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I'm going insane. Overheating again.

Discussion in 'Stock 1995 - 2001 Explorers' started by NickRT, August 16, 2018.

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    1. koda2000

      koda2000 Explorer Addict

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      I had a SOHC Expl that would push lots of coolant into the overflow tank once in a while. I knew it had a head gasket exhaust leak, because it would blow bubbles into the overflow tank. I found that if I let the engine warm up idling in my driveway it would fill up the overflow tank and overheat. If I just jumped in, started the engine and drove off it would be fine, never overheating or filling the overflow tank with coolant. I guess heating my engine up quickly blocked off the head gasket leak with the metal parts expanding where allowing it to warm up slowly while idling allowed exhaust to displace the coolant and push it out.

      Anyway, my point is have you considered that you might have a head gasket problem? You've pretty much changed everything else. I was just thinking maybe you had a sticking t-stat, but I re-read your thread and you say you've changed it twice already. What brand of t-stat did you install? I had a problem with aftermarket t-stat and returned if you a Motorcraft.

      Other than my above thoughts, I'm stumped.
       
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    3. donalds

      donalds Elite Explorer

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      Don't you say them dirty things like head gasket



      To be honest I have read a lot of threads about this problem . Pressure test
      Try k seal
       
    4. RandomNerd2000

      RandomNerd2000 Well-Known Member

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      Just dump some K-Seal in, I got my 01 Eddie Bauer with a head gasket leak I wasn't aware of, it'd BUST thermostat housings, I dumped K-Seal in first day and it lasted 12K miles and then it ran a tiny bit warm and then wouldn't stop overheating, then it all made sense. Give K-Seal a shot.
       
    5. imp

      imp Elite Explorer

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      @NickRT
      Get a "coolant tank" sniffer which sucks in a bit of the vapor above the coolant in either the catch bottle, or radiator neck. If combustion gas is present in the coolant, the sniffer will identify that.

      Then, it's time to accept the unbearable! imp
       
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    6. koda2000

      koda2000 Explorer Addict

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      I'm a big fan of using K-Seal for the timing cover gasket leak on the 5.0L and other small coolant leaks, but it won't work if you have an exhaust leak into the cooling system due to a blown head gasket because cylinder compression is 150-160 PSI and your cooling system pressure is only around 15-16 PSI at best, so there's no way the sealant is going to get pushed into the head gasket.

      One way it might work is if you can determine which cylinder is the culprit and you remove the spark plug, disconnect the fuel injector and run the engine with the plug out. That way the sealant might get into the gasket and seal the leak, but that's just a "maybe" and IDK that K-Seal would be the best choice for that Hail Mary.
       
    7. RandomNerd2000

      RandomNerd2000 Well-Known Member

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      My leak was an exhaust leak though, it'd blow visible bubbles in the radiator once it finally gave completely out.
       
    8. imp

      imp Elite Explorer

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      @RandomNerd2000
      Exhaust leak is a combustion leak, right? Your exhaust leak was exiting where, do you know? An exhaust leak can occur in a bunch of places: at the pipe to manifold, at the manifold gasket of one cylinder, in the EGR system, between cylinder to cylinder in the case of a head gasket, head gasket leak to water jacket, head gasket leak to outside the engine, head gasket leak between two adjacent cylinders. imp
       
    9. massacre

      massacre Elite Explorer

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      Yeah but which of those locations blow bubbles in coolant?
       
    10. roscoe 0202

      roscoe 0202 Elite Explorer

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      if you think it is leaking in the combustion chamber get the engine warm pour in the k-seal put on the radiator cap let it build pressure then shut the engine off and let it work into the crack without all the combustion pressure pushing it back out
      roscoe
       
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    11. imp

      imp Elite Explorer

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      @massacre
      One of the common locations for combustion gases to be forced into the coolant jacket was a cracked valve seat, usually an exhaust valve seat. Today's engines have hard seat inserts, and I don't know if the same situation exists with them. A cracked seat meant throw away the head.

      Other locations, maybe more common, are cylinder head gasket, crack in cylinder wall. imp
       
    12. massacre

      massacre Elite Explorer

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      It was a rhetorical question.
      My heads were cracked between the valves, thanks for the info
       
    13. koda2000

      koda2000 Explorer Addict

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      @imp - I agree that cracked heads and valve seats are common paths for exhaust gas leaks into the cooling system, but you tend to see this more with cast iron engines (like the 4.0L OHV). The 4.0L SHOC being all aluminum, head gasket leaks are more often due to a warped head as a result of overheating. The OP has the SOHC engine, which has apparently overheated to some degree multiple times according to his on-going description of his issues. At this point IDK what his problem is, but it seems like he's addressed all the common part failures that lead to overheating (thermostat, radiator, water pump, hoses). I've been reading most threads posted to this forum since 2011 and I do not recall ever reading about a cracked head/valve seat on a SOHC engine. I'm not saying it can't happen, but if the OP's issue is due to exhaust gas leaking into the engine's cooling system I think it's more likely due to a warped head. JMO.
       
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    14. donalds

      donalds Elite Explorer

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      My shoc has a cast iron block aluminium heads

      20180227_134431.jpg
       
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    15. bigewalksalone

      bigewalksalone New Member

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      Man same problem here... Started with crack in radiator housing,changed out thermostat stuck
      and blew out top radiator hose,new trermostat gasketand it is still losing water somewhere??
       
    16. donalds

      donalds Elite Explorer

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      Look in the engine valley with a flashlight for coolant may be leaking from back of your thermostat housing
      Did you replace your radiator cap
       
    17. bigewalksalone

      bigewalksalone New Member

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      No have not changed radiator cap,good idea I'll try that next..
       
    18. imp

      imp Elite Explorer

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      @koda2000
      Know this is old, but, please keep in mind 160 psi cylinder pressure is DURING cranking. Running, combustion pressures run many hundreds of psi, often as high as 1000psi, and, those are HOT gases, not cold. In the big diesels, injectors (within combustion chamber, unlike our car engines) must "push" fuel in at way over 1500+ psi (instead of 40-60), sometimes over 2000, because cranking pressures are 800psi+ and combustion pressures may approach 2000. imp
       
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    19. koda2000

      koda2000 Explorer Addict

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      Good point IMP.
       
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    20. bigewalksalone

      bigewalksalone New Member

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      Yea I know it's not good . Hey I noticed today while filling the resorvior,I could smell
      gas in the resv. ??? what you think?
       
    21. RandomNerd2000

      RandomNerd2000 Well-Known Member

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      Gas in the resv? That's not good, head gasket or cracked head is my bet. Any time you have that or coolant in your oil, that's nothing good.
       
    22. koda2000

      koda2000 Explorer Addict

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      Head gasket, or cracked head.
       
    23. imp

      imp Elite Explorer

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      @bigewalksalone
      Bad news, sad to say..... imp
       
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    24. fast_dave

      fast_dave Elite Explorer

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      Advice for NickRT, the OP of this thread:

      Here's the pre-snoflake, old school, fan clutch test procedure ;-)

      Obtain a length of water pump hose and fold it over once.

      When the truck is warmed up and idling, CAREFULLY insert and jam the folded over end of the hose into the spinning fan.

      If the fan stops spinning - your fan clutch is bad.

      If the fan is able to overcome the resistance offered by the rubber hose and continue spinning, the fan clutch is good.

      Hope that helps -
       
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    25. koda2000

      koda2000 Explorer Addict

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      LOL... I suggested doing something like this several years ago and everyone thought I was insane.

      Shade Tree Forever!
       
    26. donalds

      donalds Elite Explorer

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      I use a news paper the Sunday paper yeeyee
       

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