing because one of the bolts broke free and just keeps spinning so that’s gunna get done either way.
    What will the compression test show?

    Also if the system is over pressurizing what is that caused by?
     
  9. Todd Z

    Todd Z Well-Known Member 2nd Gen Owner V6 Engine V8 Engine

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    Compression will show if you have a blown head gasket. That 170 PSI cylinder pressure will leak into the cooling system causing bubbles and other problems. You could have other things going on but the basic tests are needed prior to just throwing parts at it.
     
    EddieS'04 likes this.
  10. Apats77

    Apats77 Member 1st Gen Owner 4 Wheel Drive V6 Engine

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    Why does it not overheat at idle/high idle but it will driving around?

    that to me sounds like thermostat/water pump/restriction.
     
  11. EddieS'04

    EddieS'04 Well-Known Member 1st Gen Owner 2 Wheel Drive V6 Engine

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    Todd, is correct about the compression test. A leaking headgasket, will buble into the coolant.
    Also when you start over heating. Leave the motor running and check that the bottom rad hose, is not colapsed. If collapsed, that can indicate a t-stat restriction or a radiator restriction. Restricted flow will suck the inlet hose flat. That hose should have a wire coil in it. To prevent colapse. Some cheap replacement hoses, do not have the coil. Also, long term water or too much water over coolant. Will rust away the coil, long term. Motor cold cap off you should be able the feel the coil in the full lengt5h of the hose.

    But bubbling coolant is a sign of compresion into the coolant. And or air getting in somehow.
     

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