overheating

Discussion in '80-Series Tech' started by trojan_knight, Nov 5, 2005.

  1. trojan_knight

    trojan_knight

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    has any body had an intermitent overheating problem '94 1fz w/ 180k mi. i have installed a new rad. cap and thermostat, but the problem still happens. :mad: i havent noticed anything odd, no loss of power or compression, no smoke and no milkshake for oil. i am thinking bad water pump or plugged radiator.
     
  2. Beowulf

    Beowulf

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    Trojan,

    There are many very complete threads discussing overheating issues. A clogged radiator is one of the common problems. We haven't seen many bad water pumps but there have been a couple. A lot more clogged rads though. Another common problem is a bad fan clutch.

    Do yourself a favor and search the archives just so you have all the information on tackling this problem. It could be any number of things from a simple stuck thermostat to a cracked head (see Doug's current thread.) You will want to check all the components in the cooling system before you start throwing parts at it.

    Other factors that we need to know to help diagnose is when does it overheat? Speed?? Terrain?? towing?? and anything else you can think of that will help us help you.

    -B-
     
  3. LandCruiserPhil

    LandCruiserPhil Peter Pan Syndrome Supporting Vendor

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    If your w/p was bad or you had a plugged rad, chances are your overheating would not be intermittent.

    Spend $20 and send a sample of your oil to Blackstone lab and get piece of mind.

    Note: A head gasket can be leaking without showing the signs you noted above.
     
  4. trojan_knight

    trojan_knight

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    i have an electric fan that is working. can these plastic tanked rads. be rodded?
    phil do you have an address for blackstone?
    overheating only happens in town not on the freeway
    thanks
     
  5. CruisinGA

    CruisinGA

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    Rodding these radiators is not a great idea except maybe as a spare...

    There is a high probability that the radiator will leak after it is done...

    If the radiator is suspect, your best bet is a new one.
     
  6. Beowulf

    Beowulf

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    Is this in addition to the stock fan?

    -B-
     
  7. Tools R Us

    Tools R Us

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    Supercharger or any other mods? Fan clutch good?
     
  8. LandCruiserPhil

    LandCruiserPhil Peter Pan Syndrome Supporting Vendor

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    http://www.blackstone-labs.com/





    .
     
  9. powderpig

    powderpig SILVER Star

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    in town slow speed and not on the highway, sound like the fan clutch is not kicking in when the radiator is hot. It sounds like you need a new fan clutch. later robbie
     
  10. trojan_knight

    trojan_knight

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    i dont have a mechanical fan just dual 12" electrics in an alumunum shroud. 3in side dump exhaust ( i love this state no emisions) alcohol/water injection@ full throttle. thank for the input
     
  11. Tools R Us

    Tools R Us

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    That's probably your problem, the electric fans will not pull enough air.
     
  12. trojan_knight

    trojan_knight

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    i found the problem! the thermostatic switch went out and the fans wenrent working at all. new 180 degree switch problem solved.
     
  13. Beowulf

    Beowulf

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    It took you 16 days to realize the electric fans were not turning? :rolleyes:

    -B-
     
  14. trojan_knight

    trojan_knight

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    no this was the fist i had to test the switch and update thread. i had hard wired the solenoid to come on with the ignition
     
  15. IdahoDoug

    IdahoDoug

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    If someone converted the truck to electric fans to overcome an overheating problem, then you'd better fix THAT problem as well. Overheating in Wyoming in November?? I agree with Kevin - those fans are not going to move enough air to keep this engine cool under much load in summer. Personally, I'd convert it back to the mechanical fan.

    DougM
     
  16. trojan_knight

    trojan_knight

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    we have been having a weird winter we got snow just a couple of weeks ago. this is the first time i have ever had a problem with the fans and now that they are working right again the problem went away.

    thanks for all the help
     
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