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Engine overheating.... Sometimes

Discussion in 'General Tech and Maintenance' started by scottp11, Sep 12, 2007.

  1. scottp11

    scottp11 The Seniorest Member....

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    I have a 93 civic hatch with a JDM B16A swap. Just recently, within the past 2 weeks, my car has started to overheat. The gauge climbs up to about 3/4 high, and will go back down eventually. Sometimes downshifting helps. It does it everytime I drive longer than 5 minutes, but not so much at slower speeds.

    I have a Koyo aluminum radiator (brand new), just flushed the coolant and replaced with new, Flex-a-lite slim fan, which is coming on, Samco hoses, fairly new thermostat.

    Thanks for everyone's help in advance. I really need to get this figured out before my engine blows.... :(
     
  2. scottp11

    scottp11 The Seniorest Member....

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    Anyone?
     
  3. eg6sir

    eg6sir Supa Mod Moderator VIP

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    is this an aftermarket gauge or stock
     
  4. eg6sir

    eg6sir Supa Mod Moderator VIP

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    the reason i ask is because i had the same problem when i was using an Autometer water temp gauge.. i didnt use the sender that came with it, i just spliced it into the stock temp sensor.. i replace my radiator and thermostat and it still did it... once i got a gauge cluster that had a working temp gauge it read normal while the other was up to hot.. it had me trippin all the time
     
  5. MoSeS

    MoSeS New Member

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    yeah im with eg6sir, it sounds like an electrical problem to me
     
  6. scottp11

    scottp11 The Seniorest Member....

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    I got the JDM EG6 guage cluster. I've had it for over a year. It worked perfectly, no overheating issues until just about 1 1/2 to 2 weeks ago. Is there a way to test it, to see if it is the guage cluster? Buy an external temp guage?

    BTW, thanks for the responses, I need to get this figured out.
     
    Last edited: Sep 13, 2007
  7. eg6sir

    eg6sir Supa Mod Moderator VIP

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    try replacing the temp sensor.. it may have gone bad..
     
  8. scottp11

    scottp11 The Seniorest Member....

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    So if the temp sensor is bad, my car is not really overheating, right? Just the sensor is bad. I hope that's the case.
     
  9. eg6sir

    eg6sir Supa Mod Moderator VIP

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    if its not working properly it may send out the wrong signal saying you're running hot.. thats the only thing i can think of why it would do it out of nowhere since you've covered everything else that would cause it

    only other thing i can think of is the headgasket..
     
  10. K2e2vin

    K2e2vin Senior Member

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    Try bleeding the coolant.
     
  11. eg6sir

    eg6sir Supa Mod Moderator VIP

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    :ph34r:
     
  12. scottp11

    scottp11 The Seniorest Member....

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    I hope it's not the water pump also. What are some symptoms of a faulty water pump? Wouldn't it run hot all the time? And the gauge never goes all the way to the top, just about 3/4 the way, then back down.

    Yeah, I just flushed the coolant and replaced with new coolant. 50/50 pre-mixed.
     
  13. K2e2vin

    K2e2vin Senior Member

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    Hey, could've forgot to bleed it. My mom's Concorde did the same thing after a new coolant bottle, thermostats and flush was done. Turns out it was just a air pocket.
     
  14. scottp11

    scottp11 The Seniorest Member....

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    How do you bleed it?
     
  15. phyregod

    phyregod !!YTINASNI

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    Should be a little bleeder valve where the upper radiator hose enters the engine. idle the engine to operating temperature and unscrew that valve, bleed the air out of the system. Use caution though, it'll be spewing hot coolant, too.

    Also, make sure the fan is spinning the correct direction.
     
  16. phyregod

    phyregod !!YTINASNI

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    Naa, bad water pump loses water from the system. Honda water pumps cannot fail except for the seal around the shaft. There is a "weep hole" on your water pump. If coolant is coming out, it needs to be replaced.

    Sounds like you need to get a chilton! (or a haynes if chilton is absolutely unavailable.)
     
  17. Cashizslick

    Cashizslick !i!i!i!i!i!i!i!i!i!i!i!

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    Why not run a "breather tank"?
     
  18. scottp11

    scottp11 The Seniorest Member....

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    I have both, but have never had problems with overheating before this. But yeah, I'll check that bleeder valve thing tonight when I get off work. Thanks for your help.
     
  19. scottp11

    scottp11 The Seniorest Member....

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    Well, I'm replacing that coolant temp sensor right now. I got it off a 99 Civic Si head, that never had any overheating issues, so.... I'll find out if that's the problem. I gotta wait till the engine cools down a little bit more.

    I can't find the "bleeder valve" you're talking about. I looked at both head's (mine and the 99 Si) and don't see any valves in that area.
     
  20. FObangah

    FObangah New Member

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    The bleeder valve is right were the upper rad. hose meets the engine. It looks like a large brake caliper bleeder. It points directly up at the hood. I'm with K2e2vin, He said the temp drops when he down shifts, the higher revolutions will make the water pump turn faster and flow a little harder, forcing the air pockets through the system. He doesn't know where the bleeder is which means he deffenitly did not bleed it. I'd bleed it first..sice that won't cost you anything but time... then see if the needle stops dancing around.

    If that doesn't work.... check for coolant seepage around the timing cover seals lie PHYERGOD said.... a bad seal on the water pump could cuase these same symptoms.
     
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